Mathias Abegg; Hyung Lee; Jason J S Barton Systematic diagonal and vertical errors in antisaccades and memory-guided saccades Journal Article Journal of Eye Movement Research, 3 (3), pp. 1–10, 2010. Abstract | Links | BibTeX @article{Abegg2010,
title = {Systematic diagonal and vertical errors in antisaccades and memory-guided saccades},
author = {Mathias Abegg and Hyung Lee and Jason J S Barton},
url = {http://www.jemr.org/download/pictures/7b/l57t1bylpgyjwqsmahtqbad5ra0hh8/abegg_lee_barton_final.pdf%5Cnpapers2://publication/uuid/943E311D-7127-4F23-9910-CE113FB9A4F3},
year = {2010},
date = {2010-01-01},
journal = {Journal of Eye Movement Research},
volume = {3},
number = {3},
pages = {1--10},
abstract = {Studies of memory-guided saccades in monkeys show an upward bias, while studies of antisaccades in humans show a diagonal effect, a deviation of endpoints toward the 45° diagonal. To determine if these two different spatial biases are specific to different types of saccades, we studied prosaccades, antisaccades and memory-guided saccades in humans. The diagonal effect occurred not with prosaccades but with antisaccades and memory-guided saccades with long intervals, consistent with hypotheses that it originates in computations of goal location under conditions of uncertainty. There was a small upward bias for memory-guided saccades but not prosaccades or antisaccades. Thus this bias is not a general effect of target uncertainty but a property specific to memory-guided saccades.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Studies of memory-guided saccades in monkeys show an upward bias, while studies of antisaccades in humans show a diagonal effect, a deviation of endpoints toward the 45° diagonal. To determine if these two different spatial biases are specific to different types of saccades, we studied prosaccades, antisaccades and memory-guided saccades in humans. The diagonal effect occurred not with prosaccades but with antisaccades and memory-guided saccades with long intervals, consistent with hypotheses that it originates in computations of goal location under conditions of uncertainty. There was a small upward bias for memory-guided saccades but not prosaccades or antisaccades. Thus this bias is not a general effect of target uncertainty but a property specific to memory-guided saccades. |
Mathias Abegg; Amadeo R Rodriguez; Hyung Lee; Jason J S Barton ‘Alternate-goal bias' in antisaccades and the inXuence of expectation Journal Article Experimental Brain Research, 203 (3), pp. 553–562, 2010. Abstract | Links | BibTeX @article{Abegg2010a,
title = {‘Alternate-goal bias' in antisaccades and the inXuence of expectation},
author = {Mathias Abegg and Amadeo R Rodriguez and Hyung Lee and Jason J S Barton},
doi = {10.1007/s00221-010-2259-6},
year = {2010},
date = {2010-01-01},
journal = {Experimental Brain Research},
volume = {203},
number = {3},
pages = {553--562},
abstract = {Saccadic performance depends on the requirements of the current trial, but also may be influenced by other trials in the same experiment. This effect of trial context has been investigated most for saccadic error rate and reaction time but seldom for the positional accuracy of saccadic landing points. We investigated whether the direction of saccades towards one goal is affected by the location of a second goal used in other trials in the same experimental block. In our first experiment, landing points ('endpoints') of antisaccades but not prosaccades were shifted towards the location of the alternate goal. This spatial bias decreased with increasing angular separation between the current and alternative goals. In a second experiment, we explored whether expectancy about the goal location was responsible for the biasing of the saccadic endpoint. For this, we used a condition where the saccadic goal randomly changed from one trial to the next between locations on, above or below the horizontal meridian. We modulated the prior probability of the alternate-goal location by showing cues prior to stimulus onset. The results showed that expectation about the possible positions of the saccadic goal is sufficient to bias saccadic endpoints and can account for at least part of this phenomenon of 'alternate-goal bias'.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Saccadic performance depends on the requirements of the current trial, but also may be influenced by other trials in the same experiment. This effect of trial context has been investigated most for saccadic error rate and reaction time but seldom for the positional accuracy of saccadic landing points. We investigated whether the direction of saccades towards one goal is affected by the location of a second goal used in other trials in the same experimental block. In our first experiment, landing points ('endpoints') of antisaccades but not prosaccades were shifted towards the location of the alternate goal. This spatial bias decreased with increasing angular separation between the current and alternative goals. In a second experiment, we explored whether expectancy about the goal location was responsible for the biasing of the saccadic endpoint. For this, we used a condition where the saccadic goal randomly changed from one trial to the next between locations on, above or below the horizontal meridian. We modulated the prior probability of the alternate-goal location by showing cues prior to stimulus onset. The results showed that expectation about the possible positions of the saccadic goal is sufficient to bias saccadic endpoints and can account for at least part of this phenomenon of 'alternate-goal bias'. |
Mathias Abegg; Dara S Manoach; Jason J S Barton Knowing the future: Partial foreknowledge effects on the programming of prosaccades and antisaccades Journal Article Vision Research, 51 (1), pp. 215–221, 2011. Abstract | Links | BibTeX @article{Abegg2011,
title = {Knowing the future: Partial foreknowledge effects on the programming of prosaccades and antisaccades},
author = {Mathias Abegg and Dara S Manoach and Jason J S Barton},
doi = {10.1016/j.visres.2010.11.006},
year = {2011},
date = {2011-01-01},
journal = {Vision Research},
volume = {51},
number = {1},
pages = {215--221},
abstract = {Foreknowledge about the demands of an upcoming trial may be exploited to optimize behavioural responses. In the current study we systematically investigated the benefits of partial foreknowledge - that is, when some but not all aspects of a future trial are known in advance. For this we used an ocular motor paradigm with horizontal prosaccades and antisaccades. Predictable sequences were used to create three partial foreknowledge conditions: one with foreknowledge about the stimulus location only, one with foreknowledge about the task set only, and one with foreknowledge about the direction of the required response only. These were contrasted with a condition of no-foreknowledge and a condition of complete foreknowledge about all three parameters. The results showed that the three types of foreknowledge affected saccadic efficiency differently. While foreknowledge about stimulus-location had no effect on efficiency, task foreknowledge had some effect and response-foreknowledge was as effective as complete foreknowledge. Foreknowledge effects on switch costs followed a similar pattern in general, but were not specific for switching of the trial attribute for which foreknowledge was available. We conclude that partial foreknowledge has a differential effect on efficiency, most consistent with preparatory activation of a motor schema in advance of the stimulus, with consequent benefits for both switched and repeated trials.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Foreknowledge about the demands of an upcoming trial may be exploited to optimize behavioural responses. In the current study we systematically investigated the benefits of partial foreknowledge - that is, when some but not all aspects of a future trial are known in advance. For this we used an ocular motor paradigm with horizontal prosaccades and antisaccades. Predictable sequences were used to create three partial foreknowledge conditions: one with foreknowledge about the stimulus location only, one with foreknowledge about the task set only, and one with foreknowledge about the direction of the required response only. These were contrasted with a condition of no-foreknowledge and a condition of complete foreknowledge about all three parameters. The results showed that the three types of foreknowledge affected saccadic efficiency differently. While foreknowledge about stimulus-location had no effect on efficiency, task foreknowledge had some effect and response-foreknowledge was as effective as complete foreknowledge. Foreknowledge effects on switch costs followed a similar pattern in general, but were not specific for switching of the trial attribute for which foreknowledge was available. We conclude that partial foreknowledge has a differential effect on efficiency, most consistent with preparatory activation of a motor schema in advance of the stimulus, with consequent benefits for both switched and repeated trials. |
Mathias Abegg; Nishant Sharma; Jason J S Barton Antisaccades generate two types of saccadic inhibition Journal Article Biological Psychology, 89 (1), pp. 191–194, 2012. Abstract | Links | BibTeX @article{Abegg2012,
title = {Antisaccades generate two types of saccadic inhibition},
author = {Mathias Abegg and Nishant Sharma and Jason J S Barton},
doi = {10.1016/j.biopsycho.2011.10.007},
year = {2012},
date = {2012-01-01},
journal = {Biological Psychology},
volume = {89},
number = {1},
pages = {191--194},
abstract = {To make an antisaccade away from a stimulus, one must also suppress the more reflexive prosaccade to the stimulus. Whether this inhibition is diffuse or specific for saccade direction is not known. We used a paradigm examining inter-trial carry-over effects. Twelve subjects performed sequences of four identical antisaccades followed by sequences of four prosaccades randomly directed at the location of the antisaccade stimulus, the location of the antisaccade goal, or neutral locations. We found two types of persistent antisaccade-related inhibition. First, prosaccades in any direction were delayed only in the first trial after the antisaccades. Second, prosaccades to the location of the antisaccade stimulus were delayed more than all other prosaccades, and this persisted from the first to the fourth subsequent trial. These findings are consistent with both a transient global inhibition and a more sustained focal inhibition specific for the location of the antisaccade stimulus.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
To make an antisaccade away from a stimulus, one must also suppress the more reflexive prosaccade to the stimulus. Whether this inhibition is diffuse or specific for saccade direction is not known. We used a paradigm examining inter-trial carry-over effects. Twelve subjects performed sequences of four identical antisaccades followed by sequences of four prosaccades randomly directed at the location of the antisaccade stimulus, the location of the antisaccade goal, or neutral locations. We found two types of persistent antisaccade-related inhibition. First, prosaccades in any direction were delayed only in the first trial after the antisaccades. Second, prosaccades to the location of the antisaccade stimulus were delayed more than all other prosaccades, and this persisted from the first to the fourth subsequent trial. These findings are consistent with both a transient global inhibition and a more sustained focal inhibition specific for the location of the antisaccade stimulus. |
Mathias Abegg; Dario Pianezzi; Jason J S Barton A vertical asymmetry in saccades Journal Article Journal of Eye Movement Research, 8 (5), pp. 1–10, 2015. Abstract | Links | BibTeX @article{Abegg2015,
title = {A vertical asymmetry in saccades},
author = {Mathias Abegg and Dario Pianezzi and Jason J S Barton},
doi = {10.16910/jemr.8.5.3},
year = {2015},
date = {2015-01-01},
journal = {Journal of Eye Movement Research},
volume = {8},
number = {5},
pages = {1--10},
abstract = {Visual exploration of natural scenes imposes demands that differ between the upper and the lower visual hemifield. Yet little is known about how ocular motor performance is affected by the location of visual stimuli or the direction of a behavioural response. We compared saccadic latencies between upper and lower hemifield in a variety of conditions, including short-latency prosaccades, long-latency prosaccades, antisaccades, memory-guided saccades and saccades with increased attentional and selection demand. All saccade types, except memory guided saccades, had shorter latencies when saccades were directed towards the upper field as compared to downward saccades (ptextless0.05). This upper field reaction time advantage probably arises in ocular motor rather than visual processing. It may originate in structures involved in motor preparation rather than execution.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Visual exploration of natural scenes imposes demands that differ between the upper and the lower visual hemifield. Yet little is known about how ocular motor performance is affected by the location of visual stimuli or the direction of a behavioural response. We compared saccadic latencies between upper and lower hemifield in a variety of conditions, including short-latency prosaccades, long-latency prosaccades, antisaccades, memory-guided saccades and saccades with increased attentional and selection demand. All saccade types, except memory guided saccades, had shorter latencies when saccades were directed towards the upper field as compared to downward saccades (ptextless0.05). This upper field reaction time advantage probably arises in ocular motor rather than visual processing. It may originate in structures involved in motor preparation rather than execution. |
Naotoshi Abekawa; H Gomi Spatial coincidence of intentional actions modulates an implicit visuomotor control Journal Article Journal of Neurophysiology, 103 (5), pp. 2717–2727, 2010. Abstract | Links | BibTeX @article{Abekawa2010,
title = {Spatial coincidence of intentional actions modulates an implicit visuomotor control},
author = {Naotoshi Abekawa and H Gomi},
url = {http://jn.physiology.org/cgi/doi/10.1152/jn.91133.2008},
doi = {10.1152/jn.91133.2008},
year = {2010},
date = {2010-01-01},
journal = {Journal of Neurophysiology},
volume = {103},
number = {5},
pages = {2717--2727},
abstract = {We investigated a visuomotor mechanism contributing to reach correction: the manual following response (MFR), which is a quick response to background visual motion that frequently occurs as a reafference when the body moves. Although several visual specificities of the MFR have been elucidated, the functional and computational mechanisms of its motor coordination remain unclear mainly because it involves complex relationships among gaze, reaching target, and visual stimuli. To directly explore how these factors interact in the MFR, we assessed the impact of spatial coincidences among gaze, arm reaching, and visual motion on the MFR. When gaze location was displaced from the reaching target with an identical visual motion kept on the retina, the amplitude of the MFR significantly decreased as displacement increased. A factorial manipulation of gaze, reaching-target, and visual motion locations showed that the response decrease is due to the spatial separation between gaze and reaching target but is not due to the spatial separation between visual motion and reaching target. Additionally, elimination of visual motion around the fovea attenuated the MFR. The effects of these spatial coincidences on the MFR are completely different from their effects on the perceptual mislocalization of targets caused by visual motion. Furthermore, we found clear differences between the modulation sensitivities of the MFR and the ocular following response to spatial mismatch between gaze and reaching locations. These results suggest that the MFR modulation observed in our experiment is not due to changes in visual interaction between target and visual motion or to modulation of motion sensitivity in early visual processing. Instead the motor command of the MFR appears to be modulated by the spatial relationship between gaze and reaching.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We investigated a visuomotor mechanism contributing to reach correction: the manual following response (MFR), which is a quick response to background visual motion that frequently occurs as a reafference when the body moves. Although several visual specificities of the MFR have been elucidated, the functional and computational mechanisms of its motor coordination remain unclear mainly because it involves complex relationships among gaze, reaching target, and visual stimuli. To directly explore how these factors interact in the MFR, we assessed the impact of spatial coincidences among gaze, arm reaching, and visual motion on the MFR. When gaze location was displaced from the reaching target with an identical visual motion kept on the retina, the amplitude of the MFR significantly decreased as displacement increased. A factorial manipulation of gaze, reaching-target, and visual motion locations showed that the response decrease is due to the spatial separation between gaze and reaching target but is not due to the spatial separation between visual motion and reaching target. Additionally, elimination of visual motion around the fovea attenuated the MFR. The effects of these spatial coincidences on the MFR are completely different from their effects on the perceptual mislocalization of targets caused by visual motion. Furthermore, we found clear differences between the modulation sensitivities of the MFR and the ocular following response to spatial mismatch between gaze and reaching locations. These results suggest that the MFR modulation observed in our experiment is not due to changes in visual interaction between target and visual motion or to modulation of motion sensitivity in early visual processing. Instead the motor command of the MFR appears to be modulated by the spatial relationship between gaze and reaching. |
Naotoshi Abekawa; Toshio Inui; Hiroaki Gomi Eye-hand coordination in on-line visuomotor adjustments Journal Article NeuroReport, 25 (7), pp. 441–445, 2014. Abstract | Links | BibTeX @article{Abekawa2014,
title = {Eye-hand coordination in on-line visuomotor adjustments},
author = {Naotoshi Abekawa and Toshio Inui and Hiroaki Gomi},
doi = {10.1097/WNR.0000000000000111},
year = {2014},
date = {2014-01-01},
journal = {NeuroReport},
volume = {25},
number = {7},
pages = {441--445},
abstract = {When we perform a visually guided reaching action, the brain coordinates our hand and eye movements. Eye-hand coordination has been examined widely, but it remains unclear whether the hand and eye motor systems are coordinated during on-line visuomotor adjustments induced by a target jump during a reaching movement. As such quick motor responses are required when we interact with dynamic environments, eye and hand movements could be coordinated even during on-line motor control. Here, we examine the relationship between online hand adjustment and saccadic eye movement. In contrast to the well-known temporal order of eye and hand initiations where the hand follows the eyes, we found that on-line hand adjustment was initiated before the saccade onset. Despite this order reversal, a correlation between hand and saccade latencies was observed, suggesting that the hand motor system is not independent of eye control even when the hand response was induced before the saccade. Moreover, the latency of the hand adjustment with saccadic eye movement was significantly shorter than that with eye fixation. This hand latency modulation cannot be ascribed to any changes of visual or oculomotor reafferent information as the saccade was not yet initiated when the hand adjustment started. Taken together, the hand motor system would receive preparation signals rather than reafference signals of saccadic eye movements to provide quick manual adjustments of the goal-directed eye-hand movements.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
When we perform a visually guided reaching action, the brain coordinates our hand and eye movements. Eye-hand coordination has been examined widely, but it remains unclear whether the hand and eye motor systems are coordinated during on-line visuomotor adjustments induced by a target jump during a reaching movement. As such quick motor responses are required when we interact with dynamic environments, eye and hand movements could be coordinated even during on-line motor control. Here, we examine the relationship between online hand adjustment and saccadic eye movement. In contrast to the well-known temporal order of eye and hand initiations where the hand follows the eyes, we found that on-line hand adjustment was initiated before the saccade onset. Despite this order reversal, a correlation between hand and saccade latencies was observed, suggesting that the hand motor system is not independent of eye control even when the hand response was induced before the saccade. Moreover, the latency of the hand adjustment with saccadic eye movement was significantly shorter than that with eye fixation. This hand latency modulation cannot be ascribed to any changes of visual or oculomotor reafferent information as the saccade was not yet initiated when the hand adjustment started. Taken together, the hand motor system would receive preparation signals rather than reafference signals of saccadic eye movements to provide quick manual adjustments of the goal-directed eye-hand movements. |
Naotoshi Abekawa; Hiroaki Gomi Online gain update for manual following response accompanied by gaze shift during arm reaching Journal Article Journal of Neurophysiology, 113 (4), pp. 1206–1216, 2015. Abstract | Links | BibTeX @article{Abekawa2015,
title = {Online gain update for manual following response accompanied by gaze shift during arm reaching},
author = {Naotoshi Abekawa and Hiroaki Gomi},
url = {http://www.physiology.org/doi/10.1152/jn.00281.2014},
doi = {10.1152/jn.00281.2014},
year = {2015},
date = {2015-01-01},
journal = {Journal of Neurophysiology},
volume = {113},
number = {4},
pages = {1206--1216},
abstract = {To capture objects by hand, online motor corrections are required to compensate for self-body movements. Recent studies have shown that background visual motion, usually caused by body movement, plays a significant role in such online corrections. Visual motion applied during a reaching movement induces a rapid and automatic manual following response (MFR) in the direction of the visual motion. Importantly, the MFR amplitude is modulated by the gaze direction relative to the reach target location (i.e., foveal or peripheral reaching). That is, the brain specifies the adequate visuomotor gain for an online controller based on gaze-reach coordination. However, the time or state point at which the brain specifies this visuomotor gain remains unclear. More specifically, does the gain change occur even during the execution of reaching? In the present study, we measured MFR amplitudes during a task in which the participant performed a saccadic eye movement that altered the gaze-reach coordination during reaching. The results indicate that the MFR amplitude immediately after the saccade termination changed according to the new gaze-reach coordination, suggesting a flexible online updating of the MFR gain during reaching. An additional experiment showed that this gain updating mostly started before the saccade terminated. Therefore, the MFR gain updating process would be triggered by an ocular command related to saccade planning or execution based on forthcoming changes in the gaze-reach coordination. Our findings suggest that the brain flexibly updates the visuomotor gain for an online controller even during reaching movements based on continuous monitoring of the gaze-reach coordination.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
To capture objects by hand, online motor corrections are required to compensate for self-body movements. Recent studies have shown that background visual motion, usually caused by body movement, plays a significant role in such online corrections. Visual motion applied during a reaching movement induces a rapid and automatic manual following response (MFR) in the direction of the visual motion. Importantly, the MFR amplitude is modulated by the gaze direction relative to the reach target location (i.e., foveal or peripheral reaching). That is, the brain specifies the adequate visuomotor gain for an online controller based on gaze-reach coordination. However, the time or state point at which the brain specifies this visuomotor gain remains unclear. More specifically, does the gain change occur even during the execution of reaching? In the present study, we measured MFR amplitudes during a task in which the participant performed a saccadic eye movement that altered the gaze-reach coordination during reaching. The results indicate that the MFR amplitude immediately after the saccade termination changed according to the new gaze-reach coordination, suggesting a flexible online updating of the MFR gain during reaching. An additional experiment showed that this gain updating mostly started before the saccade terminated. Therefore, the MFR gain updating process would be triggered by an ocular command related to saccade planning or execution based on forthcoming changes in the gaze-reach coordination. Our findings suggest that the brain flexibly updates the visuomotor gain for an online controller even during reaching movements based on continuous monitoring of the gaze-reach coordination. |
Dekel Abeles; Shlomit Yuval-Greenberg Just look away: Gaze aversions as an overt attentional disengagement mechanism Journal Article Cognition, 168 , pp. 99–109, 2017. Abstract | Links | BibTeX @article{Abeles2017,
title = {Just look away: Gaze aversions as an overt attentional disengagement mechanism},
author = {Dekel Abeles and Shlomit Yuval-Greenberg},
url = {http://dx.doi.org/10.1016/j.cognition.2017.06.021},
doi = {10.1016/j.cognition.2017.06.021},
year = {2017},
date = {2017-01-01},
journal = {Cognition},
volume = {168},
pages = {99--109},
publisher = {Elsevier B.V.},
abstract = {During visual exploration of a scene, the eye-gaze tends to be directed toward more salient image-locations, containing more information. However, while performing non-visual tasks, such information-seeking behavior could be detrimental to performance, as the perception of irrelevant but salient visual input may unnecessarily increase the cognitive-load. It would be therefore beneficial if during non-visual tasks, eye-gaze would be governed by a drive to reduce saliency rather than maximize it. The current study examined the phenomenon of gaze-aversion during non-visual tasks, which is hypothesized to act as an active avoidance mechanism. In two experiments, gaze-position was monitored by an eye-tracker while participants performed an auditory mental arithmetic task, and in a third experiment they performed an undemanding naming task. Task-irrelevant simple motion stimuli (drifting grating and random dot kinematogram) were centrally presented, moving at varying speeds. Participants averted their gaze away from the moving stimuli more frequently and for longer proportions of the time when the motion was faster than when it was slower. Additionally, a positive correlation was found between the task's difficulty and this aversion behavior. When the task was highly undemanding, no gaze aversion behavior was observed. We conclude that gaze aversion is an active avoidance strategy, sensitive to both the physical features of the visual distractions and the cognitive load imposed by the non-visual task.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
During visual exploration of a scene, the eye-gaze tends to be directed toward more salient image-locations, containing more information. However, while performing non-visual tasks, such information-seeking behavior could be detrimental to performance, as the perception of irrelevant but salient visual input may unnecessarily increase the cognitive-load. It would be therefore beneficial if during non-visual tasks, eye-gaze would be governed by a drive to reduce saliency rather than maximize it. The current study examined the phenomenon of gaze-aversion during non-visual tasks, which is hypothesized to act as an active avoidance mechanism. In two experiments, gaze-position was monitored by an eye-tracker while participants performed an auditory mental arithmetic task, and in a third experiment they performed an undemanding naming task. Task-irrelevant simple motion stimuli (drifting grating and random dot kinematogram) were centrally presented, moving at varying speeds. Participants averted their gaze away from the moving stimuli more frequently and for longer proportions of the time when the motion was faster than when it was slower. Additionally, a positive correlation was found between the task's difficulty and this aversion behavior. When the task was highly undemanding, no gaze aversion behavior was observed. We conclude that gaze aversion is an active avoidance strategy, sensitive to both the physical features of the visual distractions and the cognitive load imposed by the non-visual task. |
Arman Abrahamyan; Laura Luz Silva; Steven C Dakin; Matteo Carandini; Justin L Gardner Adaptable history biases in human perceptual decisions Journal Article Proceedings of the National Academy of Sciences, 113 (25), pp. E3548–E3557, 2016. Abstract | Links | BibTeX @article{Abrahamyan2016,
title = {Adaptable history biases in human perceptual decisions},
author = {Arman Abrahamyan and Laura Luz Silva and Steven C Dakin and Matteo Carandini and Justin L Gardner},
url = {http://www.pnas.org/lookup/doi/10.1073/pnas.1518786113},
doi = {10.1073/pnas.1518786113},
year = {2016},
date = {2016-01-01},
journal = {Proceedings of the National Academy of Sciences},
volume = {113},
number = {25},
pages = {E3548--E3557},
abstract = {When making choices under conditions of perceptual uncertainty, past experience can play a vital role. However, it can also lead to biases that worsen decisions. Consistent with previous observations, we found that human choices are influenced by the success or failure of past choices even in a standard two-alternative detection task, where choice history is irrelevant. The typical bias was one that made the subject switch choices after a failure. These choice history biases led to poorer performance and were similar for observers in different countries. They were well captured by a simple logistic regression model that had been previously applied to describe psychophysical performance in mice. Such irrational biases seem at odds with the principles of reinforcement learning, which would predict exquisite adaptability to choice history. We therefore asked whether subjects could adapt their irrational biases following changes in trial order statistics. Adaptability was strong in the direction that confirmed a subject's default biases, but weaker in the opposite direction, so that existing biases could not be eradicated. We conclude that humans can adapt choice history biases, but cannot easily overcome existing biases even if irrational in the current context: adaptation is more sensitive to confirmatory than contradictory statistics.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
When making choices under conditions of perceptual uncertainty, past experience can play a vital role. However, it can also lead to biases that worsen decisions. Consistent with previous observations, we found that human choices are influenced by the success or failure of past choices even in a standard two-alternative detection task, where choice history is irrelevant. The typical bias was one that made the subject switch choices after a failure. These choice history biases led to poorer performance and were similar for observers in different countries. They were well captured by a simple logistic regression model that had been previously applied to describe psychophysical performance in mice. Such irrational biases seem at odds with the principles of reinforcement learning, which would predict exquisite adaptability to choice history. We therefore asked whether subjects could adapt their irrational biases following changes in trial order statistics. Adaptability was strong in the direction that confirmed a subject's default biases, but weaker in the opposite direction, so that existing biases could not be eradicated. We conclude that humans can adapt choice history biases, but cannot easily overcome existing biases even if irrational in the current context: adaptation is more sensitive to confirmatory than contradictory statistics. |
Alper Açik; Selim Onat; Frank Schumann; Wolfgang Einhäuser; Peter König Effects of luminance contrast and its modifications on fixation behavior during free viewing of images from different categories Journal Article Vision Research, 49 (12), pp. 1541–1553, 2009. Abstract | Links | BibTeX @article{Acik2009,
title = {Effects of luminance contrast and its modifications on fixation behavior during free viewing of images from different categories},
author = {Alper A{ç}ik and Selim Onat and Frank Schumann and Wolfgang Einhäuser and Peter König},
url = {http://dx.doi.org/10.1016/j.visres.2009.03.011},
doi = {10.1016/j.visres.2009.03.011},
year = {2009},
date = {2009-01-01},
journal = {Vision Research},
volume = {49},
number = {12},
pages = {1541--1553},
publisher = {Elsevier Ltd},
abstract = {During viewing of natural scenes, do low-level features guide attention, and if so, does this depend on higher-level features? To answer these questions, we studied the image category dependence of low-level feature modification effects. Subjects fixated contrast-modified regions often in natural scene images, while smaller but significant effects were observed for urban scenes and faces. Surprisingly, modifications in fractal images did not influence fixations. Further analysis revealed an inverse relationship between modification effects and higher-level, phase-dependent image features. We suggest that high- and mid-level features - such as edges, symmetries, and recursive patterns - guide attention if present. However, if the scene lacks such diagnostic properties, low-level features prevail. We posit a hierarchical framework, which combines aspects of bottom-up and top-down theories and is compatible with our data.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
During viewing of natural scenes, do low-level features guide attention, and if so, does this depend on higher-level features? To answer these questions, we studied the image category dependence of low-level feature modification effects. Subjects fixated contrast-modified regions often in natural scene images, while smaller but significant effects were observed for urban scenes and faces. Surprisingly, modifications in fractal images did not influence fixations. Further analysis revealed an inverse relationship between modification effects and higher-level, phase-dependent image features. We suggest that high- and mid-level features - such as edges, symmetries, and recursive patterns - guide attention if present. However, if the scene lacks such diagnostic properties, low-level features prevail. We posit a hierarchical framework, which combines aspects of bottom-up and top-down theories and is compatible with our data. |
Alper Açik; Adjmal Sarwary; Rafael Schultze-Kraft; Selim Onat; Peter König Developmental changes in natural viewing behavior: Bottom-up and top-down differences between children, young adults and older adults Journal Article Frontiers in Psychology, 1 , pp. 1–14, 2010. Abstract | Links | BibTeX @article{Acik2010,
title = {Developmental changes in natural viewing behavior: Bottom-up and top-down differences between children, young adults and older adults},
author = {Alper A{ç}ik and Adjmal Sarwary and Rafael Schultze-Kraft and Selim Onat and Peter König},
doi = {10.3389/fpsyg.2010.00207},
year = {2010},
date = {2010-01-01},
journal = {Frontiers in Psychology},
volume = {1},
pages = {1--14},
publisher = {10},
address = {doi},
abstract = {Despite the growing interest in fixation selection under natural conditions, there is a major gap in the literature concerning its developmental aspects. Early in life, bottom-up processes, such as local image feature - color, luminance contrast etc. - guided viewing, might be prominent but later overshadowed by more top-down processing. Moreover, with decline in visual functioning in old age, bottom-up processing is known to suffer. Here we recorded eye movements of 7- to 9-year-old children, 19- to 27-year-old adults, and older adults above 72 years of age while they viewed natural and complex images before performing a patch-recognition task. Task performance displayed the classical inverted U-shape, with young adults outperforming the other age groups. Fixation discrimination performance of local feature values dropped with age. Whereas children displayed the highest feature values at fixated points, suggesting a bottom-up mechanism, older adult viewing behavior was less feature-dependent, reminiscent of a top-down strategy. Importantly, we observed a double dissociation between children and elderly regarding the effects of active viewing on feature-related viewing: Explorativeness correlated with feature-related viewing negatively in young age, and positively in older adults. The results indicate that, with age, bottom-up fixation selection loses strength and/or the role of top-down processes becomes more important. Older adults who increase their feature-related viewing by being more explorative make use of this low-level information and perform better in the task. The present study thus reveals an important developmental change in natural and task-guided viewing.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Despite the growing interest in fixation selection under natural conditions, there is a major gap in the literature concerning its developmental aspects. Early in life, bottom-up processes, such as local image feature - color, luminance contrast etc. - guided viewing, might be prominent but later overshadowed by more top-down processing. Moreover, with decline in visual functioning in old age, bottom-up processing is known to suffer. Here we recorded eye movements of 7- to 9-year-old children, 19- to 27-year-old adults, and older adults above 72 years of age while they viewed natural and complex images before performing a patch-recognition task. Task performance displayed the classical inverted U-shape, with young adults outperforming the other age groups. Fixation discrimination performance of local feature values dropped with age. Whereas children displayed the highest feature values at fixated points, suggesting a bottom-up mechanism, older adult viewing behavior was less feature-dependent, reminiscent of a top-down strategy. Importantly, we observed a double dissociation between children and elderly regarding the effects of active viewing on feature-related viewing: Explorativeness correlated with feature-related viewing negatively in young age, and positively in older adults. The results indicate that, with age, bottom-up fixation selection loses strength and/or the role of top-down processes becomes more important. Older adults who increase their feature-related viewing by being more explorative make use of this low-level information and perform better in the task. The present study thus reveals an important developmental change in natural and task-guided viewing. |
Alper Acik; Andreas Bartel; Peter Konig Real and implied motion at the center of gaze Journal Article Journal of Vision, 14 (1), pp. 1–19, 2014. Abstract | Links | BibTeX @article{Acik2014,
title = {Real and implied motion at the center of gaze},
author = {Alper Acik and Andreas Bartel and Peter Konig},
doi = {10.1109/ICMTS.2016.7476201},
year = {2014},
date = {2014-01-01},
journal = {Journal of Vision},
volume = {14},
number = {1},
pages = {1--19},
abstract = {Even though the dynamicity of our environment is a given, much of what we know on fixation selection comes from studies of static scene viewing. We performed a direct comparison of fixation selection on static and dynamic visual stimuli and investigated how far identical mechanisms drive these. We recorded eye movements while participants viewed movie clips of natural scenery and static frames taken from the same movies. Both were presented in the same high spatial resolution (1080 textperiodcentered 1920 pixels). The static condition allowed us to check whether local movement features computed from movies are salient even when presented as single frames. We observed that during the first second of viewing, movement and static features are equally salient in both conditions. Furthermore, predictability of fixations based on movement features decreased faster when viewing static frames as compared with viewing movie clips. Yet even during the later portion of static-frame viewing, the predictive value of movement features was still high above chance. Moreover, we demonstrated that, whereas the sets of movement and static features were statistically dependent within these sets, respectively, no dependence was observed between the two sets. Based on these results, we argue that implied motion is predictive of fixation similarly to real movement and that the onset of motion in natural stimuli is more salient than ongoing movement is. The present results allow us to address to what extent and when static image viewing is similar to the perception of a dynamic environment.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Even though the dynamicity of our environment is a given, much of what we know on fixation selection comes from studies of static scene viewing. We performed a direct comparison of fixation selection on static and dynamic visual stimuli and investigated how far identical mechanisms drive these. We recorded eye movements while participants viewed movie clips of natural scenery and static frames taken from the same movies. Both were presented in the same high spatial resolution (1080 textperiodcentered 1920 pixels). The static condition allowed us to check whether local movement features computed from movies are salient even when presented as single frames. We observed that during the first second of viewing, movement and static features are equally salient in both conditions. Furthermore, predictability of fixations based on movement features decreased faster when viewing static frames as compared with viewing movie clips. Yet even during the later portion of static-frame viewing, the predictive value of movement features was still high above chance. Moreover, we demonstrated that, whereas the sets of movement and static features were statistically dependent within these sets, respectively, no dependence was observed between the two sets. Based on these results, we argue that implied motion is predictive of fixation similarly to real movement and that the onset of motion in natural stimuli is more salient than ongoing movement is. The present results allow us to address to what extent and when static image viewing is similar to the perception of a dynamic environment. |
John F Ackermann; M S Landy Statistical templates for visual search Journal Article Journal of Vision, 14 (3), pp. 1–17, 2014. Abstract | Links | BibTeX @article{Ackermann2014,
title = {Statistical templates for visual search},
author = {John F Ackermann and M S Landy},
url = {http://jov.arvojournals.org/Article.aspx?doi=10.1167/14.3.18},
doi = {10.1167/14.3.18},
year = {2014},
date = {2014-01-01},
journal = {Journal of Vision},
volume = {14},
number = {3},
pages = {1--17},
abstract = {How do we find a target embedded in a scene? Within the framework of signal detection theory, this task is carried out by comparing each region of the scene with a "template," i.e., an internal representation of the search target. Here we ask what form this representation takes when the search target is a complex image with uncertain orientation. We examine three possible representations. The first is the matched filter. Such a representation cannot account for the ease with which humans can find a complex search target that is rotated relative to the template. A second representation attempts to deal with this by estimating the relative orientation of target and match and rotating the intensity-based template. No intensity-based template, however, can account for the ability to easily locate targets that are defined categorically and not in terms of a specific arrangement of pixels. Thus, we define a third template that represents the target in terms of image statistics rather than pixel intensities. Subjects performed a two-alternative, forced-choice search task in which they had to localize an image that matched a previously viewed target. Target images were texture patches. In one condition, match images were the same image as the target and distractors were a different image of the same textured material. In the second condition, the match image was of the same texture as the target (but different pixels) and the distractor was an image of a different texture. Match and distractor stimuli were randomly rotated relative to the target. We compared human performance to pixel-based, pixel-based with rotation, and statistic-based search models. The statistic-based search model was most successful at matching human performance. We conclude that humans use summary statistics to search for complex visual targets.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
How do we find a target embedded in a scene? Within the framework of signal detection theory, this task is carried out by comparing each region of the scene with a "template," i.e., an internal representation of the search target. Here we ask what form this representation takes when the search target is a complex image with uncertain orientation. We examine three possible representations. The first is the matched filter. Such a representation cannot account for the ease with which humans can find a complex search target that is rotated relative to the template. A second representation attempts to deal with this by estimating the relative orientation of target and match and rotating the intensity-based template. No intensity-based template, however, can account for the ability to easily locate targets that are defined categorically and not in terms of a specific arrangement of pixels. Thus, we define a third template that represents the target in terms of image statistics rather than pixel intensities. Subjects performed a two-alternative, forced-choice search task in which they had to localize an image that matched a previously viewed target. Target images were texture patches. In one condition, match images were the same image as the target and distractors were a different image of the same textured material. In the second condition, the match image was of the same texture as the target (but different pixels) and the distractor was an image of a different texture. Match and distractor stimuli were randomly rotated relative to the target. We compared human performance to pixel-based, pixel-based with rotation, and statistic-based search models. The statistic-based search model was most successful at matching human performance. We conclude that humans use summary statistics to search for complex visual targets. |
John F Ackermann; Michael S Landy Suboptimal decision criteria are predicted by subjectively weighted probabilities and rewards Journal Article Attention, Perception, and Psychophysics, 77 (2), pp. 638–658, 2015. Abstract | Links | BibTeX @article{Ackermann2015,
title = {Suboptimal decision criteria are predicted by subjectively weighted probabilities and rewards},
author = {John F Ackermann and Michael S Landy},
doi = {10.3758/s13414-014-0779-z},
year = {2015},
date = {2015-01-01},
journal = {Attention, Perception, and Psychophysics},
volume = {77},
number = {2},
pages = {638--658},
abstract = {Subjects performed a visual detection task in which the probability of target occurrence at each of the two possible locations, and the rewards for correct responses for each, were varied across conditions. To maximize monetary gain, observers should bias their responses, choosing one location more often than the other in line with the varied probabilities and rewards. Typically, and in our task, observers do not bias their responses to the extent they should, and instead distribute their responses more evenly across locations, a phenomenon referred to as 'conservatism.' We investigated several hypotheses regarding the source of the conservatism. We measured utility and probability weighting functions under Prospect Theory for each subject in an independent economic choice task and used the weighting-function parameters to calculate each subject's subjective utility (SU(c)) as a function of the criterion c, and the corresponding weighted optimal criteria (wc opt ). Subjects' criteria were not close to optimal relative to wc opt . The slope of SU(c) and of expected gain EG(c) at the neutral criterion corresponding to $beta$ = 1 were both predictive of the subjects' criteria. The slope of SU(c) was a better predictor of observers' decision criteria overall. Thus, rather than behaving optimally, subjects move their criterion away from the neutral criterion by estimating how much they stand to gain by such a change based on the slope of subjective gain as a function of criterion, using inherently distorted probabilities and values.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Subjects performed a visual detection task in which the probability of target occurrence at each of the two possible locations, and the rewards for correct responses for each, were varied across conditions. To maximize monetary gain, observers should bias their responses, choosing one location more often than the other in line with the varied probabilities and rewards. Typically, and in our task, observers do not bias their responses to the extent they should, and instead distribute their responses more evenly across locations, a phenomenon referred to as 'conservatism.' We investigated several hypotheses regarding the source of the conservatism. We measured utility and probability weighting functions under Prospect Theory for each subject in an independent economic choice task and used the weighting-function parameters to calculate each subject's subjective utility (SU(c)) as a function of the criterion c, and the corresponding weighted optimal criteria (wc opt ). Subjects' criteria were not close to optimal relative to wc opt . The slope of SU(c) and of expected gain EG(c) at the neutral criterion corresponding to $beta$ = 1 were both predictive of the subjects' criteria. The slope of SU(c) was a better predictor of observers' decision criteria overall. Thus, rather than behaving optimally, subjects move their criterion away from the neutral criterion by estimating how much they stand to gain by such a change based on the slope of subjective gain as a function of criterion, using inherently distorted probabilities and values. |
David J Acunzo; John M Henderson No emotional "Pop-out" effect in natural scene viewing Journal Article Emotion, 11 (5), pp. 1134–1143, 2011. Abstract | Links | BibTeX @article{Acunzo2011,
title = {No emotional "Pop-out" effect in natural scene viewing},
author = {David J Acunzo and John M Henderson},
doi = {10.1037/a0022586},
year = {2011},
date = {2011-01-01},
journal = {Emotion},
volume = {11},
number = {5},
pages = {1134--1143},
abstract = {It has been shown that attention is drawn toward emotional stimuli. In particular, eye movement research suggests that gaze is attracted toward emotional stimuli in an unconscious, automated manner. We addressed whether this effect remains when emotional targets are embedded within complex real-world scenes. Eye movements were recorded while participants memorized natural images. Each image contained an item that was either neutral, such as a bag, or emotional, such as a snake or a couple hugging. We found no latency difference for the first target fixation between the emotional and neutral conditions, suggesting no extrafoveal "pop-out" effect of emotional targets. However, once detected, emotional targets held attention for a longer time than neutral targets. The failure of emotional items to attract attention seems to contradict previous eye-movement research using emotional stimuli. However, our results are consistent with studies examining semantic drive of overt attention in natural scenes. Interpretations of the results in terms of perceptual and attentional load are provided.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
It has been shown that attention is drawn toward emotional stimuli. In particular, eye movement research suggests that gaze is attracted toward emotional stimuli in an unconscious, automated manner. We addressed whether this effect remains when emotional targets are embedded within complex real-world scenes. Eye movements were recorded while participants memorized natural images. Each image contained an item that was either neutral, such as a bag, or emotional, such as a snake or a couple hugging. We found no latency difference for the first target fixation between the emotional and neutral conditions, suggesting no extrafoveal "pop-out" effect of emotional targets. However, once detected, emotional targets held attention for a longer time than neutral targets. The failure of emotional items to attract attention seems to contradict previous eye-movement research using emotional stimuli. However, our results are consistent with studies examining semantic drive of overt attention in natural scenes. Interpretations of the results in terms of perceptual and attentional load are provided. |
Hamed Zivari Adab; Ivo D Popivanov; Wim Vanduffel; Rufin Vogels Perceptual learning of simple stimuli modifies stimulus representations in posterior inferior temporal cortex Journal Article Journal of Cognitive Neuroscience, 26 (10), pp. 2187–2200, 2014. Abstract | Links | BibTeX @article{Adab2014,
title = {Perceptual learning of simple stimuli modifies stimulus representations in posterior inferior temporal cortex},
author = {Hamed Zivari Adab and Ivo D Popivanov and Wim Vanduffel and Rufin Vogels},
doi = {10.1162/jocn},
year = {2014},
date = {2014-01-01},
journal = {Journal of Cognitive Neuroscience},
volume = {26},
number = {10},
pages = {2187--2200},
abstract = {Practicing simple visual detection and discrimination tasks improves performance, a signature of adult brain plasticity. The neural mechanisms that underlie these changes in performance are still unclear. Previously, we reported that practice in discriminating the orientation of noisy gratings (coarse orientation discrimination) increased the ability of single neurons in the early visual area V4 to discriminate the trained stimuli. Here, we ask whether practice in this task also changes the stimulus tuning properties of later visual cortical areas, despite the use of simple grating stimuli. To identify candidate areas, we used fMRI to map activations to noisy gratings in trained rhesus monkeys, revealing a region in the posterior inferior temporal (PIT) cortex. Subsequent single unit record- ings in PIT showed that the degree of orientation selectivity was similar to that of area V4 and that the PIT neurons discriminated the trained orientations better than the untrained orientations. Unlike in previous single unit studies of perceptual learning in early visual cortex, more PIT neurons preferred trained compared with untrained orientations. The effects of training on the responses to the grating stimuli were also present when the animals were performing a difficult orthogo- nal task in which the grating stimuli were task-irrelevant, suggesting that the training effect does not need attention to be expressed. The PIT neurons could support orientation discrimination at low signal-to-noise levels. These findings suggest that extensive practice in discriminating simple grating stimuli not only affects early visual cortex but also changes the stimulus tuning of a late visual cortical area.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Practicing simple visual detection and discrimination tasks improves performance, a signature of adult brain plasticity. The neural mechanisms that underlie these changes in performance are still unclear. Previously, we reported that practice in discriminating the orientation of noisy gratings (coarse orientation discrimination) increased the ability of single neurons in the early visual area V4 to discriminate the trained stimuli. Here, we ask whether practice in this task also changes the stimulus tuning properties of later visual cortical areas, despite the use of simple grating stimuli. To identify candidate areas, we used fMRI to map activations to noisy gratings in trained rhesus monkeys, revealing a region in the posterior inferior temporal (PIT) cortex. Subsequent single unit record- ings in PIT showed that the degree of orientation selectivity was similar to that of area V4 and that the PIT neurons discriminated the trained orientations better than the untrained orientations. Unlike in previous single unit studies of perceptual learning in early visual cortex, more PIT neurons preferred trained compared with untrained orientations. The effects of training on the responses to the grating stimuli were also present when the animals were performing a difficult orthogo- nal task in which the grating stimuli were task-irrelevant, suggesting that the training effect does not need attention to be expressed. The PIT neurons could support orientation discrimination at low signal-to-noise levels. These findings suggest that extensive practice in discriminating simple grating stimuli not only affects early visual cortex but also changes the stimulus tuning of a late visual cortical area. |
Jos J Adam; Simona Buetti; Dirk Kerzel Coordinated flexibility: How initial gaze position modulates eye-hand coordination and reaching Journal Article Journal of Experimental Psychology: Human Perception and Performance, 38 (4), pp. 891–901, 2012. Abstract | Links | BibTeX @article{Adam2012,
title = {Coordinated flexibility: How initial gaze position modulates eye-hand coordination and reaching},
author = {Jos J Adam and Simona Buetti and Dirk Kerzel},
doi = {10.1037/a0027592},
year = {2012},
date = {2012-01-01},
journal = {Journal of Experimental Psychology: Human Perception and Performance},
volume = {38},
number = {4},
pages = {891--901},
abstract = {Reaching to targets in space requires the coordination of eye and hand movements. In two experiments, we recorded eye and hand kinematics to examine the role of gaze position at target onset on eye-hand coordination and reaching performance. Experiment 1 showed that with eyes and hand aligned on the same peripheral start location, time lags between eye and hand onsets were small and initiation times were substantially correlated, suggesting simultaneous control and tight eye-hand coupling. With eyes and hand departing from different start locations (gaze aligned with the center of the range of possible target positions), time lags between eye and hand onsets were large and initiation times were largely uncorrelated, suggesting independent control and decoupling of eye and hand movements. Furthermore, initial gaze position strongly mediated manual reaching performance indexed by increments in movement time as a function of target distance. Experiment 2 confirmed the impact of target foveation in modulating the effect of target distance on movement time. Our findings reveal the operation of an overarching, flexible neural control system that tunes the operation and cooperation of saccadic and manual control systems depending on where the eyes look at target onset.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Reaching to targets in space requires the coordination of eye and hand movements. In two experiments, we recorded eye and hand kinematics to examine the role of gaze position at target onset on eye-hand coordination and reaching performance. Experiment 1 showed that with eyes and hand aligned on the same peripheral start location, time lags between eye and hand onsets were small and initiation times were substantially correlated, suggesting simultaneous control and tight eye-hand coupling. With eyes and hand departing from different start locations (gaze aligned with the center of the range of possible target positions), time lags between eye and hand onsets were large and initiation times were largely uncorrelated, suggesting independent control and decoupling of eye and hand movements. Furthermore, initial gaze position strongly mediated manual reaching performance indexed by increments in movement time as a function of target distance. Experiment 2 confirmed the impact of target foveation in modulating the effect of target distance on movement time. Our findings reveal the operation of an overarching, flexible neural control system that tunes the operation and cooperation of saccadic and manual control systems depending on where the eyes look at target onset. |
Robert Adam; Paul M Bays; Masud Husain Rapid decision-making under risk Journal Article Cognitive Neuroscience, 3 (1), pp. 52–61, 2012. Abstract | BibTeX @article{Adam2012a,
title = {Rapid decision-making under risk},
author = {Robert Adam and Paul M Bays and Masud Husain},
year = {2012},
date = {2012-01-01},
journal = {Cognitive Neuroscience},
volume = {3},
number = {1},
pages = {52--61},
abstract = {Impulsivity is often characterized by rapid decisions under risk, but most current tests of decision-making do not impose time pressures on participants' choices. Here we introduce a new Traffic Lights test which requires people to choose whether to programme a risky, early eye movement before a traffic light turns green (earning them high rewards or a penalty) or wait for the green light before responding to obtain a small reward instead. Young participants demonstrated bimodal responses: an early, high-risk and a later, low-risk set of choices. By contrast, elderly people invariably waited for the green light and showed little risk-taking. Performance could be modelled as a race between two rise-to-threshold decision processes, one triggered by the green light and the other initiated before it. The test provides a useful measure of rapid decision-making under risk, with the potential to reveal how this process alters with aging or in patient groups.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Impulsivity is often characterized by rapid decisions under risk, but most current tests of decision-making do not impose time pressures on participants' choices. Here we introduce a new Traffic Lights test which requires people to choose whether to programme a risky, early eye movement before a traffic light turns green (earning them high rewards or a penalty) or wait for the green light before responding to obtain a small reward instead. Young participants demonstrated bimodal responses: an early, high-risk and a later, low-risk set of choices. By contrast, elderly people invariably waited for the green light and showed little risk-taking. Performance could be modelled as a race between two rise-to-threshold decision processes, one triggered by the green light and the other initiated before it. The test provides a useful measure of rapid decision-making under risk, with the potential to reveal how this process alters with aging or in patient groups. |
Jos J Adam; Thamar J H Bovend'Eerdt; Fren T Y Smulders; Pascal W M Van Gerven Strategic flexibility in response preparation: Effects of cue validity on reaction time and pupil dilation Journal Article Journal of Cognitive Psychology, 26 (2), pp. 166–177, 2014. Abstract | Links | BibTeX @article{Adam2014,
title = {Strategic flexibility in response preparation: Effects of cue validity on reaction time and pupil dilation},
author = {Jos J Adam and Thamar J H Bovend'Eerdt and Fren T Y Smulders and Pascal W M {Van Gerven}},
doi = {10.1080/20445911.2014.883399},
year = {2014},
date = {2014-01-01},
journal = {Journal of Cognitive Psychology},
volume = {26},
number = {2},
pages = {166--177},
abstract = {This study examined the ability of participants to strategically adapt their level of response preparation to the predictive value of preparatory cues. Participants performed the finger-precuing task under three levels of cue validity: 100, 75 and 50% valid. Response preparation was indexed by means of reaction time (RT) and pupil dilation, the latter providing a psychophysiological index of invested effort. Results showed a systematic increase in RT benefits (generated by valid cues) and RT costs (generated by invalid cues) with increments in the predictive value of cues. Converging with these behavioural effects, pupil dilation also increased systematically with greater cue validity during the cue-stimulus interval, suggesting more effortful response preparation with increases in cue validity. Together, these findings confirm the hypothesis that response preparation is flexible and that it can be strategically allocated in proportion to the relative frequency of valid/invalid preparatory cues.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This study examined the ability of participants to strategically adapt their level of response preparation to the predictive value of preparatory cues. Participants performed the finger-precuing task under three levels of cue validity: 100, 75 and 50% valid. Response preparation was indexed by means of reaction time (RT) and pupil dilation, the latter providing a psychophysiological index of invested effort. Results showed a systematic increase in RT benefits (generated by valid cues) and RT costs (generated by invalid cues) with increments in the predictive value of cues. Converging with these behavioural effects, pupil dilation also increased systematically with greater cue validity during the cue-stimulus interval, suggesting more effortful response preparation with increases in cue validity. Together, these findings confirm the hypothesis that response preparation is flexible and that it can be strategically allocated in proportion to the relative frequency of valid/invalid preparatory cues. |
Hossein Adeli; Françoise Vitu; Gregory J Zelinsky A model of the superior colliculus predicts fixation locations during scene viewing and visual aearch Journal Article Journal of Neuroscience, 37 (6), pp. 1453–1467, 2017. Abstract | Links | BibTeX @article{Adeli2017,
title = {A model of the superior colliculus predicts fixation locations during scene viewing and visual aearch},
author = {Hossein Adeli and Fran{ç}oise Vitu and Gregory J Zelinsky},
url = {http://www.jneurosci.org/lookup/doi/10.1523/JNEUROSCI.0825-16.2016},
doi = {10.1523/JNEUROSCI.0825-16.2016},
year = {2017},
date = {2017-01-01},
journal = {Journal of Neuroscience},
volume = {37},
number = {6},
pages = {1453--1467},
abstract = {Modern computational models of attention predict fixations using saliency maps and target maps, which prioritize locations for fixation based on feature contrast and target goals, respectively. But whereas many such models are biologically plausible, none have looked to the oculomotor system for design constraints or parameter specification. Conversely, although most models of saccade programming are tightly coupled to underlying neurophysiology, none have been tested using real-world stimuli and tasks. We combined the strengths of these two approaches in MASC, a model of attention in the superior colliculus (SC) that captures known neurophysiological constraints on saccade programming. We show that MASC predicted the fixation locations of humans freely viewing naturalistic scenes and performing exemplar and categorical search tasks, a breadth achieved by no other existing model. Moreover, it did this as well or better than its more specialized state-of-the-art competitors. MASC's predictive success stems from its inclusion of high-level but core principles of SC organization: an over-representation of foveal information, size-invariant population codes, cascaded population averaging over distorted visual and motor maps, and competition between motor point images for saccade programming, all of which cause further modulation of priority (attention) after projection of saliency and target maps to the SC. Only by incorporating these organizing brain principles into our models can we fully understand the transformation of complex visual information into the saccade programs underlying movements of overt attention. With MASC, a theoretical footing now exists to generate and test computationally explicit predictions of behavioral and neural responses in visually complex real-world contexts.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Modern computational models of attention predict fixations using saliency maps and target maps, which prioritize locations for fixation based on feature contrast and target goals, respectively. But whereas many such models are biologically plausible, none have looked to the oculomotor system for design constraints or parameter specification. Conversely, although most models of saccade programming are tightly coupled to underlying neurophysiology, none have been tested using real-world stimuli and tasks. We combined the strengths of these two approaches in MASC, a model of attention in the superior colliculus (SC) that captures known neurophysiological constraints on saccade programming. We show that MASC predicted the fixation locations of humans freely viewing naturalistic scenes and performing exemplar and categorical search tasks, a breadth achieved by no other existing model. Moreover, it did this as well or better than its more specialized state-of-the-art competitors. MASC's predictive success stems from its inclusion of high-level but core principles of SC organization: an over-representation of foveal information, size-invariant population codes, cascaded population averaging over distorted visual and motor maps, and competition between motor point images for saccade programming, all of which cause further modulation of priority (attention) after projection of saliency and target maps to the SC. Only by incorporating these organizing brain principles into our models can we fully understand the transformation of complex visual information into the saccade programs underlying movements of overt attention. With MASC, a theoretical footing now exists to generate and test computationally explicit predictions of behavioral and neural responses in visually complex real-world contexts. |
Arash Afraz; Patrick Cavanagh The gender-specific face aftereffect is based in retinotopic not spatiotopic coordinates across several natural image transformations Journal Article Journal of Vision, 9 (10), pp. 1–17, 2009. Abstract | Links | BibTeX @article{Afraz2009,
title = {The gender-specific face aftereffect is based in retinotopic not spatiotopic coordinates across several natural image transformations},
author = {Arash Afraz and Patrick Cavanagh},
url = {http://jov.arvojournals.org/Article.aspx?doi=10.1167/9.10.10},
doi = {10.1167/9.10.10},
year = {2009},
date = {2009-01-01},
journal = {Journal of Vision},
volume = {9},
number = {10},
pages = {1--17},
abstract = {In four experiments, we measured the gender-specific face-aftereffect following subject's eye movement, head rotation, or head movement toward the display and following movement of the adapting stimulus itself to a new test location. In all experiments, the face aftereffect was strongest at the retinal position, orientation, and size of the adaptor. There was no advantage for the spatiotopic location in any experiment nor was there an advantage for the location newly occupied by the adapting face after it moved in the final experiment. Nevertheless, the aftereffect showed a broad gradient of transfer across location, orientation and size that, although centered on the retinotopic values of the adapting stimulus, covered ranges far exceeding the tuning bandwidths of neurons in early visual cortices. These results are consistent with a high-level site of adaptation (e.g. FFA) where units of face analysis have modest coverage of visual field, centered in retinotopic coordinates, but relatively broad tolerance for variations in size and orientation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In four experiments, we measured the gender-specific face-aftereffect following subject's eye movement, head rotation, or head movement toward the display and following movement of the adapting stimulus itself to a new test location. In all experiments, the face aftereffect was strongest at the retinal position, orientation, and size of the adaptor. There was no advantage for the spatiotopic location in any experiment nor was there an advantage for the location newly occupied by the adapting face after it moved in the final experiment. Nevertheless, the aftereffect showed a broad gradient of transfer across location, orientation and size that, although centered on the retinotopic values of the adapting stimulus, covered ranges far exceeding the tuning bandwidths of neurons in early visual cortices. These results are consistent with a high-level site of adaptation (e.g. FFA) where units of face analysis have modest coverage of visual field, centered in retinotopic coordinates, but relatively broad tolerance for variations in size and orientation. |
Zaeinab Afsari; José P Ossandón; Peter Konig The dynamic effect of reading direction habit on spatial asymmetry of image perception Journal Article Journal of Vision, 16 (11), pp. 1–21, 2016. Abstract | Links | BibTeX @article{Afsari2016,
title = {The dynamic effect of reading direction habit on spatial asymmetry of image perception},
author = {Zaeinab Afsari and José P Ossandón and Peter Konig},
doi = {10.1167/16.11.8.doi},
year = {2016},
date = {2016-01-01},
journal = {Journal of Vision},
volume = {16},
number = {11},
pages = {1--21},
abstract = {Exploration of images after stimulus onset is initially biased to the left. Here, we studied the causes of such an asymmetry and investigated effects of reading habits, text primes, and priming by systematically biased eye movements on this spatial bias in visual exploration. Bilinguals first read text primes with right- to-left (RTL) or left-to-right (LTR) reading directions and subsequently explored natural images. In Experiment 1, native RTL speakers showed a leftward free-viewing shift after reading LTR primes but a weaker rightward bias after reading RTL primes. This demonstrates that reading direction dynamically influences the spatial bias. However, native LTR speakers wholearnedanRTL languagelateinlife showed a leftward bias after reading either LTR or RTL primes, which suggests the role of habit formation in the production of the spatial bias. In Experiment 2, LTR bilinguals showed a slightly enhanced leftward bias after reading LTR text primes in their second language. This might contribute to the differences of native RTL and LTR speakers observed in Experiment 1. In Experiment 3, LTR bilinguals read normal (LTR, habitual reading) and mirrored left-to-right (mLTR, nonhabitual reading) texts. We observed a strong leftward bias in both cases, indicating that the bias direction is influenced by habitual reading direction and is not secondary to the actual reading direction. This is confirmed in Experiment 4, in which LTR participants were asked to follow RTL and LTR moving dots in prior image presentation and showed no change in the normal spatial bias. In conclusion, the horizontal bias is a dynamic property and is modulated by habitual reading direction. Introduction},
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Exploration of images after stimulus onset is initially biased to the left. Here, we studied the causes of such an asymmetry and investigated effects of reading habits, text primes, and priming by systematically biased eye movements on this spatial bias in visual exploration. Bilinguals first read text primes with right- to-left (RTL) or left-to-right (LTR) reading directions and subsequently explored natural images. In Experiment 1, native RTL speakers showed a leftward free-viewing shift after reading LTR primes but a weaker rightward bias after reading RTL primes. This demonstrates that reading direction dynamically influences the spatial bias. However, native LTR speakers wholearnedanRTL languagelateinlife showed a leftward bias after reading either LTR or RTL primes, which suggests the role of habit formation in the production of the spatial bias. In Experiment 2, LTR bilinguals showed a slightly enhanced leftward bias after reading LTR text primes in their second language. This might contribute to the differences of native RTL and LTR speakers observed in Experiment 1. In Experiment 3, LTR bilinguals read normal (LTR, habitual reading) and mirrored left-to-right (mLTR, nonhabitual reading) texts. We observed a strong leftward bias in both cases, indicating that the bias direction is influenced by habitual reading direction and is not secondary to the actual reading direction. This is confirmed in Experiment 4, in which LTR participants were asked to follow RTL and LTR moving dots in prior image presentation and showed no change in the normal spatial bias. In conclusion, the horizontal bias is a dynamic property and is modulated by habitual reading direction. Introduction |
Mehmet N Ağaoğlu; Michael H Herzog; Haluk Öğmen Field-like interactions between motion-based reference frames Journal Article Attention, Perception, and Psychophysics, 77 (6), pp. 2082–2097, 2015. Abstract | Links | BibTeX @article{Agaoglu2015,
title = {Field-like interactions between motion-based reference frames},
author = {Mehmet N Ağaoğlu and Michael H Herzog and Haluk Öğmen},
doi = {10.3758/s13414-015-0890-9},
year = {2015},
date = {2015-01-01},
journal = {Attention, Perception, and Psychophysics},
volume = {77},
number = {6},
pages = {2082--2097},
abstract = {A reference frame is required to specify how motion is perceived. For example, the motion ofpart ofan object is usually perceived relative to the motion of the object itself. Johansson (Psychological Research, 38,379–393, 1976)pro-posed that the perceptual system carries out a vector decomposition, which rewsults in common and relative motion percepts. Because vector decomposition is an ill-posed problem, several studies have introduced constraints by means ofwhich the number of solutions can be substantially reduced. Here, we have adopted an alternative approach and studied how, rather than why, a subset ofsolutions is selected by the visual system. We propose that each retinotopic motion vector creates a reference-frame field in the retinotopic space, and that the fields created by different motion vectors interact in order to determine a motion vector that will serve as the reference frame at a given point and time in space. To test this theory, we performed a set ofpsychophysical experiments. The field-like influence of motion-based reference frames was manifested by increased nonspatiotopic percepts of the backward motion of a target square with decreasing distance from a drifting grating. We then sought to determine whether these field-like effects ofmotion-based reference frames can also be extended to stationary landmarks. The results suggest that reference-field interactions occur only between motion-generated fields. Finally, we investigated whether and how different reference fields interact with each other, and found that different reference-field interactions are nonlinear and depend on how the motion vectors are grouped. These findings are discussed from the perspective ofthe reference-frame metric field (RFMF) theory, according to which perceptual grouping operations play a central and essential role in determining the prevailing reference frames.},
keywords = {},
pubstate = {published},
tppubtype = {article}
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A reference frame is required to specify how motion is perceived. For example, the motion ofpart ofan object is usually perceived relative to the motion of the object itself. Johansson (Psychological Research, 38,379–393, 1976)pro-posed that the perceptual system carries out a vector decomposition, which rewsults in common and relative motion percepts. Because vector decomposition is an ill-posed problem, several studies have introduced constraints by means ofwhich the number of solutions can be substantially reduced. Here, we have adopted an alternative approach and studied how, rather than why, a subset ofsolutions is selected by the visual system. We propose that each retinotopic motion vector creates a reference-frame field in the retinotopic space, and that the fields created by different motion vectors interact in order to determine a motion vector that will serve as the reference frame at a given point and time in space. To test this theory, we performed a set ofpsychophysical experiments. The field-like influence of motion-based reference frames was manifested by increased nonspatiotopic percepts of the backward motion of a target square with decreasing distance from a drifting grating. We then sought to determine whether these field-like effects ofmotion-based reference frames can also be extended to stationary landmarks. The results suggest that reference-field interactions occur only between motion-generated fields. Finally, we investigated whether and how different reference fields interact with each other, and found that different reference-field interactions are nonlinear and depend on how the motion vectors are grouped. These findings are discussed from the perspective ofthe reference-frame metric field (RFMF) theory, according to which perceptual grouping operations play a central and essential role in determining the prevailing reference frames. |
Mehmet N Ağaoğlu; Michael H Herzog; Haluk Öğmen The effective reference frame in perceptual judgments of motion direction Journal Article Vision Research, 107 , pp. 101–112, 2015. Abstract | Links | BibTeX @article{Agaoglu2015a,
title = {The effective reference frame in perceptual judgments of motion direction},
author = {Mehmet N Ağaoğlu and Michael H Herzog and Haluk Öğmen},
doi = {10.1016/j.visres.2014.12.009},
year = {2015},
date = {2015-01-01},
journal = {Vision Research},
volume = {107},
pages = {101--112},
abstract = {The retinotopic projection of stimulus motion depends both on the motion of the stimulus and the movements of the observer. In this study, we aimed to quantify the contributions of endogenous (retinotopic) and exogenous (spatiotopic and motion-based) reference frames on judgments of motion direction. We used a variant of the induced motion paradigm and we created different experimental conditions in which the predictions of each reference frame were different. Finally, assuming additive contributions from different reference frames, we used a linear model to account for the data. Our results suggest that the effective reference frame for motion perception emerges from an amalgamation of motion-based, retinotopic and spatiotopic reference frames. In determining the percept, the influence of relative motion, defined by a motion-based reference frame, dominates those of retinotopic and spatiotopic motions within a finite region. We interpret these findings within the context of the Reference Frame Metric Field (RFMF) theory, which states that local motion vectors might have perceptual reference-frame fields associated with them, and interactions between these fields determine the selection of the effective reference frame.},
keywords = {},
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The retinotopic projection of stimulus motion depends both on the motion of the stimulus and the movements of the observer. In this study, we aimed to quantify the contributions of endogenous (retinotopic) and exogenous (spatiotopic and motion-based) reference frames on judgments of motion direction. We used a variant of the induced motion paradigm and we created different experimental conditions in which the predictions of each reference frame were different. Finally, assuming additive contributions from different reference frames, we used a linear model to account for the data. Our results suggest that the effective reference frame for motion perception emerges from an amalgamation of motion-based, retinotopic and spatiotopic reference frames. In determining the percept, the influence of relative motion, defined by a motion-based reference frame, dominates those of retinotopic and spatiotopic motions within a finite region. We interpret these findings within the context of the Reference Frame Metric Field (RFMF) theory, which states that local motion vectors might have perceptual reference-frame fields associated with them, and interactions between these fields determine the selection of the effective reference frame. |
Mehmet N Ağaoğlu; Susana T L Chung Can (should) theories of crowding be unified? Journal Article Journal of Vision, 16 (15), pp. 1–22, 2016. Abstract | Links | BibTeX @article{Agaoglu2016,
title = {Can (should) theories of crowding be unified?},
author = {Mehmet N Ağaoğlu and Susana T L Chung},
url = {http://jov.arvojournals.org/article.aspx?doi=10.1167/16.15.10},
doi = {10.1167/16.15.10},
year = {2016},
date = {2016-01-01},
journal = {Journal of Vision},
volume = {16},
number = {15},
pages = {1--22},
abstract = {Objects in clutter are difficult to recognize, a phenomenon known as crowding. There is little consensus on the underlying mechanisms of crowding, and a large number of models have been proposed. There have also been attempts at unifying the explanations of crowding under a single model, such as the weighted feature model of Harrison and Bex (2015) and the texture synthesis model of Rosenholtz and colleagues (Balas, Nakano, & Rosenholtz, 2009; Keshvari & Rosenholtz, 2016). The goal of this work was to test various models of crowding and to assess whether a unifying account can be developed. Adopting Harrison and Bex's (2015) experimental paradigm, we asked observers to report the orientation of two concentric C-stimuli. Contrary to the predictions of their model, observers' recognition accuracy was worse for the inner C-stimulus. In addition, we demonstrated that the stimulus paradigm used by Harrison and Bex has a crucial confounding factor, eccentricity, which limits its usage to a very narrow range of stimulus parameters. Nevertheless, reporting the orientations of both C-stimuli in this paradigm proved very useful in pitting different crowding models against each other. Specifically, we tested deterministic and probabilistic versions of averaging, substitution, and attentional resolution models as well as the texture synthesis model. None of the models alone was able to explain the entire set of data. Based on these findings, we discuss whether the explanations of crowding can (should) be unified.},
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Objects in clutter are difficult to recognize, a phenomenon known as crowding. There is little consensus on the underlying mechanisms of crowding, and a large number of models have been proposed. There have also been attempts at unifying the explanations of crowding under a single model, such as the weighted feature model of Harrison and Bex (2015) and the texture synthesis model of Rosenholtz and colleagues (Balas, Nakano, & Rosenholtz, 2009; Keshvari & Rosenholtz, 2016). The goal of this work was to test various models of crowding and to assess whether a unifying account can be developed. Adopting Harrison and Bex's (2015) experimental paradigm, we asked observers to report the orientation of two concentric C-stimuli. Contrary to the predictions of their model, observers' recognition accuracy was worse for the inner C-stimulus. In addition, we demonstrated that the stimulus paradigm used by Harrison and Bex has a crucial confounding factor, eccentricity, which limits its usage to a very narrow range of stimulus parameters. Nevertheless, reporting the orientations of both C-stimuli in this paradigm proved very useful in pitting different crowding models against each other. Specifically, we tested deterministic and probabilistic versions of averaging, substitution, and attentional resolution models as well as the texture synthesis model. None of the models alone was able to explain the entire set of data. Based on these findings, we discuss whether the explanations of crowding can (should) be unified. |
Mehmet N Ağaoğlu; Aaron M Clarke; Michael H Herzog; Haluk Ögmen Motion-based nearest vector metric for reference frame selection in the perception of motion Journal Article Journal of Vision, 16 (7), pp. 1–16, 2016. Abstract | Links | BibTeX @article{Agaoglu2016a,
title = {Motion-based nearest vector metric for reference frame selection in the perception of motion},
author = {Mehmet N Ağaoğlu and Aaron M Clarke and Michael H Herzog and Haluk Ögmen},
url = {http://jov.arvojournals.org/article.aspx?articleid=2524148},
doi = {10.1167/16.7.14},
year = {2016},
date = {2016-01-01},
journal = {Journal of Vision},
volume = {16},
number = {7},
pages = {1--16},
abstract = {We investigated how the visual system selects a reference frame for the perception of motion. Two concentric arcs underwent circular motion around the center of the display, where observers fixated. The outer (target) arc's angular velocity profile was modulated by a sine wave midflight whereas the inner (reference) arc moved at a constant angular speed. The task was to report whether the target reversed its direction of motion at any point during its motion. We investigated the effects of spatial and figural factors by systematically varying the radial and angular distances between the arcs, and their relative sizes. We found that the effectiveness of the reference frame decreases with increasing radial- and angular-distance measures. Drastic changes in the relative sizes of the arcs did not influence motion reversal thresholds, suggesting no influence of stimulus form on perceived motion. We also investigated the effect of common velocity by introducing velocity fluctuations to the reference arc as well. We found no effect of whether or not a reference frame has a constant motion. We examined several form- and motion-based metrics, which could potentially unify our findings. We found that a motion-based nearest vector metric can fully account for all the data reported here. These findings suggest that the selection of reference frames for motion processing does not result from a winner-take-all process, but instead, can be explained by a field whose strength decreases with the distance between the nearest motion vectors regardless of the form of the moving objects.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We investigated how the visual system selects a reference frame for the perception of motion. Two concentric arcs underwent circular motion around the center of the display, where observers fixated. The outer (target) arc's angular velocity profile was modulated by a sine wave midflight whereas the inner (reference) arc moved at a constant angular speed. The task was to report whether the target reversed its direction of motion at any point during its motion. We investigated the effects of spatial and figural factors by systematically varying the radial and angular distances between the arcs, and their relative sizes. We found that the effectiveness of the reference frame decreases with increasing radial- and angular-distance measures. Drastic changes in the relative sizes of the arcs did not influence motion reversal thresholds, suggesting no influence of stimulus form on perceived motion. We also investigated the effect of common velocity by introducing velocity fluctuations to the reference arc as well. We found no effect of whether or not a reference frame has a constant motion. We examined several form- and motion-based metrics, which could potentially unify our findings. We found that a motion-based nearest vector metric can fully account for all the data reported here. These findings suggest that the selection of reference frames for motion processing does not result from a winner-take-all process, but instead, can be explained by a field whose strength decreases with the distance between the nearest motion vectors regardless of the form of the moving objects. |
Mehmet N Ağaoğlu; Haluk Öğmen; Susana T L Chung Unmasking saccadic uncrowding Journal Article Vision Research, 127 , pp. 152–164, 2016. Abstract | Links | BibTeX @article{Agaoglu2016b,
title = {Unmasking saccadic uncrowding},
author = {Mehmet N Ağaoğlu and Haluk Öğmen and Susana T L Chung},
doi = {10.1016/j.visres.2016.08.003},
year = {2016},
date = {2016-01-01},
journal = {Vision Research},
volume = {127},
pages = {152--164},
abstract = {Stimuli that are briefly presented around the time of saccades are often perceived with spatiotemporal distortions. These distortions do not always have deleterious effects on the visibility and identification of a stimulus. Recent studies reported that when a stimulus is the target of an intended saccade, it is released from both masking and crowding. Here, we investigated pre-saccadic changes in single and crowded letter recognition performance in the absence (Experiment 1) and the presence (Experiment 2) of backward masks to determine the extent to which saccadic “uncrowding” and “unmasking” mechanisms are similar. Our results show that pre-saccadic improvements in letter recognition performance are mostly due to the presence of masks and/or stimulus transients which occur after the target is presented. More importantly, we did not find any decrease in crowding strength before impending saccades. A simplified version of a dual-channel neural model, originally proposed to explain masking phenomena, with several saccadic add-on mechanisms, could account for our results in Experiment 1. However, this model falls short in explaining how saccades drastically reduced the effect of backward masking (Experiment 2). The addition of a remapping mechanism that alters the relative spatial positions of stimuli was needed to fully account for the improvements observed when backward masks followed the letter stimuli. Taken together, our results (i) are inconsistent with saccadic uncrowding, (ii) strongly support saccadic unmasking, and (iii) suggest that pre-saccadic letter recognition is modulated by multiple perisaccadic mechanisms with different time courses.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Stimuli that are briefly presented around the time of saccades are often perceived with spatiotemporal distortions. These distortions do not always have deleterious effects on the visibility and identification of a stimulus. Recent studies reported that when a stimulus is the target of an intended saccade, it is released from both masking and crowding. Here, we investigated pre-saccadic changes in single and crowded letter recognition performance in the absence (Experiment 1) and the presence (Experiment 2) of backward masks to determine the extent to which saccadic “uncrowding” and “unmasking” mechanisms are similar. Our results show that pre-saccadic improvements in letter recognition performance are mostly due to the presence of masks and/or stimulus transients which occur after the target is presented. More importantly, we did not find any decrease in crowding strength before impending saccades. A simplified version of a dual-channel neural model, originally proposed to explain masking phenomena, with several saccadic add-on mechanisms, could account for our results in Experiment 1. However, this model falls short in explaining how saccades drastically reduced the effect of backward masking (Experiment 2). The addition of a remapping mechanism that alters the relative spatial positions of stimuli was needed to fully account for the improvements observed when backward masks followed the letter stimuli. Taken together, our results (i) are inconsistent with saccadic uncrowding, (ii) strongly support saccadic unmasking, and (iii) suggest that pre-saccadic letter recognition is modulated by multiple perisaccadic mechanisms with different time courses. |
Mehmet N Ağaoğlu; Susana T L Chung Interaction between stimulus contrast and pre-saccadic crowding Journal Article Royal Society Open Science, 4 (2), pp. 1–17, 2017. Abstract | Links | BibTeX @article{Agaoglu2017,
title = {Interaction between stimulus contrast and pre-saccadic crowding},
author = {Mehmet N Ağaoğlu and Susana T L Chung},
url = {http://dx.doi.org/10.1098/rsos.160559},
doi = {10.1098/rsos.160559},
year = {2017},
date = {2017-01-01},
journal = {Royal Society Open Science},
volume = {4},
number = {2},
pages = {1--17},
abstract = {Objects that are briefly flashed around the time of saccades are mislocalized. Previously, robust interactions between saccadic perceptual distortions and stimulus contrast have been reported. It is also known that crowding depends on the contrast of the target and flankers. Here, we investigated how stimulus contrast and crowding interact with pre-saccadic perception. We asked observers to report the orientation of a tilted Gabor presented in the periphery, with or without four flanking vertically oriented Gabors. Observers performed the task either following a saccade or while maintaining fixation. Contrasts of the target and flankers were independently set to either high or low, with equal probability. In both the fixation and saccade conditions, the flanked conditions resulted in worse discrimination performance—the crowding effect. In the unflanked saccade trials, performance significantly decreased with target-to-saccade onset for low-contrast targets but not for high-contrast targets. In the presence of flankers, impending saccades reduced performance only for low-contrast, but not for high-contrast flankers. Interestingly, average performance in the fixation and saccade conditions was mostly similar in all contrast conditions. Moreover, the magnitude of crowding was influenced by saccades only when the target had high contrast and the flankers had low contrasts. Overall, our results are consistent with modulation of perisaccadic spatial localization by contrast and saccadic suppression, but at odds with a recent report of pre-saccadic release of crowding.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Objects that are briefly flashed around the time of saccades are mislocalized. Previously, robust interactions between saccadic perceptual distortions and stimulus contrast have been reported. It is also known that crowding depends on the contrast of the target and flankers. Here, we investigated how stimulus contrast and crowding interact with pre-saccadic perception. We asked observers to report the orientation of a tilted Gabor presented in the periphery, with or without four flanking vertically oriented Gabors. Observers performed the task either following a saccade or while maintaining fixation. Contrasts of the target and flankers were independently set to either high or low, with equal probability. In both the fixation and saccade conditions, the flanked conditions resulted in worse discrimination performance—the crowding effect. In the unflanked saccade trials, performance significantly decreased with target-to-saccade onset for low-contrast targets but not for high-contrast targets. In the presence of flankers, impending saccades reduced performance only for low-contrast, but not for high-contrast flankers. Interestingly, average performance in the fixation and saccade conditions was mostly similar in all contrast conditions. Moreover, the magnitude of crowding was influenced by saccades only when the target had high contrast and the flankers had low contrasts. Overall, our results are consistent with modulation of perisaccadic spatial localization by contrast and saccadic suppression, but at odds with a recent report of pre-saccadic release of crowding. |
Dimitris Agrafiotis; Nishan Canagarajah; David R Bull; Matthew Dye Perceptually optimised sign language video coding based on eye tracking analysis Journal Article Electronics Letters, 39 , pp. 1–2, 2003. Abstract | Links | BibTeX @article{Agrafiotis2003,
title = {Perceptually optimised sign language video coding based on eye tracking analysis},
author = {Dimitris Agrafiotis and Nishan Canagarajah and David R Bull and Matthew Dye},
doi = {10.1049/el},
year = {2003},
date = {2003-01-01},
journal = {Electronics Letters},
volume = {39},
pages = {1--2},
abstract = {A perceptually optimised approach to sign language video coding is presented. The proposed approach is based on the results (included) of an eye tracking study in the visual attention of sign language viewers. Results show reductions in bit rate of over 30% with very good subjective quality.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A perceptually optimised approach to sign language video coding is presented. The proposed approach is based on the results (included) of an eye tracking study in the visual attention of sign language viewers. Results show reductions in bit rate of over 30% with very good subjective quality. |
Carlos Aguilar; Eric Castet Gaze-contingent simulation of retinopathy: Some potential pitfalls and remedies Journal Article Vision Research, 51 (9), pp. 997–1012, 2011. Abstract | Links | BibTeX @article{Aguilar2011,
title = {Gaze-contingent simulation of retinopathy: Some potential pitfalls and remedies},
author = {Carlos Aguilar and Eric Castet},
url = {http://dx.doi.org/10.1016/j.visres.2011.02.010},
doi = {10.1016/j.visres.2011.02.010},
year = {2011},
date = {2011-01-01},
journal = {Vision Research},
volume = {51},
number = {9},
pages = {997--1012},
publisher = {Elsevier Ltd},
abstract = {Many important results in visual neuroscience rely on the use of gaze-contingent retinal stabilization techniques. Our work focuses on the important fraction of these studies that is concerned with the retinal stabilization of visual filters that degrade some specific portions of the visual field. For instance, macular scotomas, often induced by age related macular degeneration, can be simulated by continuously displaying a gaze-contingent mask in the center of the visual field. The gaze-contingent rules used in most of these studies imply only a very minimal processing of ocular data. By analyzing the relationship between gaze and scotoma locations for different oculo-motor patterns, we show that such a minimal processing might have adverse perceptual and oculomotor consequences due mainly to two potential problems: (a) a transient blink-induced motion of the scotoma while gaze is static, and (b) the intrusion of post-saccadic slow eye movements. We have developed new gaze-contingent rules to solve these two problems. We have also suggested simple ways of tackling two unrecognized problems that are a potential source of mismatch between gaze and scotoma locations. Overall, the present work should help design, describe and test the paradigms used to simulate retinopathy with gaze-contingent displays.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Many important results in visual neuroscience rely on the use of gaze-contingent retinal stabilization techniques. Our work focuses on the important fraction of these studies that is concerned with the retinal stabilization of visual filters that degrade some specific portions of the visual field. For instance, macular scotomas, often induced by age related macular degeneration, can be simulated by continuously displaying a gaze-contingent mask in the center of the visual field. The gaze-contingent rules used in most of these studies imply only a very minimal processing of ocular data. By analyzing the relationship between gaze and scotoma locations for different oculo-motor patterns, we show that such a minimal processing might have adverse perceptual and oculomotor consequences due mainly to two potential problems: (a) a transient blink-induced motion of the scotoma while gaze is static, and (b) the intrusion of post-saccadic slow eye movements. We have developed new gaze-contingent rules to solve these two problems. We have also suggested simple ways of tackling two unrecognized problems that are a potential source of mismatch between gaze and scotoma locations. Overall, the present work should help design, describe and test the paradigms used to simulate retinopathy with gaze-contingent displays. |
Stephanie Ahken; Gilles Comeau; Sylvie Hébert; Ramesh Balasubramaniam Eye movement patterns during the processing of musical and linguistic syntactic incongruities. Journal Article Psychomusicology: Music, Mind, and Brain, 22 (1), pp. 18–25, 2012. Abstract | Links | BibTeX @article{Ahken2012,
title = {Eye movement patterns during the processing of musical and linguistic syntactic incongruities.},
author = {Stephanie Ahken and Gilles Comeau and Sylvie Hébert and Ramesh Balasubramaniam},
url = {http://doi.apa.org/getdoi.cfm?doi=10.1037/a0026751},
doi = {10.1037/a0026751},
year = {2012},
date = {2012-01-01},
journal = {Psychomusicology: Music, Mind, and Brain},
volume = {22},
number = {1},
pages = {18--25},
abstract = {It has been suggested that music and language share syntax-supporting brain mechanisms. Consequently, violations of syntax in either domain may have similar effects. The present study examined the effects of syntactic incongruities on eye movements and reading time in both music and language domains. In the music notation condition, the syntactic incongruities violated the prevailing musical tonality (i.e., the last bar of the incongruent sequence was a nontonic chord or nontonic note in the given key). In the linguistic condition, syntactic incongruities violated the expected grammatical structure (i.e., sentences with anomalies carrying the progressive –ing affix or the past tense inflection). Eighteen pianists were asked to sight-read and play musical phrases (music condition) and read sentences aloud (linguistic condition). Syntactic incongruities in both domains were associated with an increase in the mean proportion and duration of fixations in the target region of interest, as well as longer reading duration. The results are consistent with the growing evidence of a shared network of neural structures for syntactic processing, while not ruling out the possibility of independent networks for each domain.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
It has been suggested that music and language share syntax-supporting brain mechanisms. Consequently, violations of syntax in either domain may have similar effects. The present study examined the effects of syntactic incongruities on eye movements and reading time in both music and language domains. In the music notation condition, the syntactic incongruities violated the prevailing musical tonality (i.e., the last bar of the incongruent sequence was a nontonic chord or nontonic note in the given key). In the linguistic condition, syntactic incongruities violated the expected grammatical structure (i.e., sentences with anomalies carrying the progressive –ing affix or the past tense inflection). Eighteen pianists were asked to sight-read and play musical phrases (music condition) and read sentences aloud (linguistic condition). Syntactic incongruities in both domains were associated with an increase in the mean proportion and duration of fixations in the target region of interest, as well as longer reading duration. The results are consistent with the growing evidence of a shared network of neural structures for syntactic processing, while not ruling out the possibility of independent networks for each domain. |
Sheeraz Ahmad; He Huang; Angela J Yu Cost-sensitive Bayesian control policy in human active sensing Journal Article Frontiers in Human Neuroscience, 8 (December), pp. 1–12, 2014. Abstract | Links | BibTeX @article{Ahmad2014,
title = {Cost-sensitive Bayesian control policy in human active sensing},
author = {Sheeraz Ahmad and He Huang and Angela J Yu},
url = {http://journal.frontiersin.org/article/10.3389/fnhum.2014.00955/abstract},
doi = {10.3389/fnhum.2014.00955},
year = {2014},
date = {2014-01-01},
journal = {Frontiers in Human Neuroscience},
volume = {8},
number = {December},
pages = {1--12},
abstract = {An important but poorly understood aspect of sensory processing is the role of active sensing, the use of self-motion such as eye or head movements to focus sensing resources on the most rewarding or informative aspects of the sensory environment. Here, we present behavioral data from a visual search experiment, as well as a Bayesian model of within-trial dynamics of sensory processing and eye movements. Within this Bayes-optimal inference and control framework, which we call C-DAC (Context-Dependent Active Controller), various types of behavioral costs, such as temporal delay, response error, and sensor repositioning cost, are explicitly minimized. This contrasts with previously proposed algorithms that optimize abstract statistical objectives such as anticipated information gain (Infomax) (Butko and Movellan, 2010) and expected posterior maximum (greedy MAP) (Najemnik and Geisler, 2005). We find that C-DAC captures human visual search dynamics better than previous models, in particular a certain form of "confirmation bias" apparent in the way human subjects utilize prior knowledge about the spatial distribution of the search target to improve search speed and accuracy. We also examine several computationally efficient approximations to C-DAC that may present biologically more plausible accounts of the neural computations underlying active sensing, as well as practical tools for solving active sensing problems in engineering applications. To summarize, this paper makes the following key contributions: human visual search behavioral data, a context-sensitive Bayesian active sensing model, a comparative study between different models of human active sensing, and a family of efficient approximations to the optimal model.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
An important but poorly understood aspect of sensory processing is the role of active sensing, the use of self-motion such as eye or head movements to focus sensing resources on the most rewarding or informative aspects of the sensory environment. Here, we present behavioral data from a visual search experiment, as well as a Bayesian model of within-trial dynamics of sensory processing and eye movements. Within this Bayes-optimal inference and control framework, which we call C-DAC (Context-Dependent Active Controller), various types of behavioral costs, such as temporal delay, response error, and sensor repositioning cost, are explicitly minimized. This contrasts with previously proposed algorithms that optimize abstract statistical objectives such as anticipated information gain (Infomax) (Butko and Movellan, 2010) and expected posterior maximum (greedy MAP) (Najemnik and Geisler, 2005). We find that C-DAC captures human visual search dynamics better than previous models, in particular a certain form of "confirmation bias" apparent in the way human subjects utilize prior knowledge about the spatial distribution of the search target to improve search speed and accuracy. We also examine several computationally efficient approximations to C-DAC that may present biologically more plausible accounts of the neural computations underlying active sensing, as well as practical tools for solving active sensing problems in engineering applications. To summarize, this paper makes the following key contributions: human visual search behavioral data, a context-sensitive Bayesian active sensing model, a comparative study between different models of human active sensing, and a family of efficient approximations to the optimal model. |
Sara Ajina; Christopher Kennard; Geraint Rees; Holly Bridge Motion area V5/MT+ response to global motion in the absence of V1 resembles early visual cortex Journal Article Brain, 138 (1), pp. 164–178, 2015. Abstract | Links | BibTeX @article{Ajina2015,
title = {Motion area V5/MT+ response to global motion in the absence of V1 resembles early visual cortex},
author = {Sara Ajina and Christopher Kennard and Geraint Rees and Holly Bridge},
doi = {10.1093/brain/awu328},
year = {2015},
date = {2015-01-01},
journal = {Brain},
volume = {138},
number = {1},
pages = {164--178},
abstract = {Motion area V5/MT+ shows a variety of characteristic visual responses, often linked to perception, which are heavily influenced by its rich connectivity with the primary visual cortex (V1). This human motion area also receives a number of inputs from other visual regions, including direct subcortical connections and callosal connections with the contralateral hemisphere. Little is currently known about such alternative inputs to V5/MT+ and how they may drive and influence its activity. Using functional magnetic resonance imaging, the response of human V5/MT+ to increasing the proportion of coherent motion was measured in seven patients with unilateral V1 damage acquired during adulthood, and a group of healthy age-matched controls. When V1 was damaged, the typical V5/MT+ response to increasing coherence was lost. Rather, V5/MT+ in patients showed a negative trend with coherence that was similar to coherence-related activity in V1 of healthy control subjects. This shift to a response-pattern more typical of early visual cortex suggests that in the absence of V1, V5/MT+ activity may be shaped by similar direct subcortical input. This is likely to reflect intact residual pathways rather than a change in connectivity, and has important implications for blindsight function. It also confirms predictions that V1 is critically involved in normal V5/MT+ global motion processing, consistent with a convergent model of V1 input to V5/MT+. Historically, most attempts to model cortical visual responses do not consider the contribution of direct subcortical inputs that may bypass striate cortex, such as input to V5/MT+. We have shown that the signal change driven by these non-striate pathways can be measured, and suggest that models of the intact visual system may benefit from considering their contribution.},
keywords = {},
pubstate = {published},
tppubtype = {article}
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Motion area V5/MT+ shows a variety of characteristic visual responses, often linked to perception, which are heavily influenced by its rich connectivity with the primary visual cortex (V1). This human motion area also receives a number of inputs from other visual regions, including direct subcortical connections and callosal connections with the contralateral hemisphere. Little is currently known about such alternative inputs to V5/MT+ and how they may drive and influence its activity. Using functional magnetic resonance imaging, the response of human V5/MT+ to increasing the proportion of coherent motion was measured in seven patients with unilateral V1 damage acquired during adulthood, and a group of healthy age-matched controls. When V1 was damaged, the typical V5/MT+ response to increasing coherence was lost. Rather, V5/MT+ in patients showed a negative trend with coherence that was similar to coherence-related activity in V1 of healthy control subjects. This shift to a response-pattern more typical of early visual cortex suggests that in the absence of V1, V5/MT+ activity may be shaped by similar direct subcortical input. This is likely to reflect intact residual pathways rather than a change in connectivity, and has important implications for blindsight function. It also confirms predictions that V1 is critically involved in normal V5/MT+ global motion processing, consistent with a convergent model of V1 input to V5/MT+. Historically, most attempts to model cortical visual responses do not consider the contribution of direct subcortical inputs that may bypass striate cortex, such as input to V5/MT+. We have shown that the signal change driven by these non-striate pathways can be measured, and suggest that models of the intact visual system may benefit from considering their contribution. |
Başak Akdoğan; Fuat Balcı; Hedderik van Rijn Temporal expectation indexed by pupillary response Journal Article Timing & Time Perception, 4 , pp. 354–370, 2016. Abstract | Links | BibTeX @article{Akdogan2016,
title = {Temporal expectation indexed by pupillary response},
author = {Başak Akdoğan and Fuat Balcı and Hedderik van Rijn},
doi = {10.1163/22134468-00002075},
year = {2016},
date = {2016-01-01},
journal = {Timing & Time Perception},
volume = {4},
pages = {354--370},
abstract = {Forming temporal expectations plays an instrumental role for the optimization of behavior and allo- cation of attentional resources. Although the effects of temporal expectations on visual attention are well-established, the question of whether temporal predictions modulate the behavioral outputs of the autonomic nervous system such as the pupillary response remains unanswered. Therefore, this study aimed to obtain an online measure of pupil size while human participants were asked to dif- ferentiate between visual targets presented after varying time intervals since trial onset. Specifically, we manipulated temporal predictability in the presentation of target stimuli consisting of letters which appeared after either a short or long delay duration (1.5 vs. 3 s) in the majority of trials (75%) within different test blocks. In the remaining trials (25%), no target stimulus was present to investi- gate the trajectory of preparatory pupillary response under a low level of temporal uncertainty. The results revealed that the rate of preparatory pupillary response was contingent upon the time of target appearance such that pupils dilated at a higher rate when the targets were expected to appear after a shorter as compared to a longer delay period irrespective of target presence. The finding that pupil size can track temporal regularities and exhibit differential preparatory response between dif- ferent delay conditions points to the existence of a distributed neural network subserving temporal information processing which is crucial for cognitive functioning and goal-directed behavior.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Forming temporal expectations plays an instrumental role for the optimization of behavior and allo- cation of attentional resources. Although the effects of temporal expectations on visual attention are well-established, the question of whether temporal predictions modulate the behavioral outputs of the autonomic nervous system such as the pupillary response remains unanswered. Therefore, this study aimed to obtain an online measure of pupil size while human participants were asked to dif- ferentiate between visual targets presented after varying time intervals since trial onset. Specifically, we manipulated temporal predictability in the presentation of target stimuli consisting of letters which appeared after either a short or long delay duration (1.5 vs. 3 s) in the majority of trials (75%) within different test blocks. In the remaining trials (25%), no target stimulus was present to investi- gate the trajectory of preparatory pupillary response under a low level of temporal uncertainty. The results revealed that the rate of preparatory pupillary response was contingent upon the time of target appearance such that pupils dilated at a higher rate when the targets were expected to appear after a shorter as compared to a longer delay period irrespective of target presence. The finding that pupil size can track temporal regularities and exhibit differential preparatory response between dif- ferent delay conditions points to the existence of a distributed neural network subserving temporal information processing which is crucial for cognitive functioning and goal-directed behavior. |
Annika Åkerfelt; Hans Colonius; Adele Diederich Visual-tactile saccadic inhibition Journal Article Experimental Brain Research, 169 (4), pp. 554–563, 2006. Abstract | Links | BibTeX @article{Akerfelt2006,
title = {Visual-tactile saccadic inhibition},
author = {Annika Åkerfelt and Hans Colonius and Adele Diederich},
doi = {10.1007/s00221-005-0168-x},
year = {2006},
date = {2006-01-01},
journal = {Experimental Brain Research},
volume = {169},
number = {4},
pages = {554--563},
abstract = {In an eye movement countermanding paradigm it is demonstrated for the first time that a tactile stimulus can be an effective stop signal when human participants are to inhibit saccades to a visual target. Estimated stop signal processing times were 90-140 ms, comparable to results with auditory stop signals, but shorter than those commonly found for manual responses. Two of the three participants significantly slowed their reactions in expectation of the stop signal as revealed by a control experiment without stop signals. All participants produced slower responses in the shortest stop signal delay condition than predicted by the race model (Logan and Cowan 1984) along with hypometric saccades on stop failure trials, suggesting that the race model may need to be elaborated to include some component of interaction of stop and go signal processing.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In an eye movement countermanding paradigm it is demonstrated for the first time that a tactile stimulus can be an effective stop signal when human participants are to inhibit saccades to a visual target. Estimated stop signal processing times were 90-140 ms, comparable to results with auditory stop signals, but shorter than those commonly found for manual responses. Two of the three participants significantly slowed their reactions in expectation of the stop signal as revealed by a control experiment without stop signals. All participants produced slower responses in the shortest stop signal delay condition than predicted by the race model (Logan and Cowan 1984) along with hypometric saccades on stop failure trials, suggesting that the race model may need to be elaborated to include some component of interaction of stop and go signal processing. |
Ozgur E Akman; Richard A Clement; David S Broomhead; Sabira Mannan; Ian Moorhead; Hugh R Wilson Probing bottom-up processing with multistable images Journal Article Journal of Eye Movement Research, 1 (3), pp. 1–7, 2009. Abstract | Links | BibTeX @article{Akman2009,
title = {Probing bottom-up processing with multistable images},
author = {Ozgur E Akman and Richard A Clement and David S Broomhead and Sabira Mannan and Ian Moorhead and Hugh R Wilson},
url = {http://www.jemr.org/online/1/3/4},
year = {2009},
date = {2009-01-01},
journal = {Journal of Eye Movement Research},
volume = {1},
number = {3},
pages = {1--7},
abstract = {The selection of fixation targets involves a combination of top-down and bottom-up processing. The role of bottom-up processing can be enhanced by using multistable stimuli because their constantly changing appearance seems to depend predominantly on stimulusdriven factors. We used this approach to investigate whether visual processing models based on V1 need to be extended to incorporate specific computations attributed to V4. Eye movements of 8 subjects were recorded during free viewing of the Marroquin pattern in which illusory circles appear and disappear. Fixations were concentrated on features arranged in concentric rings within the pattern. Comparison with simulated fixation data demonstrated that the saliency of these features can be predicted with appropriate weighting of lateral connections in existing V1 models.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The selection of fixation targets involves a combination of top-down and bottom-up processing. The role of bottom-up processing can be enhanced by using multistable stimuli because their constantly changing appearance seems to depend predominantly on stimulusdriven factors. We used this approach to investigate whether visual processing models based on V1 need to be extended to incorporate specific computations attributed to V4. Eye movements of 8 subjects were recorded during free viewing of the Marroquin pattern in which illusory circles appear and disappear. Fixations were concentrated on features arranged in concentric rings within the pattern. Comparison with simulated fixation data demonstrated that the saliency of these features can be predicted with appropriate weighting of lateral connections in existing V1 models. |
Umair Akram; Jason G Ellis; Andriy Myachykov; Nicola L Barclay Preferential attention towards the eye-region amongst individuals with insomnia Journal Article Journal of Sleep Research, 26 (1), pp. 84–91, 2017. Abstract | Links | BibTeX @article{Akram2017,
title = {Preferential attention towards the eye-region amongst individuals with insomnia},
author = {Umair Akram and Jason G Ellis and Andriy Myachykov and Nicola L Barclay},
doi = {10.1111/jsr.12456},
year = {2017},
date = {2017-01-01},
journal = {Journal of Sleep Research},
volume = {26},
number = {1},
pages = {84--91},
abstract = {People with insomnia often perceive their own facial appearance as more tired compared with the appearance of others. Evidence also highlights the eye-region in projecting tiredness cues to perceivers, and tiredness judgements often rely on preferential attention towards this region. Using a novel eye-tracking paradigm, this study examined: (i) whether individuals with insomnia display preferential attention towards the eyeregion, relative to nose and mouth regions, whilst observing faces compared with normal-sleepers; and (ii) whether an attentional bias towards the eye-region amongst individuals with insomnia is self-specific or general in nature. Twenty individuals with DSM-5 Insomnia Disorder and 20 normal-sleepers viewed 48 neutral facial photographs (24 of themselves, 24 of other people) for periods of 4000 ms. Eye movements were recorded using eye-tracking, and first fixation onset, first fixation duration and total gaze duration were examined for three interest-regions (eyes, nose, mouth). Significant group 9 interest-region interactions indicated that, regardless of the face presented, participants with insomnia were quicker to attend to, and spent more time observing, the eye-region relative to the nose and mouth regions compared with normal-sleepers. However, no group 9 face 9 interest-region interactions were established. Thus, whilst individuals with insomnia displayed preferential attention towards the eye-region in general, this effect was not accentuated during self-perception. Insomnia appears to be characterized by a general, rather than self-specific, attentional bias towards the eye-region. These findings contribute to our understanding of face perception in insomnia, and provide tentative support for cognitive models of insomnia demonstrating that individuals with insomnia monitor faces in general, with a specific focus around the eye-region, for cues associated with tiredness.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
People with insomnia often perceive their own facial appearance as more tired compared with the appearance of others. Evidence also highlights the eye-region in projecting tiredness cues to perceivers, and tiredness judgements often rely on preferential attention towards this region. Using a novel eye-tracking paradigm, this study examined: (i) whether individuals with insomnia display preferential attention towards the eyeregion, relative to nose and mouth regions, whilst observing faces compared with normal-sleepers; and (ii) whether an attentional bias towards the eye-region amongst individuals with insomnia is self-specific or general in nature. Twenty individuals with DSM-5 Insomnia Disorder and 20 normal-sleepers viewed 48 neutral facial photographs (24 of themselves, 24 of other people) for periods of 4000 ms. Eye movements were recorded using eye-tracking, and first fixation onset, first fixation duration and total gaze duration were examined for three interest-regions (eyes, nose, mouth). Significant group 9 interest-region interactions indicated that, regardless of the face presented, participants with insomnia were quicker to attend to, and spent more time observing, the eye-region relative to the nose and mouth regions compared with normal-sleepers. However, no group 9 face 9 interest-region interactions were established. Thus, whilst individuals with insomnia displayed preferential attention towards the eye-region in general, this effect was not accentuated during self-perception. Insomnia appears to be characterized by a general, rather than self-specific, attentional bias towards the eye-region. These findings contribute to our understanding of face perception in insomnia, and provide tentative support for cognitive models of insomnia demonstrating that individuals with insomnia monitor faces in general, with a specific focus around the eye-region, for cues associated with tiredness. |
Andrea Alamia; Alexandre Zénon Statistical regularities attract attention when task-relevant Journal Article Frontiers in Human Neuroscience, 10 , pp. 1–10, 2016. Abstract | Links | BibTeX @article{Alamia2016,
title = {Statistical regularities attract attention when task-relevant},
author = {Andrea Alamia and Alexandre Zénon},
url = {http://journal.frontiersin.org/Article/10.3389/fnhum.2016.00042/abstract},
doi = {10.3389/fnhum.2016.00042},
year = {2016},
date = {2016-01-01},
journal = {Frontiers in Human Neuroscience},
volume = {10},
pages = {1--10},
abstract = {Visual attention seems essential for learning the statistical regularities in our environment, a process known as statistical learning. However, how attention is allocated when exploring a novel visual scene whose statistical structure is unknown remains unclear. In order to address this question, we investigated visual attention allocation during a task in which we manipulated the conditional probability of occurrence of colored stimuli, unbeknown to the subjects. Participants were instructed to detect a target colored dot among two dots moving along separate circular paths. We evaluated implicit statistical learning, i.e. the effect of color predictability on reaction times (RT), and recorded eye position concurrently. Attention allocation was indexed by comparing the Mahalanobis distance between the position, velocity and acceleration of the eyes and the 2 colored dots. We found that learning the conditional probabilities occurred very early during the course of the experiment as shown by the fact that, starting already from the first block, predictable stimuli were detected with shorter RT than unpredictable ones. In terms of attentional allocation, we found that the predictive stimulus attracted gaze only when it was informative about the occurrence of the target but not when it predicted the occurrence of a task-irrelevant stimulus. This suggests that attention allocation was influenced by regularities only when they were instrumental in performing the task. Moreover, we found that the attentional bias towards task-relevant predictive stimuli occurred at a very early stage of learning, concomitantly with the first effects of learning on RT. In conclusion, these results show that statistical regularities capture visual attention only after a few occurrences, provided these regularities are instrumental to perform the task.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Visual attention seems essential for learning the statistical regularities in our environment, a process known as statistical learning. However, how attention is allocated when exploring a novel visual scene whose statistical structure is unknown remains unclear. In order to address this question, we investigated visual attention allocation during a task in which we manipulated the conditional probability of occurrence of colored stimuli, unbeknown to the subjects. Participants were instructed to detect a target colored dot among two dots moving along separate circular paths. We evaluated implicit statistical learning, i.e. the effect of color predictability on reaction times (RT), and recorded eye position concurrently. Attention allocation was indexed by comparing the Mahalanobis distance between the position, velocity and acceleration of the eyes and the 2 colored dots. We found that learning the conditional probabilities occurred very early during the course of the experiment as shown by the fact that, starting already from the first block, predictable stimuli were detected with shorter RT than unpredictable ones. In terms of attentional allocation, we found that the predictive stimulus attracted gaze only when it was informative about the occurrence of the target but not when it predicted the occurrence of a task-irrelevant stimulus. This suggests that attention allocation was influenced by regularities only when they were instrumental in performing the task. Moreover, we found that the attentional bias towards task-relevant predictive stimuli occurred at a very early stage of learning, concomitantly with the first effects of learning on RT. In conclusion, these results show that statistical regularities capture visual attention only after a few occurrences, provided these regularities are instrumental to perform the task. |
Andrea Albonico; Manuela Malaspina; Emanuela Bricolo; Marialuisa Martelli; Roberta Daini Temporal dissociation between the focal and orientation components of spatial attention in central and peripheral vision Journal Article Acta Psychologica, 171 , pp. 85–92, 2016. Abstract | Links | BibTeX @article{Albonico2016,
title = {Temporal dissociation between the focal and orientation components of spatial attention in central and peripheral vision},
author = {Andrea Albonico and Manuela Malaspina and Emanuela Bricolo and Marialuisa Martelli and Roberta Daini},
url = {http://dx.doi.org/10.1016/j.actpsy.2016.10.003},
doi = {10.1016/j.actpsy.2016.10.003},
year = {2016},
date = {2016-01-01},
journal = {Acta Psychologica},
volume = {171},
pages = {85--92},
publisher = {Elsevier B.V.},
abstract = {Selective attention, i.e. the ability to concentrate one's limited processing resources on one aspect of the environment, is a multifaceted concept that includes different processes like spatial attention and its subcomponents of orienting and focusing. Several studies, indeed, have shown that visual tasks performance is positively influenced not only by attracting attention to the target location (orientation component), but also by the adjustment of the size of the attentional window according to task demands (focal component). Nevertheless, the relative weight of the two components in central and peripheral vision has never been studied. We conducted two experiments to explore whether different components of spatial attention have different effects in central and peripheral vision. In order to do so, participants underwent either a detection (Experiment 1) or a discrimination (Experiment 2) task where different types of cues elicited different components of spatial attention: a red dot, a small square and a big square (an optimal stimulus for the orientation component, an optimal and a sub-optimal stimulus for the focal component respectively). Response times and cue-size effects indicated a stronger effect of the small square or of the dot in different conditions, suggesting the existence of a dissociation in terms of mechanisms between the focal and the orientation components of spatial attention. Specifically, we found that the orientation component was stronger in periphery, while the focal component was noticeable only in central vision and characterized by an exogenous nature.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Selective attention, i.e. the ability to concentrate one's limited processing resources on one aspect of the environment, is a multifaceted concept that includes different processes like spatial attention and its subcomponents of orienting and focusing. Several studies, indeed, have shown that visual tasks performance is positively influenced not only by attracting attention to the target location (orientation component), but also by the adjustment of the size of the attentional window according to task demands (focal component). Nevertheless, the relative weight of the two components in central and peripheral vision has never been studied. We conducted two experiments to explore whether different components of spatial attention have different effects in central and peripheral vision. In order to do so, participants underwent either a detection (Experiment 1) or a discrimination (Experiment 2) task where different types of cues elicited different components of spatial attention: a red dot, a small square and a big square (an optimal stimulus for the orientation component, an optimal and a sub-optimal stimulus for the focal component respectively). Response times and cue-size effects indicated a stronger effect of the small square or of the dot in different conditions, suggesting the existence of a dissociation in terms of mechanisms between the focal and the orientation components of spatial attention. Specifically, we found that the orientation component was stronger in periphery, while the focal component was noticeable only in central vision and characterized by an exogenous nature. |
Robert G Alexander; Gregory J Zelinsky Visual similarity effects in categorical search Journal Article Journal of Vision, 11 (8), pp. 1–15, 2011. Abstract | Links | BibTeX @article{Alexander2011,
title = {Visual similarity effects in categorical search},
author = {Robert G Alexander and Gregory J Zelinsky},
url = {http://jov.arvojournals.org/Article.aspx?doi=10.1167/11.8.9},
doi = {10.1167/11.8.9},
year = {2011},
date = {2011-01-01},
journal = {Journal of Vision},
volume = {11},
number = {8},
pages = {1--15},
abstract = {We asked how visual similarity relationships affect search guidance to categorically defined targets (no visual preview). Experiment 1 used a web-based task to collect visual similarity rankings between two target categories, teddy bears and butterflies, and random-category objects, from which we created search displays in Experiment 2 having either high-similarity distractors, low-similarity distractors, or "mixed" displays with high-, medium-, and low-similarity distractors. Analysis of target-absent trials revealed faster manual responses and fewer fixated distractors on low-similarity displays compared to high-similarity displays. On mixed displays, first fixations were more frequent on high-similarity distractors (bear = 49%; butterfly = 58%) than on low-similarity distractors (bear = 9%; butterfly = 12%). Experiment 3 used the same high/low/mixed conditions, but now these conditions were created using similarity estimates from a computer vision model that ranked objects in terms of color, texture, and shape similarity. The same patterns were found, suggesting that categorical search can indeed be guided by purely visual similarity. Experiment 4 compared cases where the model and human rankings differed and when they agreed. We found that similarity effects were best predicted by cases where the two sets of rankings agreed, suggesting that both human visual similarity rankings and the computer vision model captured features important for guiding search to categorical targets.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We asked how visual similarity relationships affect search guidance to categorically defined targets (no visual preview). Experiment 1 used a web-based task to collect visual similarity rankings between two target categories, teddy bears and butterflies, and random-category objects, from which we created search displays in Experiment 2 having either high-similarity distractors, low-similarity distractors, or "mixed" displays with high-, medium-, and low-similarity distractors. Analysis of target-absent trials revealed faster manual responses and fewer fixated distractors on low-similarity displays compared to high-similarity displays. On mixed displays, first fixations were more frequent on high-similarity distractors (bear = 49%; butterfly = 58%) than on low-similarity distractors (bear = 9%; butterfly = 12%). Experiment 3 used the same high/low/mixed conditions, but now these conditions were created using similarity estimates from a computer vision model that ranked objects in terms of color, texture, and shape similarity. The same patterns were found, suggesting that categorical search can indeed be guided by purely visual similarity. Experiment 4 compared cases where the model and human rankings differed and when they agreed. We found that similarity effects were best predicted by cases where the two sets of rankings agreed, suggesting that both human visual similarity rankings and the computer vision model captured features important for guiding search to categorical targets. |
Robert G Alexander; Gregory J Zelinsky Effects of part-based similarity on visual search: The Frankenbear experiment Journal Article Vision Research, 54 , pp. 20–30, 2012. Abstract | Links | BibTeX @article{Alexander2012,
title = {Effects of part-based similarity on visual search: The Frankenbear experiment},
author = {Robert G Alexander and Gregory J Zelinsky},
doi = {10.1016/j.visres.2011.12.004},
year = {2012},
date = {2012-01-01},
journal = {Vision Research},
volume = {54},
pages = {20--30},
abstract = {Do the target-distractor and distractor-distractor similarity relationships known to exist for simple stimuli extend to real-world objects, and are these effects expressed in search guidance or target verification? Parts of photorealistic distractors were replaced with target parts to create four levels of target-distractor similarity under heterogenous and homogenous conditions. We found that increasing target-distractor similarity and decreasing distractor-distractor similarity impaired search guidance and target verification, but that target-distractor similarity and heterogeneity/homogeneity interacted only in measures of guidance; distractor homogeneity lessens effects of target-distractor similarity by causing gaze to fixate the target sooner, not by speeding target detection following its fixation.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Do the target-distractor and distractor-distractor similarity relationships known to exist for simple stimuli extend to real-world objects, and are these effects expressed in search guidance or target verification? Parts of photorealistic distractors were replaced with target parts to create four levels of target-distractor similarity under heterogenous and homogenous conditions. We found that increasing target-distractor similarity and decreasing distractor-distractor similarity impaired search guidance and target verification, but that target-distractor similarity and heterogeneity/homogeneity interacted only in measures of guidance; distractor homogeneity lessens effects of target-distractor similarity by causing gaze to fixate the target sooner, not by speeding target detection following its fixation. |
Robert G Alexander; Joseph Schmidt; Gregory J Zelinsky Are summary statistics enough? Evidence for the importance of shape in guiding visual search Journal Article Visual Cognition, 22 (3), pp. 595–609, 2014. Abstract | Links | BibTeX @article{Alexander2014,
title = {Are summary statistics enough? Evidence for the importance of shape in guiding visual search},
author = {Robert G Alexander and Joseph Schmidt and Gregory J Zelinsky},
doi = {10.1080/13506285.2014.890989},
year = {2014},
date = {2014-01-01},
journal = {Visual Cognition},
volume = {22},
number = {3},
pages = {595--609},
abstract = {Peripheral vision outside the focus of attention may rely on summary statistics. We used a gaze-contingent paradigm to directly test this assumption by asking whether search performance differed between targets and statistically-matched visualizations of the same targets. Four-object search displays included one statistically-matched object that was replaced by an unaltered version of the object during the first eye movement. Targets were designated by previews, which were never altered. Two types of statistically-matched objects were tested: One that maintained global shape and one that did not. Differences in guidance were found between targets and statistically-matched objects when shape was not preserved, suggesting that they were not informationally equivalent. Responses were also slower after target fixation when shape was not preserved, suggesting an extrafoveal processing of the target that again used shape information. We conclude that summary statistics must include some global shape information to approximate the peripheral information used during search.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Peripheral vision outside the focus of attention may rely on summary statistics. We used a gaze-contingent paradigm to directly test this assumption by asking whether search performance differed between targets and statistically-matched visualizations of the same targets. Four-object search displays included one statistically-matched object that was replaced by an unaltered version of the object during the first eye movement. Targets were designated by previews, which were never altered. Two types of statistically-matched objects were tested: One that maintained global shape and one that did not. Differences in guidance were found between targets and statistically-matched objects when shape was not preserved, suggesting that they were not informationally equivalent. Responses were also slower after target fixation when shape was not preserved, suggesting an extrafoveal processing of the target that again used shape information. We conclude that summary statistics must include some global shape information to approximate the peripheral information used during search. |
Arjen Alink; Felix Euler; Nikolaus Kriegeskorte; Wolf Singer; Axel Kohler Auditory motion direction encoding in auditory cortex and high-level visual cortex Journal Article Human Brain Mapping, 33 (4), pp. 969–978, 2012. Abstract | Links | BibTeX @article{Alink2012,
title = {Auditory motion direction encoding in auditory cortex and high-level visual cortex},
author = {Arjen Alink and Felix Euler and Nikolaus Kriegeskorte and Wolf Singer and Axel Kohler},
doi = {10.1002/hbm.21263},
year = {2012},
date = {2012-01-01},
journal = {Human Brain Mapping},
volume = {33},
number = {4},
pages = {969--978},
abstract = {The aim of this functional magnetic resonance imaging (fMRI) study was to identify human brain areas that are sensitive to the direction of auditory motion. Such directional sensitivity was assessed in a hypothesis-free manner by analyzing fMRI response patterns across the entire brain volume using a spherical-searchlight approach. In addition, we assessed directional sensitivity in three predefined brain areas that have been associated with auditory motion perception in previous neuroimaging studies. These were the primary auditory cortex, the planum temporale and the visual motion complex (hMT/ from fMRI response patterns in the right auditory cortex and in a high-level visual area located in the V5þ). Our whole-brain analysis revealed that the direction of sound-source movement could be decoded right lateral occipital cortex. Our region-of-interest-based analysis showed that the decoding of the direc- tion of auditory motion was most reliable with activation patterns of the left and right planum temporale. Auditory motion direction could not be decoded from activation patterns in hMT/V5þ. These findings provide further evidence for the planum temporale playing a central role in supporting auditory motion perception. In addition, our findings suggest a cross-modal transfer of directional information to high- level visual cortex in healthy humans.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The aim of this functional magnetic resonance imaging (fMRI) study was to identify human brain areas that are sensitive to the direction of auditory motion. Such directional sensitivity was assessed in a hypothesis-free manner by analyzing fMRI response patterns across the entire brain volume using a spherical-searchlight approach. In addition, we assessed directional sensitivity in three predefined brain areas that have been associated with auditory motion perception in previous neuroimaging studies. These were the primary auditory cortex, the planum temporale and the visual motion complex (hMT/ from fMRI response patterns in the right auditory cortex and in a high-level visual area located in the V5þ). Our whole-brain analysis revealed that the direction of sound-source movement could be decoded right lateral occipital cortex. Our region-of-interest-based analysis showed that the decoding of the direc- tion of auditory motion was most reliable with activation patterns of the left and right planum temporale. Auditory motion direction could not be decoded from activation patterns in hMT/V5þ. These findings provide further evidence for the planum temporale playing a central role in supporting auditory motion perception. In addition, our findings suggest a cross-modal transfer of directional information to high- level visual cortex in healthy humans. |
Micah Allen; Darya Frank; D Samuel Schwarzkopf; Francesca Fardo; Joel S Winston; Tobias U Hauser; Geraint Rees Unexpected arousal modulates the influence of sensory noise on confidence Journal Article eLife, 5 , pp. 1–17, 2016. Abstract | Links | BibTeX @article{Allen2016,
title = {Unexpected arousal modulates the influence of sensory noise on confidence},
author = {Micah Allen and Darya Frank and D {Samuel Schwarzkopf} and Francesca Fardo and Joel S Winston and Tobias U Hauser and Geraint Rees},
doi = {10.7554/eLife.18103},
year = {2016},
date = {2016-01-01},
journal = {eLife},
volume = {5},
pages = {1--17},
abstract = {Human perception is invariably accompanied by a graded feeling of confidence that guides metacognitive awareness and decision-making. It is often assumed that this arises solely from the feed-forward encoding of the strength or precision of sensory inputs. In contrast, interoceptive inference models suggest that confidence reflects a weighted integration of sensory precision and expectations about internal states, such as arousal. Here we test this hypothesis using a novel psychophysical paradigm, in which unseen disgust-cues induced unexpected, unconscious arousal just before participants discriminated motion signals of variable precision. Across measures of perceptual bias, uncertainty, and physiological arousal we found that arousing disgust cues modulated the encoding of sensory noise. Furthermore, the degree to which trial-by-trial pupil fluctuations encoded this nonlinear interaction correlated with trial level confidence. Our results suggest that unexpected arousal regulates perceptual precision, such that subjective confidence reflects the integration of both external sensory and internal, embodied states.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Human perception is invariably accompanied by a graded feeling of confidence that guides metacognitive awareness and decision-making. It is often assumed that this arises solely from the feed-forward encoding of the strength or precision of sensory inputs. In contrast, interoceptive inference models suggest that confidence reflects a weighted integration of sensory precision and expectations about internal states, such as arousal. Here we test this hypothesis using a novel psychophysical paradigm, in which unseen disgust-cues induced unexpected, unconscious arousal just before participants discriminated motion signals of variable precision. Across measures of perceptual bias, uncertainty, and physiological arousal we found that arousing disgust cues modulated the encoding of sensory noise. Furthermore, the degree to which trial-by-trial pupil fluctuations encoded this nonlinear interaction correlated with trial level confidence. Our results suggest that unexpected arousal regulates perceptual precision, such that subjective confidence reflects the integration of both external sensory and internal, embodied states. |
Ava-Ann Allman; Chawki Benkelfat; France Durand; Igor Sibon; Alain Dagher; Marco Leyton; Glen B Baker; Gillian A O'Driscoll Effect of D-amphetamine on inhibition and motor planning as a function of baseline performance. Journal Article Psychopharmacology, 211 (4), pp. 423–33, 2010. Abstract | Links | BibTeX @article{Allman2010,
title = {Effect of D-amphetamine on inhibition and motor planning as a function of baseline performance.},
author = {Ava-Ann Allman and Chawki Benkelfat and France Durand and Igor Sibon and Alain Dagher and Marco Leyton and Glen B Baker and Gillian A O'Driscoll},
url = {http://www.ncbi.nlm.nih.gov/pubmed/20602089},
doi = {10.1007/s00213-010-1912-x},
year = {2010},
date = {2010-01-01},
journal = {Psychopharmacology},
volume = {211},
number = {4},
pages = {423--33},
abstract = {RATIONALE: Baseline performance has been reported to predict dopamine (DA) effects on working memory, following an inverted-U pattern. This pattern may hold true for other executive functions that are DA-sensitive. OBJECTIVES: The objective of this study is to investigate the effect of D: -amphetamine, an indirect DA agonist, on two other putatively DA-sensitive executive functions, inhibition and motor planning, as a function of baseline performance. METHODS: Participants with no prior stimulant exposure participated in a double-blind crossover study of a single dose of 0.3 mg/kg, p.o. of D: -amphetamine and placebo. Participants were divided into high and low groups, based on their performance on the antisaccade and predictive saccade tasks on the baseline day. Executive functions, mood states, heart rate and blood pressure were assessed before (T0) and after drug administration, at 1.5 (T1), 2.5 (T2) and 3.5 h (T3) post-drug. RESULTS: Antisaccade errors decreased with D: -amphetamine irrespective of baseline performance (p = 0.025). For antisaccade latency, participants who generated short-latency antisaccades at baseline had longer latencies on D: -amphetamine than placebo, while those with long-latency antisaccades at baseline had shorter latencies on D: -amphetamine than placebo (drug x group},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
RATIONALE: Baseline performance has been reported to predict dopamine (DA) effects on working memory, following an inverted-U pattern. This pattern may hold true for other executive functions that are DA-sensitive. OBJECTIVES: The objective of this study is to investigate the effect of D: -amphetamine, an indirect DA agonist, on two other putatively DA-sensitive executive functions, inhibition and motor planning, as a function of baseline performance. METHODS: Participants with no prior stimulant exposure participated in a double-blind crossover study of a single dose of 0.3 mg/kg, p.o. of D: -amphetamine and placebo. Participants were divided into high and low groups, based on their performance on the antisaccade and predictive saccade tasks on the baseline day. Executive functions, mood states, heart rate and blood pressure were assessed before (T0) and after drug administration, at 1.5 (T1), 2.5 (T2) and 3.5 h (T3) post-drug. RESULTS: Antisaccade errors decreased with D: -amphetamine irrespective of baseline performance (p = 0.025). For antisaccade latency, participants who generated short-latency antisaccades at baseline had longer latencies on D: -amphetamine than placebo, while those with long-latency antisaccades at baseline had shorter latencies on D: -amphetamine than placebo (drug x group |
Ava-Ann Allman; Ulrich Ettinger; Ridha Joober; Gillian A O'Driscoll Effects of methylphenidate on basic and higher-order oculomotor functions Journal Article Journal of Psychopharmacology, 26 (11), pp. 1471–1479, 2012. Abstract | Links | BibTeX @article{Allman2012,
title = {Effects of methylphenidate on basic and higher-order oculomotor functions},
author = {Ava-Ann Allman and Ulrich Ettinger and Ridha Joober and Gillian A O'Driscoll},
doi = {10.1177/0269881112446531},
year = {2012},
date = {2012-01-01},
journal = {Journal of Psychopharmacology},
volume = {26},
number = {11},
pages = {1471--1479},
abstract = {Eye movements are sensitive indicators of pharmacological effects on sensorimotor and cognitive processing. Methylphenidate (MPH) is one of the most prescribed medications in psychiatry. It is increasingly used as a cognitive enhancer by healthy individuals. However, little is known of its effect on healthy cognition. Here we used oculomotor tests to evaluate the effects of MPH on basic oculomotor and executive functions. Twenty-nine males were given 20mg of MPH orally in a double-blind placebo-controlled crossover design. Participants performed visually-guided saccades, sinusoidal smooth pursuit, predictive saccades and antisaccades one hour post-capsule administration. Heart rate and blood pressure were assessed prior to capsule administration, and again before and after task performance. Visually-guided saccade latency decreased with MPH (ptextless0.004). Smooth pursuit gain increased on MPH (ptextless0.001) and number of saccades during pursuit decreased (ptextless0.001). Proportion of predictive saccades increased on MPH (ptextless0.004), specifically in conditions with predictable timing. Peak velocity of predictive saccades increased with MPH (ptextless0.01). Antisaccade errors and latency were unaffected. Physiological variables were also unaffected. The effects on visually-guided saccade latency and peak velocity are consistent with MPH effects on dopamine in basal ganglia. The improvements in predictive saccade conditions and smooth pursuit suggest effects on timing functions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Eye movements are sensitive indicators of pharmacological effects on sensorimotor and cognitive processing. Methylphenidate (MPH) is one of the most prescribed medications in psychiatry. It is increasingly used as a cognitive enhancer by healthy individuals. However, little is known of its effect on healthy cognition. Here we used oculomotor tests to evaluate the effects of MPH on basic oculomotor and executive functions. Twenty-nine males were given 20mg of MPH orally in a double-blind placebo-controlled crossover design. Participants performed visually-guided saccades, sinusoidal smooth pursuit, predictive saccades and antisaccades one hour post-capsule administration. Heart rate and blood pressure were assessed prior to capsule administration, and again before and after task performance. Visually-guided saccade latency decreased with MPH (ptextless0.004). Smooth pursuit gain increased on MPH (ptextless0.001) and number of saccades during pursuit decreased (ptextless0.001). Proportion of predictive saccades increased on MPH (ptextless0.004), specifically in conditions with predictable timing. Peak velocity of predictive saccades increased with MPH (ptextless0.01). Antisaccade errors and latency were unaffected. Physiological variables were also unaffected. The effects on visually-guided saccade latency and peak velocity are consistent with MPH effects on dopamine in basal ganglia. The improvements in predictive saccade conditions and smooth pursuit suggest effects on timing functions. |
Albandri Alotaibi; Geoffrey Underwood; Alastair D Smith Cultural differences in attention: Eye movement evidence from a comparative visual search task Journal Article Consciousness and Cognition, 55 , pp. 254–265, 2017. Abstract | Links | BibTeX @article{Alotaibi2017,
title = {Cultural differences in attention: Eye movement evidence from a comparative visual search task},
author = {Albandri Alotaibi and Geoffrey Underwood and Alastair D Smith},
doi = {10.1016/j.concog.2017.09.002},
year = {2017},
date = {2017-01-01},
journal = {Consciousness and Cognition},
volume = {55},
pages = {254--265},
abstract = {Individual differences in visual attention have been linked to thinking style: analytic thinking (common in individualistic cultures) is thought to promote attention to detail and focus on the most important part of a scene, whereas holistic thinking (common in collectivist cultures) promotes attention to the global structure of a scene and the relationship between its parts. However, this theory is primarily based on relatively simple judgement tasks. We compared groups from Great Britain (an individualist culture) and Saudi Arabia (a collectivist culture) on a more complex comparative visual search task, using simple natural scenes. A higher overall number of fixations for Saudi participants, along with longer search times, indicated less efficient search behaviour than British participants. Furthermore, intra-group comparisons of scan-path for Saudi participants revealed less similarity than within the British group. Together, these findings suggest that there is a positive relationship between an analytic cognitive style and controlled attention.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Individual differences in visual attention have been linked to thinking style: analytic thinking (common in individualistic cultures) is thought to promote attention to detail and focus on the most important part of a scene, whereas holistic thinking (common in collectivist cultures) promotes attention to the global structure of a scene and the relationship between its parts. However, this theory is primarily based on relatively simple judgement tasks. We compared groups from Great Britain (an individualist culture) and Saudi Arabia (a collectivist culture) on a more complex comparative visual search task, using simple natural scenes. A higher overall number of fixations for Saudi participants, along with longer search times, indicated less efficient search behaviour than British participants. Furthermore, intra-group comparisons of scan-path for Saudi participants revealed less similarity than within the British group. Together, these findings suggest that there is a positive relationship between an analytic cognitive style and controlled attention. |
Reem Alsadoon; Trude Heift Textual input enhancement for vowel blindness: A study with Arabic ESL learners Journal Article The Modern Language Journal, 99 (1), pp. 57–79, 2015. Abstract | Links | BibTeX @article{Alsadoon2015,
title = {Textual input enhancement for vowel blindness: A study with Arabic ESL learners},
author = {Reem Alsadoon and Trude Heift},
doi = {10.1111/modl.12188},
year = {2015},
date = {2015-01-01},
journal = {The Modern Language Journal},
volume = {99},
number = {1},
pages = {57--79},
abstract = {This study explores the impact of textual input enhancement on the noticing and intake of English vowels by Arabic L2 learners of English. Arabic L1 speakers are known to experience vowel blindness, commonly defined as a difficulty in the textual decoding and encoding of English vowels due to an insufficient decoding of the word form. Thirty beginner ESL learners participated in a training study during which the experimental group received textual input enhancement on English vowels. Students completed a pretest and an immediate and delayed posttest. An eye-tracker recorded students' eye fixations during the treatment phase. Results indicate that vowel blindness was significantly reduced for the experimental group who received vowel training in the form of textual input enhancement. This might be due to a longer focus on the target words as suggested by our eye-tracking data.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This study explores the impact of textual input enhancement on the noticing and intake of English vowels by Arabic L2 learners of English. Arabic L1 speakers are known to experience vowel blindness, commonly defined as a difficulty in the textual decoding and encoding of English vowels due to an insufficient decoding of the word form. Thirty beginner ESL learners participated in a training study during which the experimental group received textual input enhancement on English vowels. Students completed a pretest and an immediate and delayed posttest. An eye-tracker recorded students' eye fixations during the treatment phase. Results indicate that vowel blindness was significantly reduced for the experimental group who received vowel training in the form of textual input enhancement. This might be due to a longer focus on the target words as suggested by our eye-tracking data. |
Christian F Altmann; Arne Deubelius; Zoe Kourtzi Shape saliency modulates contextual processing in the human lateral occipital complex Journal Article Journal of Cognitive Neuroscience, 16 (5), pp. 794–804, 2004. Abstract | Links | BibTeX @article{Altmann2004,
title = {Shape saliency modulates contextual processing in the human lateral occipital complex},
author = {Christian F Altmann and Arne Deubelius and Zoe Kourtzi},
doi = {10.1162/089892904970825},
year = {2004},
date = {2004-01-01},
journal = {Journal of Cognitive Neuroscience},
volume = {16},
number = {5},
pages = {794--804},
abstract = {Visual context influences our perception of target objects in natural scenes. However, little is known about the analysis of context information and its role in shape perception in the human brain. We investigated whether the human lateral occipital complex (LOC), known to be involved in the visual analysis of shapes, also processes information about the context of shapes within cluttered scenes. We employed an fMRI adaptation paradigm in which fMRI responses are lower for two identical than for two different stimuli presented consecutively. The stimuli consisted of closed target contours defined by aligned Gabor elements embedded in a background of randomly oriented Gabors. We measured fMRI adaptation in the LOC across changes in the context of the target shapes by manipulating the position and orientation of the background elements. No adaptation was observed across context changes when the background elements were presented in the same plane as the target elements. However, adaptation was observed when the grouping of the target elements was enhanced in a bottom-up (i.e., grouping by disparity or motion) or top-down (i.e., shape priming) manner and thus the saliency of the target shape increased. These findings suggest that the LOC processes information not only about shapes, but also about their context. This processing of context information in the LOC is modulated by figure-ground segmentation and grouping processes. That is, neural populations in the LOC encode context information when relevant to the perception of target shapes, but represent salient targets independent of context changes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Visual context influences our perception of target objects in natural scenes. However, little is known about the analysis of context information and its role in shape perception in the human brain. We investigated whether the human lateral occipital complex (LOC), known to be involved in the visual analysis of shapes, also processes information about the context of shapes within cluttered scenes. We employed an fMRI adaptation paradigm in which fMRI responses are lower for two identical than for two different stimuli presented consecutively. The stimuli consisted of closed target contours defined by aligned Gabor elements embedded in a background of randomly oriented Gabors. We measured fMRI adaptation in the LOC across changes in the context of the target shapes by manipulating the position and orientation of the background elements. No adaptation was observed across context changes when the background elements were presented in the same plane as the target elements. However, adaptation was observed when the grouping of the target elements was enhanced in a bottom-up (i.e., grouping by disparity or motion) or top-down (i.e., shape priming) manner and thus the saliency of the target shape increased. These findings suggest that the LOC processes information not only about shapes, but also about their context. This processing of context information in the LOC is modulated by figure-ground segmentation and grouping processes. That is, neural populations in the LOC encode context information when relevant to the perception of target shapes, but represent salient targets independent of context changes. |
Kaoru Amano; Tsunehiro Takeda; Tomoki Haji; Masahiko Terao; Kazushi Maruya; Kenji Matsumoto; Ikuya Murakami; Shin'ya Nishida Human neural responses involved in spatial pooling of locally ambiguous motion signals Journal Article Journal of Neurophysiology, 107 (12), pp. 3493–3508, 2012. Abstract | Links | BibTeX @article{Amano2012,
title = {Human neural responses involved in spatial pooling of locally ambiguous motion signals},
author = {Kaoru Amano and Tsunehiro Takeda and Tomoki Haji and Masahiko Terao and Kazushi Maruya and Kenji Matsumoto and Ikuya Murakami and Shin'ya Nishida},
url = {http://www.physiology.org/doi/10.1152/jn.00821.2011},
doi = {10.1152/jn.00821.2011},
year = {2012},
date = {2012-01-01},
journal = {Journal of Neurophysiology},
volume = {107},
number = {12},
pages = {3493--3508},
abstract = {Early visual motion signals are local and one-dimensional (1-D). For specification of global two-dimensional (2-D) motion vectors, the visual system should appropriately integrate these signals across orientation and space. Previous neurophysiological studies have suggested that this integration process consists of two computational steps (estimation of local 2-D motion vectors, followed by their spatial pooling), both being identified in the area MT. Psychophysical findings, however, suggest that under certain stimulus conditions, the human visual system can also compute mathematically correct global motion vectors from direct pooling of spatially distributed 1-D motion signals. To study the neural mechanisms responsible for this novel 1-D motion pooling, we conducted human magnetoencephalography (MEG) and functional MRI experiments using a global motion stimulus comprising multiple moving Gabors (global-Gabor motion). In the first experiment, we measured MEG and blood oxygen level-dependent responses while changing motion coherence of global-Gabor motion. In the second experiment, we investigated cortical responses correlated with direction-selective adaptation to the global 2-D motion, not to local 1-D motions. We found that human MT complex (hMT+) responses show both coherence dependency and direction selectivity to global motion based on 1-D pooling. The results provide the first evidence that hMT+ is the locus of 1-D motion pooling, as well as that of conventional 2-D motion pooling.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Early visual motion signals are local and one-dimensional (1-D). For specification of global two-dimensional (2-D) motion vectors, the visual system should appropriately integrate these signals across orientation and space. Previous neurophysiological studies have suggested that this integration process consists of two computational steps (estimation of local 2-D motion vectors, followed by their spatial pooling), both being identified in the area MT. Psychophysical findings, however, suggest that under certain stimulus conditions, the human visual system can also compute mathematically correct global motion vectors from direct pooling of spatially distributed 1-D motion signals. To study the neural mechanisms responsible for this novel 1-D motion pooling, we conducted human magnetoencephalography (MEG) and functional MRI experiments using a global motion stimulus comprising multiple moving Gabors (global-Gabor motion). In the first experiment, we measured MEG and blood oxygen level-dependent responses while changing motion coherence of global-Gabor motion. In the second experiment, we investigated cortical responses correlated with direction-selective adaptation to the global 2-D motion, not to local 1-D motions. We found that human MT complex (hMT+) responses show both coherence dependency and direction selectivity to global motion based on 1-D pooling. The results provide the first evidence that hMT+ is the locus of 1-D motion pooling, as well as that of conventional 2-D motion pooling. |
Ilhame Ameqrane; Pierre Pouget; Nicolas Wattiez; Roger Carpenter; Marcus Missal Implicit and explicit timing in oculomotor control Journal Article PLoS ONE, 9 (4), pp. 1–11, 2014. Abstract | Links | BibTeX @article{Ameqrane2014,
title = {Implicit and explicit timing in oculomotor control},
author = {Ilhame Ameqrane and Pierre Pouget and Nicolas Wattiez and Roger Carpenter and Marcus Missal},
doi = {10.1371/journal.pone.0093958},
year = {2014},
date = {2014-01-01},
journal = {PLoS ONE},
volume = {9},
number = {4},
pages = {1--11},
abstract = {The passage of time can be estimated either explicitly, e.g. before leaving home in the morning, or implicitly, e.g. when catching a flying ball. In the present study, the latency of saccadic eye movements was used to evaluate differences between implicit and explicit timing. Humans were required to make a saccade between a central and a peripheral position on a computer screen. The delay between the extinction of a central target and the appearance of an eccentric target was the independent variable that could take one out of four different values (400, 900, 1400 or 1900 ms). In target trials, the delay period lasted for one of the four durations randomly. At the end of the delay, a saccade was initiated by the appearance of an eccentric target. Cue&target trials were similar to target trials but the duration of the delay was visually cued. In probe trials, the duration of the upcoming delay was cued, but there was no eccentric target and subjects had to internally generate a saccade at the estimated end of the delay. In target and cue&target trials, the mean and variance of latency distributions decreased as delay duration increased. In cue&target trials latencies were shorter. In probe trials, the variance increased with increasing delay duration and scalar variability was observed. The major differences in saccadic latency distributions were observed between visually-guided (target and cue&target trials) and internally-generated saccades (probe trials). In target and cue&target trials the timing of the response was implicit. In probe trials, the timing of the response was internally-generated and explicitly based on the duration of the visual cue. Scalar timing was observed only during probe trials. This study supports the hypothesis that there is no ubiquitous timing system in the brain but independent timing processes active depending on task demands.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The passage of time can be estimated either explicitly, e.g. before leaving home in the morning, or implicitly, e.g. when catching a flying ball. In the present study, the latency of saccadic eye movements was used to evaluate differences between implicit and explicit timing. Humans were required to make a saccade between a central and a peripheral position on a computer screen. The delay between the extinction of a central target and the appearance of an eccentric target was the independent variable that could take one out of four different values (400, 900, 1400 or 1900 ms). In target trials, the delay period lasted for one of the four durations randomly. At the end of the delay, a saccade was initiated by the appearance of an eccentric target. Cue&target trials were similar to target trials but the duration of the delay was visually cued. In probe trials, the duration of the upcoming delay was cued, but there was no eccentric target and subjects had to internally generate a saccade at the estimated end of the delay. In target and cue&target trials, the mean and variance of latency distributions decreased as delay duration increased. In cue&target trials latencies were shorter. In probe trials, the variance increased with increasing delay duration and scalar variability was observed. The major differences in saccadic latency distributions were observed between visually-guided (target and cue&target trials) and internally-generated saccades (probe trials). In target and cue&target trials the timing of the response was implicit. In probe trials, the timing of the response was internally-generated and explicitly based on the duration of the visual cue. Scalar timing was observed only during probe trials. This study supports the hypothesis that there is no ubiquitous timing system in the brain but independent timing processes active depending on task demands. |
Richard Amlôt; Robin Walker Are somatosensory saccades voluntary or reflexive? Journal Article Experimental Brain Research, 168 (4), pp. 557–565, 2006. Abstract | Links | BibTeX @article{Amlot2006,
title = {Are somatosensory saccades voluntary or reflexive?},
author = {Richard Aml{ô}t and Robin Walker},
doi = {10.1007/s00221-005-0116-9},
year = {2006},
date = {2006-01-01},
journal = {Experimental Brain Research},
volume = {168},
number = {4},
pages = {557--565},
abstract = {The present study examines whether the distinction between voluntary (endogenous) and reflexive (stimulus-elicited) saccades made in the visual modality can be applied to the somatosensory modality. The behavioural characteristics of putative reflexive pro-saccades and voluntary anti-saccades made to visual and somatosensory stimuli were examined. Both visual and somatosensory pro-saccades had much shorter latency than voluntary anti-saccades made in the direction opposite to a peripheral stimulus. Furthermore, erroneous pro-saccades were made towards both visual and somatosensory stimuli on approximately 11-13% of anti-saccade trials. The observed difference in pro- and anti-saccade latency and the presence of pro-saccade errors in the anti-saccade task indicates that a somatosensory stimulus can elicit a form of reflexive saccade comparable to pro-saccades made in the visual modality. It is proposed that a peripheral somatosensory stimulus can elicit a form of reflexive saccade and that somatosensory saccades do not depend exclusively on higher level endogenous control processes for their generation. However, a comparison of the underlying latency distributions and of peak-velocity profiles of saccades made to visual and somatosensory stimuli showed that this distinction may be less clearly defined for the somatosensory modality and that modality-specific differences (such as differences in neural conduction rates) in the underlying oculomotor structures involved in saccade target selection also need to be considered. It is further suggested that a broader conceptualisation of saccades and saccade programming beyond the simple voluntary and reflexive dichotomy, that takes into account the control processes involved in saccade generation for both modalities, may be required.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The present study examines whether the distinction between voluntary (endogenous) and reflexive (stimulus-elicited) saccades made in the visual modality can be applied to the somatosensory modality. The behavioural characteristics of putative reflexive pro-saccades and voluntary anti-saccades made to visual and somatosensory stimuli were examined. Both visual and somatosensory pro-saccades had much shorter latency than voluntary anti-saccades made in the direction opposite to a peripheral stimulus. Furthermore, erroneous pro-saccades were made towards both visual and somatosensory stimuli on approximately 11-13% of anti-saccade trials. The observed difference in pro- and anti-saccade latency and the presence of pro-saccade errors in the anti-saccade task indicates that a somatosensory stimulus can elicit a form of reflexive saccade comparable to pro-saccades made in the visual modality. It is proposed that a peripheral somatosensory stimulus can elicit a form of reflexive saccade and that somatosensory saccades do not depend exclusively on higher level endogenous control processes for their generation. However, a comparison of the underlying latency distributions and of peak-velocity profiles of saccades made to visual and somatosensory stimuli showed that this distinction may be less clearly defined for the somatosensory modality and that modality-specific differences (such as differences in neural conduction rates) in the underlying oculomotor structures involved in saccade target selection also need to be considered. It is further suggested that a broader conceptualisation of saccades and saccade programming beyond the simple voluntary and reflexive dichotomy, that takes into account the control processes involved in saccade generation for both modalities, may be required. |
Tatiana A Amor; Saulo D S Reis; Daniel Campos; Hans J Herrmann; José S Andrade Persistence in eye movement during visual search Journal Article Scientific Reports, 6 , pp. 1–12, 2016. Abstract | Links | BibTeX @article{Amor2016,
title = {Persistence in eye movement during visual search},
author = {Tatiana A Amor and Saulo D S Reis and Daniel Campos and Hans J Herrmann and José S Andrade},
url = {http://www.nature.com/articles/srep20815},
doi = {10.1038/srep20815},
year = {2016},
date = {2016-01-01},
journal = {Scientific Reports},
volume = {6},
pages = {1--12},
publisher = {Nature Publishing Group},
abstract = {As any cognitive task, visual search involves a number of underlying processes that cannot be directly observed and measured. In this way, the movement of the eyes certainly represents the most explicit and closest connection we can get to the inner mechanisms governing this cognitive activity. Here we show that the process of eye movement during visual search, consisting of sequences of fixations intercalated by saccades, exhibits distinctive persistent behaviors. Initially, by focusing on saccadic directions and intersaccadic angles, we disclose that the probability distributions of these measures show a clear preference of participants towards a reading-like mechanism (geometrical persistence), whose features and potential advantages for searching/foraging are discussed. We then perform a Multifractal Detrended Fluctuation Analysis (MF-DFA) over the time series of jump magnitudes in the eye trajectory and find that it exhibits a typical multifractal behavior arising from the sequential combination of saccades and fixations. By inspecting the time series composed of only fixational movements, our results reveal instead a monofractal behavior with a Hurst exponent , which indicates the presence of long-range power-law positive correlations (statistical persistence). We expect that our methodological approach can be adopted as a way to understand persistence and strategy-planning during visual search.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
As any cognitive task, visual search involves a number of underlying processes that cannot be directly observed and measured. In this way, the movement of the eyes certainly represents the most explicit and closest connection we can get to the inner mechanisms governing this cognitive activity. Here we show that the process of eye movement during visual search, consisting of sequences of fixations intercalated by saccades, exhibits distinctive persistent behaviors. Initially, by focusing on saccadic directions and intersaccadic angles, we disclose that the probability distributions of these measures show a clear preference of participants towards a reading-like mechanism (geometrical persistence), whose features and potential advantages for searching/foraging are discussed. We then perform a Multifractal Detrended Fluctuation Analysis (MF-DFA) over the time series of jump magnitudes in the eye trajectory and find that it exhibits a typical multifractal behavior arising from the sequential combination of saccades and fixations. By inspecting the time series composed of only fixational movements, our results reveal instead a monofractal behavior with a Hurst exponent , which indicates the presence of long-range power-law positive correlations (statistical persistence). We expect that our methodological approach can be adopted as a way to understand persistence and strategy-planning during visual search. |
Tatiana A Amor; Mirko Luković; Hans J Herrmann; José S Andrade Influence of scene structure and content on visual search strategies Journal Article Journal of the Royal Society Interface, 14 (132), 2017. Abstract | Links | BibTeX @article{Amor2017,
title = {Influence of scene structure and content on visual search strategies},
author = {Tatiana A Amor and Mirko Lukovi{ć} and Hans J Herrmann and José S Andrade},
doi = {10.1098/rsif.2017.0406},
year = {2017},
date = {2017-01-01},
journal = {Journal of the Royal Society Interface},
volume = {14},
number = {132},
abstract = {When searching for a target within an image, our brain can adopt different strategies, but which one does it choose? This question can be answered by tracking the motion of the eye while it executes the task. Following many individuals performing various search tasks, we distinguish between two competing strategies. Motivated by these findings, we introduce a model that captures the interplay of the search strategies and allows us to create artificial eye-tracking trajectories, which could be compared with the experimental ones. Identifying the model parameters allows us to quantify the strategy employed in terms of ensemble averages, characterizing each experimental cohort. In this way, we can discern with high sensitivity the relation between the visual landscape and the average strategy, disclosing how small variations in the image induce changes in the strategy.},
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When searching for a target within an image, our brain can adopt different strategies, but which one does it choose? This question can be answered by tracking the motion of the eye while it executes the task. Following many individuals performing various search tasks, we distinguish between two competing strategies. Motivated by these findings, we introduce a model that captures the interplay of the search strategies and allows us to create artificial eye-tracking trajectories, which could be compared with the experimental ones. Identifying the model parameters allows us to quantify the strategy employed in terms of ensemble averages, characterizing each experimental cohort. In this way, we can discern with high sensitivity the relation between the visual landscape and the average strategy, disclosing how small variations in the image induce changes in the strategy. |
Lucía Amoruso; Agustín Ibáñez; Bruno Fonseca; Sebastián Gadea; Lucas Sedeño; Mariano Sigman; Adolfo M García; Ricardo Fraiman; Daniel Fraiman Variability in functional brain networks predicts expertise during action observation Journal Article NeuroImage, 146 , pp. 690–700, 2017. Abstract | Links | BibTeX @article{Amoruso2017,
title = {Variability in functional brain networks predicts expertise during action observation},
author = {Lucía Amoruso and Agustín Ibá{ñ}ez and Bruno Fonseca and Sebastián Gadea and Lucas Sede{ñ}o and Mariano Sigman and Adolfo M García and Ricardo Fraiman and Daniel Fraiman},
url = {http://dx.doi.org/10.1016/j.neuroimage.2016.09.041},
doi = {10.1016/j.neuroimage.2016.09.041},
year = {2017},
date = {2017-01-01},
journal = {NeuroImage},
volume = {146},
pages = {690--700},
publisher = {Elsevier},
abstract = {Observing an action performed by another individual activates, in the observer, similar circuits as those involved in the actual execution of that action. This activation is modulated by prior experience; indeed, sustained training in a particular motor domain leads to structural and functional changes in critical brain areas. Here, we capitalized on a novel graph-theory approach to electroencephalographic data (Fraiman et al., 2016) to test whether variability in functional brain networks implicated in Tango observation can discriminate between groups differing in their level of expertise. We found that experts and beginners significantly differed in the functional organization of task-relevant networks. Specifically, networks in expert Tango dancers exhibited less variability and a more robust functional architecture. Notably, these expertise-dependent effects were captured within networks derived from electrophysiological brain activity recorded in a very short time window (2 s). In brief, variability in the organization of task-related networks seems to be a highly sensitive indicator of long-lasting training effects. This finding opens new methodological and theoretical windows to explore the impact of domain-specific expertise on brain plasticity, while highlighting variability as a fruitful measure in neuroimaging research.},
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Observing an action performed by another individual activates, in the observer, similar circuits as those involved in the actual execution of that action. This activation is modulated by prior experience; indeed, sustained training in a particular motor domain leads to structural and functional changes in critical brain areas. Here, we capitalized on a novel graph-theory approach to electroencephalographic data (Fraiman et al., 2016) to test whether variability in functional brain networks implicated in Tango observation can discriminate between groups differing in their level of expertise. We found that experts and beginners significantly differed in the functional organization of task-relevant networks. Specifically, networks in expert Tango dancers exhibited less variability and a more robust functional architecture. Notably, these expertise-dependent effects were captured within networks derived from electrophysiological brain activity recorded in a very short time window (2 s). In brief, variability in the organization of task-related networks seems to be a highly sensitive indicator of long-lasting training effects. This finding opens new methodological and theoretical windows to explore the impact of domain-specific expertise on brain plasticity, while highlighting variability as a fruitful measure in neuroimaging research. |
E J Anderson; S K Mannan; M Husain; G Rees; P Sumner; D J Mort; D McRobbie; C Kennard Involvement of prefrontal cortex in visual search Journal Article Experimental Brain Research, 180 (2), pp. 289–302, 2007. Abstract | Links | BibTeX @article{Anderson2007,
title = {Involvement of prefrontal cortex in visual search},
author = {E J Anderson and S K Mannan and M Husain and G Rees and P Sumner and D J Mort and D McRobbie and C Kennard},
doi = {10.1007/s00221-007-0860-0},
year = {2007},
date = {2007-01-01},
journal = {Experimental Brain Research},
volume = {180},
number = {2},
pages = {289--302},
abstract = {Visual search for target items embedded within a set of distracting items has consistently been shown to engage regions of occipital and parietal cortex, but the contribution of different regions of prefrontal cortex remains unclear. Here, we used fMRI to compare brain activity in 12 healthy participants performing efficient and inefficient search tasks in which target discriminability and the number of distractor items were manipulated. Matched baseline conditions were incorporated to control for visual and motor components of the tasks, allowing cortical activity associated with each type of search to be isolated. Region of interest analysis was applied to critical regions of prefrontal cortex to determine whether their involvement was common to both efficient and inefficient search, or unique to inefficient search alone. We found regions of the inferior and middle frontal cortex were only active during inefficient search, whereas an area in the superior frontal cortex (in the region of FEF) was active for both efficient and inefficient search. Thus, regions of ventral as well as dorsal prefrontal cortex are recruited during inefficient search, and we propose that this activity is related to processes that guide, control and monitor the allocation of selective attention.},
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Visual search for target items embedded within a set of distracting items has consistently been shown to engage regions of occipital and parietal cortex, but the contribution of different regions of prefrontal cortex remains unclear. Here, we used fMRI to compare brain activity in 12 healthy participants performing efficient and inefficient search tasks in which target discriminability and the number of distractor items were manipulated. Matched baseline conditions were incorporated to control for visual and motor components of the tasks, allowing cortical activity associated with each type of search to be isolated. Region of interest analysis was applied to critical regions of prefrontal cortex to determine whether their involvement was common to both efficient and inefficient search, or unique to inefficient search alone. We found regions of the inferior and middle frontal cortex were only active during inefficient search, whereas an area in the superior frontal cortex (in the region of FEF) was active for both efficient and inefficient search. Thus, regions of ventral as well as dorsal prefrontal cortex are recruited during inefficient search, and we propose that this activity is related to processes that guide, control and monitor the allocation of selective attention. |
Elaine J Anderson; Sabira K Mannan; Geraint Rees; Petroc Sumner; Christopher Kennard A role for spatial and nonspatial working memory processes in visual search Journal Article Experimental Psychology, 55 (5), pp. 301–312, 2008. Abstract | Links | BibTeX @article{Anderson2008b,
title = {A role for spatial and nonspatial working memory processes in visual search},
author = {Elaine J Anderson and Sabira K Mannan and Geraint Rees and Petroc Sumner and Christopher Kennard},
doi = {10.1027/1618-3169.55.5.301},
year = {2008},
date = {2008-01-01},
journal = {Experimental Psychology},
volume = {55},
number = {5},
pages = {301--312},
abstract = {Searching a cluttered visual scene for a specific item of interest can take several seconds to perform if the target item is difficult to discriminate from surrounding items. Whether working memory processes are utilized to guide the path of attentional selection during such searches remains under debate. Previous studies have found evidence to support a role for spatial working memory in inefficient search, but the role of nonspatial working memory remains unclear. Here, we directly compared the role of spatial and nonspatial working memory for both an efficient and inefficient search task. In Experiment 1, we used a dual-task paradigm to investigate the effect of performing visual search within the retention interval of a spatial working memory task. Importantly, by incorporating two working memory loads (low and high) we were able to make comparisons between dual-task conditions, rather than between dual-task and single-task conditions. This design allows any interference effects observed to be attributed to changes in memory load, rather than to nonspecific effects related to "dual-task" performance. We found that the efficiency of the inefficient search task declined as spatial memory load increased, but that the efficient search task remained efficient. These results suggest that spatial memory plays an important role in inefficient but not efficient search. In Experiment 2, participants performed the same visual search tasks within the retention interval of visually matched spatial and verbal working memory tasks. Critically, we found comparable dual-task interference between inefficient search and both the spatial and nonspatial working memory tasks, indicating that inefficient search recruits working memory processes common to both domains.},
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Searching a cluttered visual scene for a specific item of interest can take several seconds to perform if the target item is difficult to discriminate from surrounding items. Whether working memory processes are utilized to guide the path of attentional selection during such searches remains under debate. Previous studies have found evidence to support a role for spatial working memory in inefficient search, but the role of nonspatial working memory remains unclear. Here, we directly compared the role of spatial and nonspatial working memory for both an efficient and inefficient search task. In Experiment 1, we used a dual-task paradigm to investigate the effect of performing visual search within the retention interval of a spatial working memory task. Importantly, by incorporating two working memory loads (low and high) we were able to make comparisons between dual-task conditions, rather than between dual-task and single-task conditions. This design allows any interference effects observed to be attributed to changes in memory load, rather than to nonspecific effects related to "dual-task" performance. We found that the efficiency of the inefficient search task declined as spatial memory load increased, but that the efficient search task remained efficient. These results suggest that spatial memory plays an important role in inefficient but not efficient search. In Experiment 2, participants performed the same visual search tasks within the retention interval of visually matched spatial and verbal working memory tasks. Critically, we found comparable dual-task interference between inefficient search and both the spatial and nonspatial working memory tasks, indicating that inefficient search recruits working memory processes common to both domains. |
Elaine J Anderson; S K Mannan; G Rees; P Sumner; C Kennard Overlapping functional anatomy for working memory and visual search. Journal Article Experimental Brain Research, 200 (1), pp. 91–107, 2010. Abstract | Links | BibTeX @article{Anderson2010,
title = {Overlapping functional anatomy for working memory and visual search.},
author = {Elaine J Anderson and S K Mannan and G Rees and P Sumner and C Kennard},
url = {http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2800858&tool=pmcentrez&rendertype=abstract},
doi = {10.1007/s00221-009-2000-5},
year = {2010},
date = {2010-01-01},
journal = {Experimental Brain Research},
volume = {200},
number = {1},
pages = {91--107},
abstract = {Recent behavioural findings using dual-task paradigms demonstrate the importance of both spatial and non-spatial working memory processes in inefficient visual search (Anderson et al. in Exp Psychol 55:301-312, 2008). Here, using functional magnetic resonance imaging (fMRI), we sought to determine whether brain areas recruited during visual search are also involved in working memory. Using visually matched spatial and non-spatial working memory tasks, we confirmed previous behavioural findings that show significant dual-task interference effects occur when inefficient visual search is performed concurrently with either working memory task. Furthermore, we find considerable overlap in the cortical network activated by inefficient search and both working memory tasks. Our findings suggest that the interference effects observed behaviourally may have arisen from competition for cortical processes subserved by these overlapping regions. Drawing on previous findings (Anderson et al. in Exp Brain Res 180:289-302, 2007), we propose that the most likely anatomical locus for these interference effects is the inferior and middle frontal cortex of the right hemisphere. These areas are associated with attentional selection from memory as well as manipulation of information in memory, and we propose that the visual search and working memory tasks used here compete for common processing resources underlying these mechanisms.},
keywords = {},
pubstate = {published},
tppubtype = {article}
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Recent behavioural findings using dual-task paradigms demonstrate the importance of both spatial and non-spatial working memory processes in inefficient visual search (Anderson et al. in Exp Psychol 55:301-312, 2008). Here, using functional magnetic resonance imaging (fMRI), we sought to determine whether brain areas recruited during visual search are also involved in working memory. Using visually matched spatial and non-spatial working memory tasks, we confirmed previous behavioural findings that show significant dual-task interference effects occur when inefficient visual search is performed concurrently with either working memory task. Furthermore, we find considerable overlap in the cortical network activated by inefficient search and both working memory tasks. Our findings suggest that the interference effects observed behaviourally may have arisen from competition for cortical processes subserved by these overlapping regions. Drawing on previous findings (Anderson et al. in Exp Brain Res 180:289-302, 2007), we propose that the most likely anatomical locus for these interference effects is the inferior and middle frontal cortex of the right hemisphere. These areas are associated with attentional selection from memory as well as manipulation of information in memory, and we propose that the visual search and working memory tasks used here compete for common processing resources underlying these mechanisms. |
Brian A Anderson; Steven Yantis Value-driven attentional and oculomotor capture during goal-directed, unconstrained viewing Journal Article Attention, Perception, and Psychophysics, 74 , pp. 1644–1653, 2012. Abstract | Links | BibTeX @article{Anderson2012,
title = {Value-driven attentional and oculomotor capture during goal-directed, unconstrained viewing},
author = {Brian A Anderson and Steven Yantis},
doi = {10.3758/s13414-012-0348-2},
year = {2012},
date = {2012-01-01},
journal = {Attention, Perception, and Psychophysics},
volume = {74},
pages = {1644--1653},
abstract = {Covert shifts of attention precede and direct overt eye movements to stimuli that are task relevant or physically salient. A growing body of evidence suggests that the learned value of perceptual stimuli strongly influences their attentional priority. For example, previously rewarded but otherwise irrelevant and inconspicuous stimuli capture covert attention involuntarily. It is unknown, however, whether stimuli also draw eye movements involuntarily as a consequence of their reward history. Here, we show that previously rewarded but currently task-irrelevant stimuli capture both attention and the eyes. Value-driven oculomotor capture was observed during unconstrained viewing, when neither eye movements nor fixations were required, and was strongly related to individual differences in visual working memory capacity. The appearance of a reward-associated stimulus came to evoke pupil dilation over the course of training, which provides physiological evidence that the stimuli that elicit value-driven capture come to serve as reward-predictive cues. These findings reveal a close coupling of value-driven attentional capture and eye movements that has broad implications for theories of attention and reward learning.},
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Covert shifts of attention precede and direct overt eye movements to stimuli that are task relevant or physically salient. A growing body of evidence suggests that the learned value of perceptual stimuli strongly influences their attentional priority. For example, previously rewarded but otherwise irrelevant and inconspicuous stimuli capture covert attention involuntarily. It is unknown, however, whether stimuli also draw eye movements involuntarily as a consequence of their reward history. Here, we show that previously rewarded but currently task-irrelevant stimuli capture both attention and the eyes. Value-driven oculomotor capture was observed during unconstrained viewing, when neither eye movements nor fixations were required, and was strongly related to individual differences in visual working memory capacity. The appearance of a reward-associated stimulus came to evoke pupil dilation over the course of training, which provides physiological evidence that the stimuli that elicit value-driven capture come to serve as reward-predictive cues. These findings reveal a close coupling of value-driven attentional capture and eye movements that has broad implications for theories of attention and reward learning. |
Nicola C Anderson; Walter F Bischof; Kaitlin E W Laidlaw; Evan F Risko; Alan Kingstone Recurrence quantification analysis of eye movements Journal Article Behavior Research Methods, 45 , pp. 842–856, 2013. Abstract | Links | BibTeX @article{Anderson2013,
title = {Recurrence quantification analysis of eye movements},
author = {Nicola C Anderson and Walter F Bischof and Kaitlin E W Laidlaw and Evan F Risko and Alan Kingstone},
doi = {10.3758/s13428-012-0299-5},
year = {2013},
date = {2013-01-01},
journal = {Behavior Research Methods},
volume = {45},
pages = {842--856},
abstract = {Recurrence quantification analysis (RQA) has been successfully used for describing dynamic systems that are too complex to be characterized adequately by standard methods in time series analysis. More recently, RQA has been used for analyzing the coordination of gaze patterns between cooperating individuals. Here, we extend RQA to the characterization of fixation sequences, and we show that the global and local temporal characteristics of fixation sequences can be captured by a small number of RQA measures that have a clear interpretation in this context. We applied RQA to the analysis of a study in which observers looked at different scenes under natural or gaze-contingent viewing conditions, and we found large differences in the RQA measures between the viewing conditions, indicating that RQA is a powerful new tool for the analysis of the temporal patterns of eye movement behavior.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Recurrence quantification analysis (RQA) has been successfully used for describing dynamic systems that are too complex to be characterized adequately by standard methods in time series analysis. More recently, RQA has been used for analyzing the coordination of gaze patterns between cooperating individuals. Here, we extend RQA to the characterization of fixation sequences, and we show that the global and local temporal characteristics of fixation sequences can be captured by a small number of RQA measures that have a clear interpretation in this context. We applied RQA to the analysis of a study in which observers looked at different scenes under natural or gaze-contingent viewing conditions, and we found large differences in the RQA measures between the viewing conditions, indicating that RQA is a powerful new tool for the analysis of the temporal patterns of eye movement behavior. |
Giles M Anderson; Glyn W Humphreys Top-down expectancy versus bottom-up guidance in search for known color-form conjunctions Journal Article Attention, Perception, and Psychophysics, 77 (8), pp. 2622–2639, 2015. Abstract | Links | BibTeX @article{Anderson2015,
title = {Top-down expectancy versus bottom-up guidance in search for known color-form conjunctions},
author = {Giles M Anderson and Glyn W Humphreys},
url = {http://link.springer.com/10.3758/s13414-015-0960-z},
doi = {10.3758/s13414-015-0960-z},
year = {2015},
date = {2015-11-01},
journal = {Attention, Perception, and Psychophysics},
volume = {77},
number = {8},
pages = {2622--2639},
publisher = {Springer US},
abstract = {We assessed the effects of pairing a target object with its familiar color on eye movements in visual search, under conditions where the familiar color could or could not be predicted. In Experiment 1 participants searched for a yellow- or purple-colored corn target amongst aubergine distractors, half of which were yellow and half purple. Search was more efficient when the color of the target was familiar and early eye movements more likely to be directed to targets carrying a familiar color than an unfamiliar color. Ex- periment 2 introduced cues which predicted the target color at 80 % validity. Cue validity did not affect whether early fixations were to the target. Invalid cues, however, disrupted search efficiency for targets in an unfamiliar color whilst there was little cost to search efficiency for targets in their familiar color. These re- sults generalized across items with different colors (Experiment 3). The data are consistent with early pro- cesses in selection being automatically modulated in a bottom-up manner to targets in their familiar color, even when expectancies are set for other colors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We assessed the effects of pairing a target object with its familiar color on eye movements in visual search, under conditions where the familiar color could or could not be predicted. In Experiment 1 participants searched for a yellow- or purple-colored corn target amongst aubergine distractors, half of which were yellow and half purple. Search was more efficient when the color of the target was familiar and early eye movements more likely to be directed to targets carrying a familiar color than an unfamiliar color. Ex- periment 2 introduced cues which predicted the target color at 80 % validity. Cue validity did not affect whether early fixations were to the target. Invalid cues, however, disrupted search efficiency for targets in an unfamiliar color whilst there was little cost to search efficiency for targets in their familiar color. These re- sults generalized across items with different colors (Experiment 3). The data are consistent with early pro- cesses in selection being automatically modulated in a bottom-up manner to targets in their familiar color, even when expectancies are set for other colors. |
Nicola C Anderson; Fraser Anderson; Alan Kingstone; Walter F Bischof A comparison of scanpath comparison methods Journal Article Behavior Research Methods, 47 (4), pp. 1377–1392, 2015. Abstract | Links | BibTeX @article{Anderson2015a,
title = {A comparison of scanpath comparison methods},
author = {Nicola C Anderson and Fraser Anderson and Alan Kingstone and Walter F Bischof},
doi = {10.3758/s13428-014-0550-3},
year = {2015},
date = {2015-01-01},
journal = {Behavior Research Methods},
volume = {47},
number = {4},
pages = {1377--1392},
abstract = {Interest has flourished in studying both the spatial and temporal aspects of eye movement behavior. This has sparked the development of a large number of new methods to compare scanpaths. In the present work, we present a detailed overview of common scanpath comparison measures. Each of these measures was developed to solve a specific problem, but quantifies different aspects of scanpath behavior and requires different data-processing techniques. To understand these differences, we applied each scanpath comparison method to data from an encoding and recognition experiment and compared their ability to reveal scanpath similarities within and between individuals looking at natural scenes. Results are discussed in terms of the unique aspects of scanpath behavior that the different methods quantify. We conclude by making recommendations for choosing an appropriate scanpath comparison measure.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Interest has flourished in studying both the spatial and temporal aspects of eye movement behavior. This has sparked the development of a large number of new methods to compare scanpaths. In the present work, we present a detailed overview of common scanpath comparison measures. Each of these measures was developed to solve a specific problem, but quantifies different aspects of scanpath behavior and requires different data-processing techniques. To understand these differences, we applied each scanpath comparison method to data from an encoding and recognition experiment and compared their ability to reveal scanpath similarities within and between individuals looking at natural scenes. Results are discussed in terms of the unique aspects of scanpath behavior that the different methods quantify. We conclude by making recommendations for choosing an appropriate scanpath comparison measure. |
Nicola C Anderson; Eduard Ort; Wouter Kruijne; Martijn Meeter; Mieke Donk It depends on when you look at it: Salience influences eye movements in natural scene viewing and search early in time Journal Article Journal of Vision, 15 (5), pp. 1–22, 2015. Abstract | Links | BibTeX @article{Anderson2015b,
title = {It depends on when you look at it: Salience influences eye movements in natural scene viewing and search early in time},
author = {Nicola C Anderson and Eduard Ort and Wouter Kruijne and Martijn Meeter and Mieke Donk},
url = {http://jov.arvojournals.org/article.aspx?doi=10.1167/15.5.9},
doi = {10.1167/15.5.9.doi},
year = {2015},
date = {2015-01-01},
journal = {Journal of Vision},
volume = {15},
number = {5},
pages = {1--22},
abstract = {It is generally accepted that salience affects eye movements in simple artificially created search displays. However, no such consensus exists for eye movements in natural scenes, with several reports arguing that it is mostly high-level cognitive factors that control oculomotor behavior in natural scenes. Here, we manipulate the salience distribution across images by decreasing or increasing the contrast in a gradient across the image. We recorded eye movements in an encoding task (Experiment 1) and a visual search task (Experiment 2) and analyzed the relationship between the latency of fixations and subsequent saccade targeting throughout scene viewing. We find that short-latency first saccades are more likely to land on a region of the image with high salience than long-latency and subsequent saccades in both the encoding and visual search tasks. This implies that salience indeed influences oculomotor behavior in natural scenes, albeit on a different timescale than previously reported. We discuss our findings in relation to current theories of saccade control in natural scenes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
It is generally accepted that salience affects eye movements in simple artificially created search displays. However, no such consensus exists for eye movements in natural scenes, with several reports arguing that it is mostly high-level cognitive factors that control oculomotor behavior in natural scenes. Here, we manipulate the salience distribution across images by decreasing or increasing the contrast in a gradient across the image. We recorded eye movements in an encoding task (Experiment 1) and a visual search task (Experiment 2) and analyzed the relationship between the latency of fixations and subsequent saccade targeting throughout scene viewing. We find that short-latency first saccades are more likely to land on a region of the image with high salience than long-latency and subsequent saccades in both the encoding and visual search tasks. This implies that salience indeed influences oculomotor behavior in natural scenes, albeit on a different timescale than previously reported. We discuss our findings in relation to current theories of saccade control in natural scenes. |
Nicola C Anderson; Mieke Donk; Martijn Meeter The influence of a scene preview on eye movement behavior in natural scenes Journal Article Psychonomic Bulletin and Review, 23 , pp. 1794–1801, 2016. Abstract | Links | BibTeX @article{Anderson2016,
title = {The influence of a scene preview on eye movement behavior in natural scenes},
author = {Nicola C Anderson and Mieke Donk and Martijn Meeter},
url = {http://dx.doi.org/10.3758/s13423-016-1035-4},
doi = {10.3758/s13423-016-1035-4},
year = {2016},
date = {2016-01-01},
journal = {Psychonomic Bulletin and Review},
volume = {23},
pages = {1794--1801},
publisher = {Psychonomic Bulletin & Review},
abstract = {Rich contextual and semantic information can be extracted from only a brief presentation of a natural scene. This is presumed to be activated quickly enough to guide initial eye movements into a scene. However, early, short-latency eye movements in natural scenes have been shown to be dependent on the salience distribution across the image (Anderson, Ort, Kruijne, Meeter, & Donk, 2015). In the present work, we manipulated the salience distribution across a natural scene by changing the global contrast. We showed participants a brief real or nonsense preview of the scene and examined the time-course of eye movement guidance. A real preview decreased the latency and increased the amplitude of initial saccades into the image, suggesting that the preview allowed observers to obtain additional contextual information that would otherwise not be available. However, the preview did not completely override the initial tendency for short-latency saccades to be guided by the underlying salience distribution of the image. We discuss these findings in the context of oculomotor selection based on the integration of contextual information and low-level features in a natural scene.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Rich contextual and semantic information can be extracted from only a brief presentation of a natural scene. This is presumed to be activated quickly enough to guide initial eye movements into a scene. However, early, short-latency eye movements in natural scenes have been shown to be dependent on the salience distribution across the image (Anderson, Ort, Kruijne, Meeter, & Donk, 2015). In the present work, we manipulated the salience distribution across a natural scene by changing the global contrast. We showed participants a brief real or nonsense preview of the scene and examined the time-course of eye movement guidance. A real preview decreased the latency and increased the amplitude of initial saccades into the image, suggesting that the preview allowed observers to obtain additional contextual information that would otherwise not be available. However, the preview did not completely override the initial tendency for short-latency saccades to be guided by the underlying salience distribution of the image. We discuss these findings in the context of oculomotor selection based on the integration of contextual information and low-level features in a natural scene. |
Elaine J Anderson; Marc S Tibber; Sam D Schwarzkopf; Sukhwinder S Shergill; Emilio Fernandez-Egea; Geraint Rees; Steven C Dakin Visual population receptive fields in people with schizophrenia have reduced inhibitory surrounds Journal Article Journal of Neuroscience, 37 (6), pp. 1546–1556, 2017. Abstract | Links | BibTeX @article{Anderson2017,
title = {Visual population receptive fields in people with schizophrenia have reduced inhibitory surrounds},
author = {Elaine J Anderson and Marc S Tibber and Sam D Schwarzkopf and Sukhwinder S Shergill and Emilio Fernandez-Egea and Geraint Rees and Steven C Dakin},
url = {http://www.jneurosci.org/lookup/doi/10.1523/JNEUROSCI.3620-15.2016},
doi = {10.1523/JNEUROSCI.3620-15.2016},
year = {2017},
date = {2017-01-01},
journal = {Journal of Neuroscience},
volume = {37},
number = {6},
pages = {1546--1556},
abstract = {People with schizophrenia (SZ) experience abnormal visual perception on a range of visual tasks, which have been linked to abnormal synaptic transmission and an imbalance between cortical excitation and inhibition. However, differences in the underlying architecture of visual cortex neurons, which might explain these visual anomalies, have yet to be reportedin vivoHere, we probed the neural basis of these deficits using fMRI and population receptive field (pRF) mapping to infer properties of visually responsive neurons in people with SZ. We employed a difference-of-Gaussian model to capture the center-surround configuration of the pRF, providing critical information about the spatial scale of the pRFs inhibitory surround. Our analysis reveals that SZ is associated with reduced pRF size in early retinotopic visual cortex, as well as a reduction in size and depth of the inhibitory surround in V1, V2, and V4. We consider how reduced inhibition might explain the diverse range of visual deficits reported in SZ.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
People with schizophrenia (SZ) experience abnormal visual perception on a range of visual tasks, which have been linked to abnormal synaptic transmission and an imbalance between cortical excitation and inhibition. However, differences in the underlying architecture of visual cortex neurons, which might explain these visual anomalies, have yet to be reportedin vivoHere, we probed the neural basis of these deficits using fMRI and population receptive field (pRF) mapping to infer properties of visually responsive neurons in people with SZ. We employed a difference-of-Gaussian model to capture the center-surround configuration of the pRF, providing critical information about the spatial scale of the pRFs inhibitory surround. Our analysis reveals that SZ is associated with reduced pRF size in early retinotopic visual cortex, as well as a reduction in size and depth of the inhibitory surround in V1, V2, and V4. We consider how reduced inhibition might explain the diverse range of visual deficits reported in SZ. |
Nicola C Anderson; Mieke Donk Salient object changes influence overt attentional prioritization and object-based targeting in natural scenes Journal Article PLoS ONE, 12 (2), pp. 1–14, 2017. Abstract | Links | BibTeX @article{Anderson2017a,
title = {Salient object changes influence overt attentional prioritization and object-based targeting in natural scenes},
author = {Nicola C Anderson and Mieke Donk},
doi = {10.1371/journal.pone.0172132},
year = {2017},
date = {2017-01-01},
journal = {PLoS ONE},
volume = {12},
number = {2},
pages = {1--14},
abstract = {A change to an object in natural scenes attracts attention when it occurs during a fixation. However, when a change occurs during a saccade, and is masked by saccadic suppression, it typically does not capture the gaze in a bottom- up manner. In the present work, we investigated how the type and direction of salient changes to objects affect the prioritization and targeting of objects in natural scenes. We asked observers to look around a scene in preparation for a later memory test. After a period of time, an object in the scene was increased or decreased in salience either during a fixation (with a transient signal) or during a saccade (without transient signal), or it was not changed at all. Changes that were made during a fixation attracted the eyes both when the change involved an increase and a decrease in salience. However, changes that were made during a saccade only captured the eyes when the change was an increase in salience, relative to the baseline no-change condition. These results suggest that the prioritization of object changes can be influenced by the underlying salience of the changed object. In addition, object changes that occurred with a transient signal (which is itself a salient signal) resulted in more central object targeting. Taken together, our results suggest that salient signals in a natural scene are an important component in both object prioritization and targeting in natural scene viewing, insofar as they align with object locations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A change to an object in natural scenes attracts attention when it occurs during a fixation. However, when a change occurs during a saccade, and is masked by saccadic suppression, it typically does not capture the gaze in a bottom- up manner. In the present work, we investigated how the type and direction of salient changes to objects affect the prioritization and targeting of objects in natural scenes. We asked observers to look around a scene in preparation for a later memory test. After a period of time, an object in the scene was increased or decreased in salience either during a fixation (with a transient signal) or during a saccade (without transient signal), or it was not changed at all. Changes that were made during a fixation attracted the eyes both when the change involved an increase and a decrease in salience. However, changes that were made during a saccade only captured the eyes when the change was an increase in salience, relative to the baseline no-change condition. These results suggest that the prioritization of object changes can be influenced by the underlying salience of the changed object. In addition, object changes that occurred with a transient signal (which is itself a salient signal) resulted in more central object targeting. Taken together, our results suggest that salient signals in a natural scene are an important component in both object prioritization and targeting in natural scene viewing, insofar as they align with object locations. |
Ulrich Ansorge; Heinz-Werner Priess; Dirk Kerzel Effects of relevant and irrelevant color singletons on inhibition of return and attentional capture Journal Article Attention, Perception, and Psychophysics, 75 (8), pp. 1687–1702, 2013. Abstract | Links | BibTeX @article{Ansorge2013,
title = {Effects of relevant and irrelevant color singletons on inhibition of return and attentional capture},
author = {Ulrich Ansorge and Heinz-Werner Priess and Dirk Kerzel},
doi = {10.3758/s13414-013-0521-2},
year = {2013},
date = {2013-01-01},
journal = {Attention, Perception, and Psychophysics},
volume = {75},
number = {8},
pages = {1687--1702},
abstract = {We tested whether color singletons lead to saccadic and manual inhibition of return (IOR; i.e., slower responses at cued locations) and whether IOR depended on the relevance of the color singletons. The target display was preceded by a nonpredictive cue display. In three experiments, half of the cues were response-relevant, because participants had to perform a discrimination task at the cued location. With the exception of Experiment 2, none of the cue colors matched the target color. We observed saccadic IOR after color singletons, which was greater for slow than for fast responses. Furthermore, when the relevant cue color matched the target color, we observed attentional capture (i.e., faster responses at cued locations) with rapid responses, but IOR with slower responses, which provides evidence for attentional deallocation. When the cue display was completely response-irrelevant in two additional experiments, we did not find evidence for IOR. Instead, we found attentional capture when the cue color matched the target color. Also, attentional capture was greater for rapid responses and with short cue-target intervals. Thus, IOR emerges when cues are relevant and do not match the target color, whereas attentional capture emerges with relevant and irrelevant cues that match the target color.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We tested whether color singletons lead to saccadic and manual inhibition of return (IOR; i.e., slower responses at cued locations) and whether IOR depended on the relevance of the color singletons. The target display was preceded by a nonpredictive cue display. In three experiments, half of the cues were response-relevant, because participants had to perform a discrimination task at the cued location. With the exception of Experiment 2, none of the cue colors matched the target color. We observed saccadic IOR after color singletons, which was greater for slow than for fast responses. Furthermore, when the relevant cue color matched the target color, we observed attentional capture (i.e., faster responses at cued locations) with rapid responses, but IOR with slower responses, which provides evidence for attentional deallocation. When the cue display was completely response-irrelevant in two additional experiments, we did not find evidence for IOR. Instead, we found attentional capture when the cue color matched the target color. Also, attentional capture was greater for rapid responses and with short cue-target intervals. Thus, IOR emerges when cues are relevant and do not match the target color, whereas attentional capture emerges with relevant and irrelevant cues that match the target color. |
Katharina Anton-Erxleben; Katrin Herrmann; Marisa Carrasco Independent Effects of Adaptation and Attention on Perceived Speed Journal Article Psychological Science, 24 (2), pp. 150–159, 2013. Abstract | Links | BibTeX @article{Anton-Erxleben2013,
title = {Independent Effects of Adaptation and Attention on Perceived Speed},
author = {Katharina Anton-Erxleben and Katrin Herrmann and Marisa Carrasco},
doi = {10.1177/0956797612449178},
year = {2013},
date = {2013-01-01},
journal = {Psychological Science},
volume = {24},
number = {2},
pages = {150--159},
abstract = {Adaptation and attention are two mechanisms by which sensory systems manage limited bioenergetic resources: Whereas adaptation decreases sensitivity to stimuli just encountered, attention increases sensitivity to behaviorally relevant stimuli. In the visual system, these changes in sensitivity are accompanied by a change in the appearance of different stimulus dimensions, such as speed. Adaptation causes an underestimation of speed, whereas attention leads to an overestimation of speed. In the two experiments reported here, we investigated whether the effects of these mechanisms interact and how they affect the appearance of stimulus features. We tested the effects of adaptation and the subsequent allocation of attention on perceived speed. A quickly moving adaptor decreased the perceived speed of subsequent stimuli, whereas a slow adaptor did not alter perceived speed. Attention increased perceived speed regardless of the adaptation effect, which indicates that adaptation and attention affect perceived speed independently. Moreover, the finding that attention can alter perceived speed after adaptation indicates that adaptation is not merely a by-product of neuronal fatigue.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Adaptation and attention are two mechanisms by which sensory systems manage limited bioenergetic resources: Whereas adaptation decreases sensitivity to stimuli just encountered, attention increases sensitivity to behaviorally relevant stimuli. In the visual system, these changes in sensitivity are accompanied by a change in the appearance of different stimulus dimensions, such as speed. Adaptation causes an underestimation of speed, whereas attention leads to an overestimation of speed. In the two experiments reported here, we investigated whether the effects of these mechanisms interact and how they affect the appearance of stimulus features. We tested the effects of adaptation and the subsequent allocation of attention on perceived speed. A quickly moving adaptor decreased the perceived speed of subsequent stimuli, whereas a slow adaptor did not alter perceived speed. Attention increased perceived speed regardless of the adaptation effect, which indicates that adaptation and attention affect perceived speed independently. Moreover, the finding that attention can alter perceived speed after adaptation indicates that adaptation is not merely a by-product of neuronal fatigue. |
Evan G Antzoulatos; Earl K Miller Synchronous beta rhythms of frontoparietal networks support only behaviorally relevant representations Journal Article eLife, 5 (NOVEMBER2016), pp. 1–22, 2016. Abstract | Links | BibTeX @article{Antzoulatos2016,
title = {Synchronous beta rhythms of frontoparietal networks support only behaviorally relevant representations},
author = {Evan G Antzoulatos and Earl K Miller},
doi = {10.7554/eLife.17822},
year = {2016},
date = {2016-01-01},
journal = {eLife},
volume = {5},
number = {NOVEMBER2016},
pages = {1--22},
abstract = {Categorization has been associated with distributed networks of the primate brain, including the prefrontal (PFC) and posterior parietal cortices (PPC). Although category-selective spiking in PFC and PPC has been established, the frequency-dependent dynamic interactions of frontoparietal networks are largely unexplored. We trained monkeys to perform a delayed-match-to-spatial-category task while recording spikes and local field potentials from the PFC and PPC with multiple electrodes. We found category-selective beta- and delta-band synchrony between and within the areas. However, in addition to the categories, delta synchrony and spiking activity also reflected irrelevant stimulus dimensions. By contrast, beta synchrony only conveyed information about the task-relevant categories. Further, category-selective PFC neurons were synchronized with PPC beta oscillations, while neurons that carried irrelevant information were not. These results suggest that long-range beta-band synchrony could act as a filter that only supports neural representations of the variables relevant to the task at hand.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Categorization has been associated with distributed networks of the primate brain, including the prefrontal (PFC) and posterior parietal cortices (PPC). Although category-selective spiking in PFC and PPC has been established, the frequency-dependent dynamic interactions of frontoparietal networks are largely unexplored. We trained monkeys to perform a delayed-match-to-spatial-category task while recording spikes and local field potentials from the PFC and PPC with multiple electrodes. We found category-selective beta- and delta-band synchrony between and within the areas. However, in addition to the categories, delta synchrony and spiking activity also reflected irrelevant stimulus dimensions. By contrast, beta synchrony only conveyed information about the task-relevant categories. Further, category-selective PFC neurons were synchronized with PPC beta oscillations, while neurons that carried irrelevant information were not. These results suggest that long-range beta-band synchrony could act as a filter that only supports neural representations of the variables relevant to the task at hand. |
Paul L Aparicio; Elias B Issa; James J DiCarlo Neurophysiological organization of the middle face patch in macaque inferior temporal cortex Journal Article Journal of Neuroscience, 36 (50), pp. 12729–12745, 2016. Abstract | Links | BibTeX @article{Aparicio2016,
title = {Neurophysiological organization of the middle face patch in macaque inferior temporal cortex},
author = {Paul L Aparicio and Elias B Issa and James J DiCarlo},
url = {http://www.jneurosci.org/lookup/doi/10.1523/JNEUROSCI.0237-16.2016},
doi = {10.1523/JNEUROSCI.0237-16.2016},
year = {2016},
date = {2016-01-01},
journal = {Journal of Neuroscience},
volume = {36},
number = {50},
pages = {12729--12745},
abstract = {While early cortical visual areas contain fine scale spatial organization of neuronal properties such as orientation preference, the spatial organization of higher-level visual areas is less well understood. The fMRI demonstration of face preferring regions in human ventral cortex (FFA, OFA) and monkey inferior temporal cortex ("face patches") raises the question of how neural selectivity for faces is organized. Here, we targeted hundreds of spatially registered neural recordings to the largest fMRI-identified face selective region in monkeys, the middle face patch (MFP) and show that the MFP contains a graded enrichment of face preferring neurons. At its center, as much as 93% of the sites we sampled responded twice as strongly to faces than to non-face objects. We estimate the maximum neurophysiological size of the MFP to be ∼6 mm in diameter, consistent with its previously reported size under fMRI. Importantly, face selectivity in the MFP varied strongly even between neighboring sites. Additionally, extremely face selective sites were ∼50x more likely to be present inside the MFP than outside. These results provide the first direct quantification of the size and neural composition of the MFP by showing that the cortical tissue localized to the fMRI defined region consists of a very high fraction of face preferring sites near its center, and a monotonic decrease in that fraction along any radial spatial axis.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
While early cortical visual areas contain fine scale spatial organization of neuronal properties such as orientation preference, the spatial organization of higher-level visual areas is less well understood. The fMRI demonstration of face preferring regions in human ventral cortex (FFA, OFA) and monkey inferior temporal cortex ("face patches") raises the question of how neural selectivity for faces is organized. Here, we targeted hundreds of spatially registered neural recordings to the largest fMRI-identified face selective region in monkeys, the middle face patch (MFP) and show that the MFP contains a graded enrichment of face preferring neurons. At its center, as much as 93% of the sites we sampled responded twice as strongly to faces than to non-face objects. We estimate the maximum neurophysiological size of the MFP to be ∼6 mm in diameter, consistent with its previously reported size under fMRI. Importantly, face selectivity in the MFP varied strongly even between neighboring sites. Additionally, extremely face selective sites were ∼50x more likely to be present inside the MFP than outside. These results provide the first direct quantification of the size and neural composition of the MFP by showing that the cortical tissue localized to the fMRI defined region consists of a very high fraction of face preferring sites near its center, and a monotonic decrease in that fraction along any radial spatial axis. |
Jens K Apel; Gavin F Revie; Angelo Cangelosi; Rob Ellis; Jeremy Goslin; Martin H Fischer Attention deployment during memorizing and executing complex instructions Journal Article Experimental Brain Research, 214 (2), pp. 249–259, 2011. Abstract | Links | BibTeX @article{Apel2011,
title = {Attention deployment during memorizing and executing complex instructions},
author = {Jens K Apel and Gavin F Revie and Angelo Cangelosi and Rob Ellis and Jeremy Goslin and Martin H Fischer},
doi = {10.1007/s00221-011-2827-4},
year = {2011},
date = {2011-01-01},
journal = {Experimental Brain Research},
volume = {214},
number = {2},
pages = {249--259},
abstract = {We investigated the mental rehearsal of complex action instructions by recording spontaneous eye movements of healthy adults as they looked at objects on a monitor. Participants heard consecutive instructions, each of the form "move [object] to [location]". Instructions were only to be executed after a go signal, by manipulating all objects successively with a mouse. Participants re-inspected previously mentioned objects already while listening to further instructions. This rehearsal behavior broke down after 4 instructions, coincident with participants' instruction span, as determined from subsequent execution accuracy. These results suggest that spontaneous eye movements while listening to instructions predict their successful execution.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We investigated the mental rehearsal of complex action instructions by recording spontaneous eye movements of healthy adults as they looked at objects on a monitor. Participants heard consecutive instructions, each of the form "move [object] to [location]". Instructions were only to be executed after a go signal, by manipulating all objects successively with a mouse. Participants re-inspected previously mentioned objects already while listening to further instructions. This rehearsal behavior broke down after 4 instructions, coincident with participants' instruction span, as determined from subsequent execution accuracy. These results suggest that spontaneous eye movements while listening to instructions predict their successful execution. |
Keith S Apfelbaum; Bob McMurray Learning during processing: Word learning doesn't wait for word recognition to finish Journal Article Cognitive Science, 41 , pp. 706–747, 2017. Abstract | Links | BibTeX @article{Apfelbaum2017,
title = {Learning during processing: Word learning doesn't wait for word recognition to finish},
author = {Keith S Apfelbaum and Bob McMurray},
doi = {10.1111/cogs.12401},
year = {2017},
date = {2017-01-01},
journal = {Cognitive Science},
volume = {41},
pages = {706--747},
abstract = {Previous research on associative learning has uncovered detailed aspects of the process, includ- ing what types of things are learned, how they are learned, and where in the brain such learning occurs. However, perceptual processes, such as stimulus recognition and identification, take time to unfold. Previous studies of learning have not addressed when, during the course of these dynamic recognition processes, learned representations are formed and updated. If learned representations are formed and updated while recognition is ongoing, the result of learning may incorporate spurious, partial information. For example, during word recognition, words take time to be identified, and competing words are often active in parallel. If learning proceeds before this competition resolves, representations may be influenced by the preliminary activations present at the time of learning. In three experiments using word learning as a model domain, we provide evidence that learning reflects the ongoing dynamics of auditory and visual processing during a learn- ing event. These results show that learning can occur before stimulus recognition processes are complete; learning does not wait for ongoing perceptual processing to complete.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Previous research on associative learning has uncovered detailed aspects of the process, includ- ing what types of things are learned, how they are learned, and where in the brain such learning occurs. However, perceptual processes, such as stimulus recognition and identification, take time to unfold. Previous studies of learning have not addressed when, during the course of these dynamic recognition processes, learned representations are formed and updated. If learned representations are formed and updated while recognition is ongoing, the result of learning may incorporate spurious, partial information. For example, during word recognition, words take time to be identified, and competing words are often active in parallel. If learning proceeds before this competition resolves, representations may be influenced by the preliminary activations present at the time of learning. In three experiments using word learning as a model domain, we provide evidence that learning reflects the ongoing dynamics of auditory and visual processing during a learn- ing event. These results show that learning can occur before stimulus recognition processes are complete; learning does not wait for ongoing perceptual processing to complete. |
Eduardo A Aponte; Dario Schöbi; Klaas E Stephan; Jakob Heinzle The stochastic early reaction, inhibition, and late action (SERIA) model for antisaccades Book 2017. Abstract | Links | BibTeX @book{Aponte2017,
title = {The stochastic early reaction, inhibition, and late action (SERIA) model for antisaccades},
author = {Eduardo A Aponte and Dario Schöbi and Klaas E Stephan and Jakob Heinzle},
doi = {10.1371/journal.pcbi.1005692},
year = {2017},
date = {2017-01-01},
booktitle = {PLoS computational biology},
volume = {13},
number = {8},
pages = {1--36},
abstract = {The antisaccade task is a classic paradigm used to study the voluntary control of eye movements. It requires participants to suppress a reactive eye movement to a visual target and to concurrently initiate a saccade in the opposite direction. Although several models have been proposed to explain error rates and reaction times in this task, no formal model comparison has yet been performed. Here, we describe a Bayesian modeling approach to the antisaccade task that allows us to formally compare different models on the basis of their evidence. First, we provide a formal likelihood function of actions (pro- and antisaccades) and reaction times based on previously published models. Second, we introduce the Stochastic Early Reaction, Inhibition, and late Action model (SERIA), a novel model postulating two different mechanisms that interact in the antisaccade task: an early GO/NO-GO race decision process and a late GO/GO decision process. Third, we apply these models to a data set from an experiment with three mixed blocks of pro- and antisaccade trials. Bayesian model comparison demonstrates that the SERIA model explains the data better than competing models that do not incorporate a late decision process. Moreover, we show that the early decision process postulated by the SERIA model is, to a large extent, insensitive to the cue presented in a single trial. Finally, we use parameter estimates to demonstrate that changes in reaction time and error rate due to the probability of a trial type (pro- or antisaccade) are best explained by faster or slower inhibition and the probability of generating late voluntary prosaccades.},
keywords = {},
pubstate = {published},
tppubtype = {book}
}
The antisaccade task is a classic paradigm used to study the voluntary control of eye movements. It requires participants to suppress a reactive eye movement to a visual target and to concurrently initiate a saccade in the opposite direction. Although several models have been proposed to explain error rates and reaction times in this task, no formal model comparison has yet been performed. Here, we describe a Bayesian modeling approach to the antisaccade task that allows us to formally compare different models on the basis of their evidence. First, we provide a formal likelihood function of actions (pro- and antisaccades) and reaction times based on previously published models. Second, we introduce the Stochastic Early Reaction, Inhibition, and late Action model (SERIA), a novel model postulating two different mechanisms that interact in the antisaccade task: an early GO/NO-GO race decision process and a late GO/GO decision process. Third, we apply these models to a data set from an experiment with three mixed blocks of pro- and antisaccade trials. Bayesian model comparison demonstrates that the SERIA model explains the data better than competing models that do not incorporate a late decision process. Moreover, we show that the early decision process postulated by the SERIA model is, to a large extent, insensitive to the cue presented in a single trial. Finally, we use parameter estimates to demonstrate that changes in reaction time and error rate due to the probability of a trial type (pro- or antisaccade) are best explained by faster or slower inhibition and the probability of generating late voluntary prosaccades. |
Ayelet Arazi; Nitzan Censor; Ilan Dinstein Neural variability quenching predicts individual perceptual abilities Journal Article Journal of Neuroscience, 37 (1), pp. 97–109, 2017. Abstract | Links | BibTeX @article{Arazi2017,
title = {Neural variability quenching predicts individual perceptual abilities},
author = {Ayelet Arazi and Nitzan Censor and Ilan Dinstein},
url = {http://www.jneurosci.org/lookup/doi/10.1523/JNEUROSCI.1671-16.2016},
doi = {10.1523/JNEUROSCI.1671-16.2017},
year = {2017},
date = {2017-01-01},
journal = {Journal of Neuroscience},
volume = {37},
number = {1},
pages = {97--109},
abstract = {Neural activity during repeated presentations ofa sensory stimulus exhibits considerable trial-by-trial variability. Previous studies have reported that trial-by-trial neural variability is reduced (quenched) by the presentation of a stimulus. However, the functional significance and behavioral relevance ofvariability quenching and the potential physiological mechanisms that may drive it have been studied only rarely. Here, we recorded neural activity with EEG as subjects performed a two-interval forced-choice contrast discrimination task. Trial-by-trial neural variability was quenched by⬃40% after the presentation ofthe stimulus relative to the variability apparent before stimulus presentation, yet there were large differences in the magnitude ofvariability quenching across subjects. Individual magnitudes of quenching predicted individual discrimination capabilities such that subjects who exhibited larger quenching had smaller contrast discrimination thresholds and steeper psychometric function slopes. Furthermore, the magnitude ofvariability quenching was strongly correlated with a reduction in broadband EEGpower after stimulus presentation. Our results suggest that neural variability quenching is achieved by reducing the amplitude of broadband neural oscillations after sensory input, which yields relatively more reproducible cortical activity across trials and enables superior perceptual abilities in individuals who quench more.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Neural activity during repeated presentations ofa sensory stimulus exhibits considerable trial-by-trial variability. Previous studies have reported that trial-by-trial neural variability is reduced (quenched) by the presentation of a stimulus. However, the functional significance and behavioral relevance ofvariability quenching and the potential physiological mechanisms that may drive it have been studied only rarely. Here, we recorded neural activity with EEG as subjects performed a two-interval forced-choice contrast discrimination task. Trial-by-trial neural variability was quenched by⬃40% after the presentation ofthe stimulus relative to the variability apparent before stimulus presentation, yet there were large differences in the magnitude ofvariability quenching across subjects. Individual magnitudes of quenching predicted individual discrimination capabilities such that subjects who exhibited larger quenching had smaller contrast discrimination thresholds and steeper psychometric function slopes. Furthermore, the magnitude ofvariability quenching was strongly correlated with a reduction in broadband EEGpower after stimulus presentation. Our results suggest that neural variability quenching is achieved by reducing the amplitude of broadband neural oscillations after sensory input, which yields relatively more reproducible cortical activity across trials and enables superior perceptual abilities in individuals who quench more. |
Joseph Arizpe; Dwight J Kravitz; Galit Yovel; Chris I Baker Start position strongly influences fixation patterns during face processing: Difficulties with eye movements as a measure of information use Journal Article PLoS ONE, 7 (2), pp. 1–17, 2012. Abstract | Links | BibTeX @article{Arizpe2012,
title = {Start position strongly influences fixation patterns during face processing: Difficulties with eye movements as a measure of information use},
author = {Joseph Arizpe and Dwight J Kravitz and Galit Yovel and Chris I Baker},
doi = {10.1371/journal.pone.0031106},
year = {2012},
date = {2012-01-01},
journal = {PLoS ONE},
volume = {7},
number = {2},
pages = {1--17},
abstract = {Fixation patterns are thought to reflect cognitive processing and, thus, index the most informative stimulus features for task performance. During face recognition, initial fixations to the center of the nose have been taken to indicate this location is optimal for information extraction. However, the use of fixations as a marker for information use rests on the assumption that fixation patterns are predominantly determined by stimulus and task, despite the fact that fixations are also influenced by visuo-motor factors. Here, we tested the effect of starting position on fixation patterns during a face recognition task with upright and inverted faces. While we observed differences in fixations between upright and inverted faces, likely reflecting differences in cognitive processing, there was also a strong effect of start position. Over the first five saccades, fixation patterns across start positions were only coarsely similar, with most fixations around the eyes. Importantly, however, the precise fixation pattern was highly dependent on start position with a strong tendency toward facial features furthest from the start position. For example, the often-reported tendency toward the left over right eye was reversed for the left starting position. Further, delayed initial saccades for central versus peripheral start positions suggest greater information processing prior to the initial saccade, highlighting the experimental bias introduced by the commonly used center start position. Finally, the precise effect of face inversion on fixation patterns was also dependent on start position. These results demonstrate the importance of a non-stimulus, non-task factor in determining fixation patterns. The patterns observed likely reflect a complex combination of visuo-motor effects and simple sampling strategies as well as cognitive factors. These different factors are very difficult to tease apart and therefore great caution must be applied when interpreting absolute fixation locations as indicative of information use, particularly at a fine spatial scale.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Fixation patterns are thought to reflect cognitive processing and, thus, index the most informative stimulus features for task performance. During face recognition, initial fixations to the center of the nose have been taken to indicate this location is optimal for information extraction. However, the use of fixations as a marker for information use rests on the assumption that fixation patterns are predominantly determined by stimulus and task, despite the fact that fixations are also influenced by visuo-motor factors. Here, we tested the effect of starting position on fixation patterns during a face recognition task with upright and inverted faces. While we observed differences in fixations between upright and inverted faces, likely reflecting differences in cognitive processing, there was also a strong effect of start position. Over the first five saccades, fixation patterns across start positions were only coarsely similar, with most fixations around the eyes. Importantly, however, the precise fixation pattern was highly dependent on start position with a strong tendency toward facial features furthest from the start position. For example, the often-reported tendency toward the left over right eye was reversed for the left starting position. Further, delayed initial saccades for central versus peripheral start positions suggest greater information processing prior to the initial saccade, highlighting the experimental bias introduced by the commonly used center start position. Finally, the precise effect of face inversion on fixation patterns was also dependent on start position. These results demonstrate the importance of a non-stimulus, non-task factor in determining fixation patterns. The patterns observed likely reflect a complex combination of visuo-motor effects and simple sampling strategies as well as cognitive factors. These different factors are very difficult to tease apart and therefore great caution must be applied when interpreting absolute fixation locations as indicative of information use, particularly at a fine spatial scale. |
Joseph M Arizpe; Vincent Walsh; Chris I Baker Characteristic visuomotor influences on eye-movement patterns to faces and other high level stimuli Journal Article Frontiers in Psychology, 6 , pp. 1–14, 2015. Abstract | Links | BibTeX @article{Arizpe2015,
title = {Characteristic visuomotor influences on eye-movement patterns to faces and other high level stimuli},
author = {Joseph M Arizpe and Vincent Walsh and Chris I Baker},
url = {http://journal.frontiersin.org/Article/10.3389/fpsyg.2015.01027/abstract},
doi = {10.3389/fpsyg.2015.01027},
year = {2015},
date = {2015-01-01},
journal = {Frontiers in Psychology},
volume = {6},
pages = {1--14},
abstract = {Eye-movement patterns are often utilized in studies of visual perception as indices of the specific information extracted to efficiently process a given stimulus during a given task. Our prior work, however, revealed that not only the stimulus and task influence eye-movements, but that visuomotor (start position) factors also robustly and characteristically influence eye-movement patterns to faces (Arizpe et al., 2012). Here we manipulated lateral starting side and distance from the midline of face and line-symmetrical control (butterfly) stimuli in order to further investigate the nature and generality of such visuomotor influences. First we found that increasing starting distance from midline (4°, 8°, 12°, and 16° visual angle) strongly and proportionately increased the distance of the first ordinal fixation from midline. We did not find influences of starting distance on subsequent fixations, however, suggesting that eye-movement plans are not strongly affected by starting distance following an initial orienting fixation. Further, we replicated our prior effect of starting side (left, right) to induce a spatially contralateral tendency of fixations after the first ordinal fixation. However, we also established that these visuomotor influences did not depend upon the predictability of the location of the upcoming stimulus, and were present not only for face stimuli but also for our control stimulus category (butterflies). We found a correspondence in overall left-lateralized fixation tendency between faces and butterflies. Finally, for faces, we found a relationship between left starting side (right sided fixation pattern tendency) and increased recognition performance, which likely reflects a cortical right hemisphere (left visual hemifield) advantage for face perception. These results further indicate the importance of considering and controlling for visuomotor influences in the design, analysis, and interpretation of eye-movement studies.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Eye-movement patterns are often utilized in studies of visual perception as indices of the specific information extracted to efficiently process a given stimulus during a given task. Our prior work, however, revealed that not only the stimulus and task influence eye-movements, but that visuomotor (start position) factors also robustly and characteristically influence eye-movement patterns to faces (Arizpe et al., 2012). Here we manipulated lateral starting side and distance from the midline of face and line-symmetrical control (butterfly) stimuli in order to further investigate the nature and generality of such visuomotor influences. First we found that increasing starting distance from midline (4°, 8°, 12°, and 16° visual angle) strongly and proportionately increased the distance of the first ordinal fixation from midline. We did not find influences of starting distance on subsequent fixations, however, suggesting that eye-movement plans are not strongly affected by starting distance following an initial orienting fixation. Further, we replicated our prior effect of starting side (left, right) to induce a spatially contralateral tendency of fixations after the first ordinal fixation. However, we also established that these visuomotor influences did not depend upon the predictability of the location of the upcoming stimulus, and were present not only for face stimuli but also for our control stimulus category (butterflies). We found a correspondence in overall left-lateralized fixation tendency between faces and butterflies. Finally, for faces, we found a relationship between left starting side (right sided fixation pattern tendency) and increased recognition performance, which likely reflects a cortical right hemisphere (left visual hemifield) advantage for face perception. These results further indicate the importance of considering and controlling for visuomotor influences in the design, analysis, and interpretation of eye-movement studies. |
Joseph Arizpe; Dwight J Kravitz; Vincent Walsh; Galit Yovel; Chris I Baker Differences in looking at own-and other-race faces are subtle and analysis-dependent: An account of discrepant reports Journal Article PLoS ONE, 11 (2), pp. 1–25, 2016. Abstract | Links | BibTeX @article{Arizpe2016,
title = {Differences in looking at own-and other-race faces are subtle and analysis-dependent: An account of discrepant reports},
author = {Joseph Arizpe and Dwight J Kravitz and Vincent Walsh and Galit Yovel and Chris I Baker},
doi = {10.1371/journal.pone.0148253},
year = {2016},
date = {2016-01-01},
journal = {PLoS ONE},
volume = {11},
number = {2},
pages = {1--25},
abstract = {The Other-Race Effect (ORE) is the robust and well-established finding that people are generally poorer at facial recognition of individuals of another race than of their own race. Over the past four decades, much research has focused on the ORE because understanding this phenomenon is expected to elucidate fundamental face processingmechanisms and the influence of experience on such mechanisms. Several recent studies of the ORE in which the eye-movements of participants viewing own- and other-race faces were tracked have, however, reported highly conflicting results regarding the presence or absence of differential patterns of eye-movements to own- versus other-race faces. This discrepancy, of course, leads to conflicting theoretical interpretations of the perceptual basis for the ORE. Here we investigate fixation patterns to own- versus other-race (African and Chinese) faces for Caucasian participants using},
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The Other-Race Effect (ORE) is the robust and well-established finding that people are generally poorer at facial recognition of individuals of another race than of their own race. Over the past four decades, much research has focused on the ORE because understanding this phenomenon is expected to elucidate fundamental face processingmechanisms and the influence of experience on such mechanisms. Several recent studies of the ORE in which the eye-movements of participants viewing own- and other-race faces were tracked have, however, reported highly conflicting results regarding the presence or absence of differential patterns of eye-movements to own- versus other-race faces. This discrepancy, of course, leads to conflicting theoretical interpretations of the perceptual basis for the ORE. Here we investigate fixation patterns to own- versus other-race (African and Chinese) faces for Caucasian participants using |
Joseph M Arizpe; Danielle L McKean; Jack W Tsao; Annie W -Y Chan Where you look matters for body perception: Preferred gaze location contributes to the body inversion effect Journal Article PLoS ONE, 12 (1), pp. 1–24, 2017. Abstract | Links | BibTeX @article{Arizpe2017a,
title = {Where you look matters for body perception: Preferred gaze location contributes to the body inversion effect},
author = {Joseph M Arizpe and Danielle L McKean and Jack W Tsao and Annie W -Y Chan},
doi = {10.1371/journal.pone.0169148},
year = {2017},
date = {2017-01-01},
journal = {PLoS ONE},
volume = {12},
number = {1},
pages = {1--24},
abstract = {The Body Inversion Effect (BIE; reduced visual discrimination performance for inverted compared to upright bodies) suggests that bodies are visually processed configurally; how- ever, the specific importance of head posture information in the BIE has been indicated in reports of BIE reduction for whole bodies with fixed head position and for headless bodies. Through measurement of gaze patterns and investigation of the causal relation of fixation location to visual body discrimination performance, the present study reveals joint contribu- tions of feature and configuration processing to visual body discrimination. Participants pre- dominantly gazed at the (body-centric) upper body for upright bodies and the lower body for inverted bodies in the context of an experimental paradigm directly comparable to that of prior studies of the BIE. Subsequent manipulation of fixation location indicates that these preferential gaze locations causally contributed to the BIE for whole bodies largely due to the informative nature of gazing at or near the head. Also, a BIE was detected for both whole and headless bodies even when fixation location on the body was held constant, indi- cating a role of configural processing in body discrimination, though inclusion of the head posture information was still highly discriminative in the context of such processing. Interest- ingly, the impact of configuration (upright and inverted) to the BIE appears greater than that of differential preferred gaze locations.},
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The Body Inversion Effect (BIE; reduced visual discrimination performance for inverted compared to upright bodies) suggests that bodies are visually processed configurally; how- ever, the specific importance of head posture information in the BIE has been indicated in reports of BIE reduction for whole bodies with fixed head position and for headless bodies. Through measurement of gaze patterns and investigation of the causal relation of fixation location to visual body discrimination performance, the present study reveals joint contribu- tions of feature and configuration processing to visual body discrimination. Participants pre- dominantly gazed at the (body-centric) upper body for upright bodies and the lower body for inverted bodies in the context of an experimental paradigm directly comparable to that of prior studies of the BIE. Subsequent manipulation of fixation location indicates that these preferential gaze locations causally contributed to the BIE for whole bodies largely due to the informative nature of gazing at or near the head. Also, a BIE was detected for both whole and headless bodies even when fixation location on the body was held constant, indi- cating a role of configural processing in body discrimination, though inclusion of the head posture information was still highly discriminative in the context of such processing. Interest- ingly, the impact of configuration (upright and inverted) to the BIE appears greater than that of differential preferred gaze locations. |
Joseph Arizpe; Vincent Walsh; Galit Yovel; Chris I Baker The categories, frequencies, and stability of idiosyncratic eye-movement patterns to faces Journal Article Vision Research, 141 , pp. 191–203, 2017. Abstract | Links | BibTeX @article{Arizpe2017b,
title = {The categories, frequencies, and stability of idiosyncratic eye-movement patterns to faces},
author = {Joseph Arizpe and Vincent Walsh and Galit Yovel and Chris I Baker},
url = {http://dx.doi.org/10.1016/j.visres.2016.10.013},
doi = {10.1016/j.visres.2016.10.013},
year = {2017},
date = {2017-01-01},
journal = {Vision Research},
volume = {141},
pages = {191--203},
publisher = {Elsevier Ltd},
abstract = {The spatial pattern of eye-movements to faces considered typical for neurologically healthy individuals is a roughly T-shaped distribution over the internal facial features with peak fixation density tending toward the left eye (observer's perspective). However, recent studies indicate that striking deviations from this classic pattern are common within the population and are highly stable over time. The classic pattern actually reflects the average of these various idiosyncratic eye-movement patterns across individuals. The natural categories and respective frequencies of different types of idiosyncratic eye-movement patterns have not been specifically investigated before, so here we analyzed the spatial patterns of eye-movements for 48 participants to estimate the frequency of different kinds of individual eye-movement patterns to faces in the normal healthy population. Four natural clusters were discovered such that approximately 25% of our participants' fixation density peaks clustered over the left eye region (observer's perspective), 23% over the right eye-region, 31% over the nasion/bridge region of the nose, and 20% over the region spanning the nose, philthrum, and upper lips. We did not find any relationship between particular idiosyncratic eye-movement patterns and recognition performance. Individuals' eye-movement patterns early in a trial were more stereotyped than later ones and idiosyncratic fixation patterns evolved with time into a trial. Finally, while face inversion strongly modulated eye-movement patterns, individual patterns did not become less distinct for inverted compared to upright faces. Group-averaged fixation patterns do not represent individual patterns well, so exploration of such individual patterns is of value for future studies of visual cognition.},
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The spatial pattern of eye-movements to faces considered typical for neurologically healthy individuals is a roughly T-shaped distribution over the internal facial features with peak fixation density tending toward the left eye (observer's perspective). However, recent studies indicate that striking deviations from this classic pattern are common within the population and are highly stable over time. The classic pattern actually reflects the average of these various idiosyncratic eye-movement patterns across individuals. The natural categories and respective frequencies of different types of idiosyncratic eye-movement patterns have not been specifically investigated before, so here we analyzed the spatial patterns of eye-movements for 48 participants to estimate the frequency of different kinds of individual eye-movement patterns to faces in the normal healthy population. Four natural clusters were discovered such that approximately 25% of our participants' fixation density peaks clustered over the left eye region (observer's perspective), 23% over the right eye-region, 31% over the nasion/bridge region of the nose, and 20% over the region spanning the nose, philthrum, and upper lips. We did not find any relationship between particular idiosyncratic eye-movement patterns and recognition performance. Individuals' eye-movement patterns early in a trial were more stereotyped than later ones and idiosyncratic fixation patterns evolved with time into a trial. Finally, while face inversion strongly modulated eye-movement patterns, individual patterns did not become less distinct for inverted compared to upright faces. Group-averaged fixation patterns do not represent individual patterns well, so exploration of such individual patterns is of value for future studies of visual cognition. |
I T Armstrong; Douglas P Munoz Inhibitory control of eye movements during oculomotor countermanding in adults with attention-deficit hyperactivity disorder Journal Article Experimental Brain Research, 152 (4), pp. 444–452, 2003. Abstract | Links | BibTeX @article{Armstrong2003,
title = {Inhibitory control of eye movements during oculomotor countermanding in adults with attention-deficit hyperactivity disorder},
author = {I T Armstrong and Douglas P Munoz},
doi = {10.1007/s00221-003-1569-3},
year = {2003},
date = {2003-01-01},
journal = {Experimental Brain Research},
volume = {152},
number = {4},
pages = {444--452},
abstract = {Children with attention-deficit hyperactivity disorder (ADHD) are impulsive, and that impulsiveness can be measured using a countermanding task. Although the overt behaviors of ADHD attenuate with age, it is not clear how well impulsiveness is controlled in adults with ADHD. We tested ADHD adults with an oculomotor countermanding task. The task included two conditions: on 75% of the trials, participants viewed a central fixation marker and then looked to an eccentric target that appeared simultaneous with the disappearance of the fixation marker; on 25% of the trials, a signal was presented at variable delays after target appearance. The signal instructed subjects to stop, or countermand, an eye movement to the target. A correct movement in this case would be to hold gaze at the central fixation location. We expected ADHD participants to be impulsive in their countermanding performance. Additionally, we expected that a visual stop signal at the central fixation location would assist oculomotor countermanding because the signal is presented in the "stop" location, at fixation. To test whether a central stop signal positively biased countermanding, we used a three types of stop signal to instruct the stop: a central visual marker, a peripheral visual signal, and a non-localized sound. All subjects performed best with the central visual stop signal. Subjects with ADHD were less able to countermand eye movements and were influenced more negatively by the non-central signals. Oculomotor countermanding may be useful for quantifying impulsive dysfunction in adults with ADHD especially if a non-central stop signal is applied.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Children with attention-deficit hyperactivity disorder (ADHD) are impulsive, and that impulsiveness can be measured using a countermanding task. Although the overt behaviors of ADHD attenuate with age, it is not clear how well impulsiveness is controlled in adults with ADHD. We tested ADHD adults with an oculomotor countermanding task. The task included two conditions: on 75% of the trials, participants viewed a central fixation marker and then looked to an eccentric target that appeared simultaneous with the disappearance of the fixation marker; on 25% of the trials, a signal was presented at variable delays after target appearance. The signal instructed subjects to stop, or countermand, an eye movement to the target. A correct movement in this case would be to hold gaze at the central fixation location. We expected ADHD participants to be impulsive in their countermanding performance. Additionally, we expected that a visual stop signal at the central fixation location would assist oculomotor countermanding because the signal is presented in the "stop" location, at fixation. To test whether a central stop signal positively biased countermanding, we used a three types of stop signal to instruct the stop: a central visual marker, a peripheral visual signal, and a non-localized sound. All subjects performed best with the central visual stop signal. Subjects with ADHD were less able to countermand eye movements and were influenced more negatively by the non-central signals. Oculomotor countermanding may be useful for quantifying impulsive dysfunction in adults with ADHD especially if a non-central stop signal is applied. |
Nathan Arnett; Matthew Wagers Subject encodings and retrieval interference Journal Article Journal of Memory and Language, 93 , pp. 22–54, 2017. Abstract | Links | BibTeX @article{Arnett2017,
title = {Subject encodings and retrieval interference},
author = {Nathan Arnett and Matthew Wagers},
url = {http://dx.doi.org/10.1016/j.jml.2016.07.005},
doi = {10.1016/j.jml.2016.07.005},
year = {2017},
date = {2017-01-01},
journal = {Journal of Memory and Language},
volume = {93},
pages = {22--54},
abstract = {Interference has been identified as a cause of processing difficulty in linguistic dependencies, such as the subject-verb relation (Van Dyke and Lewis, 2003). However, while mounting evidence implicates retrieval interference in sentence processing, the nature of the retrieval cues involved - and thus the source of difficulty - remains largely unexplored. Three experiments used self-paced reading and eyetracking to examine the ways in which the retrieval cues provided at a verb characterize subjects. Syntactic theory has identified a number of properties correlated with subjecthood, both phrase-structural and thematic. Findings replicate and extend previous findings of interference at a verb from additional subjects, but indicate that retrieval outcomes are relativized to the syntactic domain in which the retrieval occurs. One, the cues distinguish between thematic subjects in verbal and nominal domains. Two, within the verbal domain, retrieval is sensitive to abstract syntactic properties associated with subjects and their clauses. We argue that the processing at a verb requires cue-driven retrieval, and that the retrieval cues utilize abstract grammatical properties which may reflect parser expectations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Interference has been identified as a cause of processing difficulty in linguistic dependencies, such as the subject-verb relation (Van Dyke and Lewis, 2003). However, while mounting evidence implicates retrieval interference in sentence processing, the nature of the retrieval cues involved - and thus the source of difficulty - remains largely unexplored. Three experiments used self-paced reading and eyetracking to examine the ways in which the retrieval cues provided at a verb characterize subjects. Syntactic theory has identified a number of properties correlated with subjecthood, both phrase-structural and thematic. Findings replicate and extend previous findings of interference at a verb from additional subjects, but indicate that retrieval outcomes are relativized to the syntactic domain in which the retrieval occurs. One, the cues distinguish between thematic subjects in verbal and nominal domains. Two, within the verbal domain, retrieval is sensitive to abstract syntactic properties associated with subjects and their clauses. We argue that the processing at a verb requires cue-driven retrieval, and that the retrieval cues utilize abstract grammatical properties which may reflect parser expectations. |
Jennifer E Arnold; Shin Yi C Lao Effects of psychological attention on pronoun comprehension Journal Article Language, Cognition and Neuroscience, 30 (7), pp. 832–852, 2015. Abstract | Links | BibTeX @article{Arnold2015a,
title = {Effects of psychological attention on pronoun comprehension},
author = {Jennifer E Arnold and Shin Yi C Lao},
url = {http://dx.doi.org/10.1080/23273798.2015.1017511},
doi = {10.1080/23273798.2015.1017511},
year = {2015},
date = {2015-01-01},
journal = {Language, Cognition and Neuroscience},
volume = {30},
number = {7},
pages = {832--852},
publisher = {Taylor & Francis},
abstract = {Pronoun comprehension is facilitated for referents that are focused in the discourse context. Discourse focus has been described as a function of attention, especially shared attention, but few studies have explicitly tested this idea. Two experiments used an exogenous capture cue paradigm to demonstrate that listeners' visual attention at the onset of a story influences their preferences during pronoun resolution later in the story. In both experiments trial-initial attention modulated listeners' transitory biases while considering referents for the pronoun, whether it was in response to the capture cue or not. These biases even had a small influence on listeners' final interpretation of the pronoun. These results provide independently motivated evidence that the listener's attention influences the online processes of pronoun comprehension. Trial-initial attentional shifts were made on the basis of non-shared, private information, demonstrating that attentional effects on pronoun comprehension are not restricted to shared attention among interlocutors.},
keywords = {},
pubstate = {published},
tppubtype = {article}
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Pronoun comprehension is facilitated for referents that are focused in the discourse context. Discourse focus has been described as a function of attention, especially shared attention, but few studies have explicitly tested this idea. Two experiments used an exogenous capture cue paradigm to demonstrate that listeners' visual attention at the onset of a story influences their preferences during pronoun resolution later in the story. In both experiments trial-initial attention modulated listeners' transitory biases while considering referents for the pronoun, whether it was in response to the capture cue or not. These biases even had a small influence on listeners' final interpretation of the pronoun. These results provide independently motivated evidence that the listener's attention influences the online processes of pronoun comprehension. Trial-initial attentional shifts were made on the basis of non-shared, private information, demonstrating that attentional effects on pronoun comprehension are not restricted to shared attention among interlocutors. |
David M Arnoldussen; Jeroen Goossens; Albert V van Den Berg Dissociation of retinal and headcentric disparity signals in dorsal human cortex Journal Article Frontiers in Systems Neuroscience, 9 , pp. 1–18, 2015. Abstract | Links | BibTeX @article{Arnoldussen2015,
title = {Dissociation of retinal and headcentric disparity signals in dorsal human cortex},
author = {David M Arnoldussen and Jeroen Goossens and Albert V {van Den Berg}},
url = {http://journal.frontiersin.org/Article/10.3389/fnsys.2015.00016/abstract},
doi = {10.3389/fnsys.2015.00016},
year = {2015},
date = {2015-01-01},
journal = {Frontiers in Systems Neuroscience},
volume = {9},
pages = {1--18},
abstract = {Recent fMRI studies have shown fusion of visual motion and disparity signals for shape perception (Ban et al., 2012), and unmasking camouflaged surfaces (Rokers et al., 2009), but no such interaction is known for typical dorsal motion pathway tasks, like grasping and navigation. Here, we investigate human speed perception of forward motion and its representation in the human motion network. We observe strong interaction in medial (V3ab, V6) and lateral motion areas (MT(+)), which differ significantly. Whereas the retinal disparity dominates the binocular contribution to the BOLD activity in the anterior part of area MT(+), headcentric disparity modulation of the BOLD response dominates in area V3ab and V6. This suggests that medial motion areas not only represent rotational speed of the head (Arnoldussen et al., 2011), but also translational speed of the head relative to the scene. Interestingly, a strong response to vergence eye movements was found in area V1, which showed a dependency on visual direction, just like vertical-size disparity. This is the first report of a vertical-size disparity correlate in human striate cortex.},
keywords = {},
pubstate = {published},
tppubtype = {article}
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Recent fMRI studies have shown fusion of visual motion and disparity signals for shape perception (Ban et al., 2012), and unmasking camouflaged surfaces (Rokers et al., 2009), but no such interaction is known for typical dorsal motion pathway tasks, like grasping and navigation. Here, we investigate human speed perception of forward motion and its representation in the human motion network. We observe strong interaction in medial (V3ab, V6) and lateral motion areas (MT(+)), which differ significantly. Whereas the retinal disparity dominates the binocular contribution to the BOLD activity in the anterior part of area MT(+), headcentric disparity modulation of the BOLD response dominates in area V3ab and V6. This suggests that medial motion areas not only represent rotational speed of the head (Arnoldussen et al., 2011), but also translational speed of the head relative to the scene. Interestingly, a strong response to vergence eye movements was found in area V1, which showed a dependency on visual direction, just like vertical-size disparity. This is the first report of a vertical-size disparity correlate in human striate cortex. |
Árni Gunnar Ásgeirsson; Árni Kristjánsson; Claus Bundesen Repetition priming in selective attention: A TVA analysis Journal Article Acta Psychologica, 160 (35-42), pp. 35–42, 2015. Abstract | Links | BibTeX @article{Asgeirsson2015,
title = {Repetition priming in selective attention: A TVA analysis},
author = {Árni Gunnar Ásgeirsson and Árni Kristjánsson and Claus Bundesen},
doi = {10.1016/j.actpsy.2015.06.008},
year = {2015},
date = {2015-01-01},
journal = {Acta Psychologica},
volume = {160},
number = {35-42},
pages = {35--42},
abstract = {Current behavior is influenced by events in the recent past. In visual attention, this is expressed in many variations of priming effects. Here, we investigate color priming in a brief exposure digit-recognition task. Observers performed a masked odd-one-out singleton recognition task where the target-color either repeated or changed between subsequent trials. Performance was measured by recognition accuracy over exposure durations. The purpose of the study was to replicate earlier findings of perceptual priming in brief displays and to model those results based on a Theory of Visual Attention (TVA; Bundesen, 1990). We tested 4 different definitions of a generic TVA-model and assessed their explanatory power. Our hypothesis was that priming effects could be explained by selective mechanisms, and that target-color repetitions would only affect the selectivity parameter ($alpha$) of our models. Repeating target colors enhanced performance for all 12 observers. As predicted, this was only true under conditions that required selection of a target among distractors, but not when a target was presented alone. Model fits by TVA were obtained with a trial-by-trial maximum likelihood estimation procedure that estimated 4-15 free parameters, depending on the particular model. We draw two main conclusions. Color priming can be modeled simply as a change in selectivity between conditions of repetition or swap of target color. Depending on the desired resolution of analysis; priming can accurately be modeled by a simple four parameter model, where VSTM capacity and spatial biases of attention are ignored, or more fine-grained by a 10 parameter model that takes these aspects into account.},
keywords = {},
pubstate = {published},
tppubtype = {article}
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Current behavior is influenced by events in the recent past. In visual attention, this is expressed in many variations of priming effects. Here, we investigate color priming in a brief exposure digit-recognition task. Observers performed a masked odd-one-out singleton recognition task where the target-color either repeated or changed between subsequent trials. Performance was measured by recognition accuracy over exposure durations. The purpose of the study was to replicate earlier findings of perceptual priming in brief displays and to model those results based on a Theory of Visual Attention (TVA; Bundesen, 1990). We tested 4 different definitions of a generic TVA-model and assessed their explanatory power. Our hypothesis was that priming effects could be explained by selective mechanisms, and that target-color repetitions would only affect the selectivity parameter ($alpha$) of our models. Repeating target colors enhanced performance for all 12 observers. As predicted, this was only true under conditions that required selection of a target among distractors, but not when a target was presented alone. Model fits by TVA were obtained with a trial-by-trial maximum likelihood estimation procedure that estimated 4-15 free parameters, depending on the particular model. We draw two main conclusions. Color priming can be modeled simply as a change in selectivity between conditions of repetition or swap of target color. Depending on the desired resolution of analysis; priming can accurately be modeled by a simple four parameter model, where VSTM capacity and spatial biases of attention are ignored, or more fine-grained by a 10 parameter model that takes these aspects into account. |
Árni Gunnar Ásgeirsson; Sander Nieuwenhuis No arousal-biased competition in focused visuospatial attention Journal Article Cognition, 168 , pp. 191–204, 2017. Abstract | Links | BibTeX @article{Asgeirsson2017,
title = {No arousal-biased competition in focused visuospatial attention},
author = {Árni Gunnar Ásgeirsson and Sander Nieuwenhuis},
doi = {10.1016/j.cognition.2017.07.001},
year = {2017},
date = {2017-01-01},
journal = {Cognition},
volume = {168},
pages = {191--204},
abstract = {Arousal sometimes enhances and sometimes impairs perception and memory. A recent theory attempts to reconcile these findings by proposing that arousal amplifies the competition between stimulus representations, strengthening already strong representations and weakening already weak representations. Here, we report a stringent test of this arousal-biased competition theory in the context of focused visuospatial attention. Participants were required to identify a briefly presented target in the context of multiple distractors, which varied in the degree to which they competed for representation with the target, as revealed by psychophysics. We manipulated arousal using emotionally arousing pictures (Experiment 1), alerting tones (Experiment 2) and white-noise stimulation (Experiment 3), and validated these manipulations with electroencephalography and pupillometry. In none of the experiments did we find evidence that arousal modulated the effect of distractor competition on the accuracy of target identification. Bayesian statistics revealed moderate to strong evidence against arousal-biased competition. Modeling of the psychophysical data based on Bundesen's (1990) theory of visual attention corroborated the conclusion that arousal does not bias competition in focused visuospatial attention.},
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pubstate = {published},
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Arousal sometimes enhances and sometimes impairs perception and memory. A recent theory attempts to reconcile these findings by proposing that arousal amplifies the competition between stimulus representations, strengthening already strong representations and weakening already weak representations. Here, we report a stringent test of this arousal-biased competition theory in the context of focused visuospatial attention. Participants were required to identify a briefly presented target in the context of multiple distractors, which varied in the degree to which they competed for representation with the target, as revealed by psychophysics. We manipulated arousal using emotionally arousing pictures (Experiment 1), alerting tones (Experiment 2) and white-noise stimulation (Experiment 3), and validated these manipulations with electroencephalography and pupillometry. In none of the experiments did we find evidence that arousal modulated the effect of distractor competition on the accuracy of target identification. Bayesian statistics revealed moderate to strong evidence against arousal-biased competition. Modeling of the psychophysical data based on Bundesen's (1990) theory of visual attention corroborated the conclusion that arousal does not bias competition in focused visuospatial attention. |
Mania Asgharpour; Mehdi Tehrani-Doost; Mehrnoosh Ahmadi; Hamid Moshki Visual attention to emotional face in schizophrenia: An eye tracking study Journal Article Iranian Journal of Psychiatry, 10 (1), pp. 13–18, 2015. Abstract | Links | BibTeX @article{Asgharpour2015,
title = {Visual attention to emotional face in schizophrenia: An eye tracking study},
author = {Mania Asgharpour and Mehdi Tehrani-Doost and Mehrnoosh Ahmadi and Hamid Moshki},
doi = {10.1186/1471-2180-9-74r1471-2180-9-74 [pii]},
year = {2015},
date = {2015-01-01},
journal = {Iranian Journal of Psychiatry},
volume = {10},
number = {1},
pages = {13--18},
abstract = {OBJECTIVE: Deficits in the processing of facial emotions have been reported extensively in patients with schizophrenia. To explore whether restricted attention is the cause of impaired emotion processing in these patients, we examined visual attention through tracking eye movements in response to emotional and neutral face stimuli in a group of patients with schizophrenia and healthy individuals. We also examined the correlation between visual attention allocation and symptoms severity in our patient group. METHOD: Thirty adult patients with schizophrenia and 30 matched healthy controls participated in this study. Visual attention data were recorded while participants passively viewed emotional-neutral face pairs for 500 ms. The relationship between the visual attention and symptoms severity were assessed by the Positive and Negative Syndrome Scale (PANSS) in the schizophrenia group. Repeated Measures ANOVAs were used to compare the groups. RESULTS: Comparing the number of fixations made during face-pairs presentation, we found that patients with schizophrenia made fewer fixations on faces, regardless of the expression of the face. Analysis of the number of fixations on negative-neutral pairs also revealed that the patients made fewer fixations on both neutral and negative faces. Analysis of number of fixations on positive-neutral pairs only showed more fixations on positive relative to neutral expressions in both groups. We found no correlations between visual attention pattern to faces and symptom severity in schizophrenic patients. CONCLUSION: The results of this study suggest that the facial recognition deficit in schizophrenia is related to decreased attention to face stimuli. Finding of no difference in visual attention for positive-neutral face pairs between the groups is in line with studies that have shown increased ability to positive emotional perception in these patients.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
OBJECTIVE: Deficits in the processing of facial emotions have been reported extensively in patients with schizophrenia. To explore whether restricted attention is the cause of impaired emotion processing in these patients, we examined visual attention through tracking eye movements in response to emotional and neutral face stimuli in a group of patients with schizophrenia and healthy individuals. We also examined the correlation between visual attention allocation and symptoms severity in our patient group. METHOD: Thirty adult patients with schizophrenia and 30 matched healthy controls participated in this study. Visual attention data were recorded while participants passively viewed emotional-neutral face pairs for 500 ms. The relationship between the visual attention and symptoms severity were assessed by the Positive and Negative Syndrome Scale (PANSS) in the schizophrenia group. Repeated Measures ANOVAs were used to compare the groups. RESULTS: Comparing the number of fixations made during face-pairs presentation, we found that patients with schizophrenia made fewer fixations on faces, regardless of the expression of the face. Analysis of the number of fixations on negative-neutral pairs also revealed that the patients made fewer fixations on both neutral and negative faces. Analysis of number of fixations on positive-neutral pairs only showed more fixations on positive relative to neutral expressions in both groups. We found no correlations between visual attention pattern to faces and symptom severity in schizophrenic patients. CONCLUSION: The results of this study suggest that the facial recognition deficit in schizophrenia is related to decreased attention to face stimuli. Finding of no difference in visual attention for positive-neutral face pairs between the groups is in line with studies that have shown increased ability to positive emotional perception in these patients. |
Matthew F Asher; David J Tolhurst; Tom Troscianko; Iain D Gilchrist Regional effects of clutter on human target detection performance Journal Article Journal of Vision, 13 (5), pp. 1–15, 2013. Abstract | Links | BibTeX @article{Asher2013,
title = {Regional effects of clutter on human target detection performance},
author = {Matthew F Asher and David J Tolhurst and Tom Troscianko and Iain D Gilchrist},
url = {http://jov.arvojournals.org/Article.aspx?doi=10.1167/13.5.25},
doi = {10.1167/13.5.25},
year = {2013},
date = {2013-01-01},
journal = {Journal of Vision},
volume = {13},
number = {5},
pages = {1--15},
abstract = {Clutter is something that is encountered in everyday life, from a messy desk to a crowded street. Such clutter may interfere with our ability to search for objects in such environments, like our car keys or the person we are trying to meet. A number of computational models of clutter have been proposed and shown to work well for artificial and other simplified scene search tasks. In this paper, we correlate the performance of different models of visual clutter to human performance in a visual search task using natural scenes. The models we evaluate are Feature Congestion (Rosenholtz, Li, & Nakano, 2007), Sub-band Entropy (Rosenholtz et al., 2007), Segmentation (Bravo & Farid, 2008), and Edge Density (Mack & Oliva, 2004) measures. The correlations were performed across a range of target-centered subregions to produce a correlation profile, indicating the scale at which clutter was affecting search performance. Overall clutter was rather weakly correlated with performance (r ≈ 0.2). However, different measures of clutter appear to reflect different aspects of the search task: correlations with Feature Congestion are greatest for the actual target patch, whereas the Sub-band Entropy is most highly correlated in a region 12° × 12° centered on the target.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Clutter is something that is encountered in everyday life, from a messy desk to a crowded street. Such clutter may interfere with our ability to search for objects in such environments, like our car keys or the person we are trying to meet. A number of computational models of clutter have been proposed and shown to work well for artificial and other simplified scene search tasks. In this paper, we correlate the performance of different models of visual clutter to human performance in a visual search task using natural scenes. The models we evaluate are Feature Congestion (Rosenholtz, Li, & Nakano, 2007), Sub-band Entropy (Rosenholtz et al., 2007), Segmentation (Bravo & Farid, 2008), and Edge Density (Mack & Oliva, 2004) measures. The correlations were performed across a range of target-centered subregions to produce a correlation profile, indicating the scale at which clutter was affecting search performance. Overall clutter was rather weakly correlated with performance (r ≈ 0.2). However, different measures of clutter appear to reflect different aspects of the search task: correlations with Feature Congestion are greatest for the actual target patch, whereas the Sub-band Entropy is most highly correlated in a region 12° × 12° centered on the target. |
Hiroshi Ashida; Ichiro Kuriki; Ikuya Murakami; Rumi Hisakata; Akiyoshi Kitaoka Direction-specific fMRI adaptation reveals the visual cortical network underlying the "Rotating Snakes" illusion Journal Article NeuroImage, 61 (4), pp. 1143–1152, 2012. Abstract | Links | BibTeX @article{Ashida2012,
title = {Direction-specific fMRI adaptation reveals the visual cortical network underlying the "Rotating Snakes" illusion},
author = {Hiroshi Ashida and Ichiro Kuriki and Ikuya Murakami and Rumi Hisakata and Akiyoshi Kitaoka},
url = {http://dx.doi.org/10.1016/j.neuroimage.2012.03.033},
doi = {10.1016/j.neuroimage.2012.03.033},
year = {2012},
date = {2012-01-01},
journal = {NeuroImage},
volume = {61},
number = {4},
pages = {1143--1152},
publisher = {Elsevier Inc.},
abstract = {The "Rotating Snakes" figure elicits a clear sense of anomalous motion in stationary repetitive patterns. We used an event-related fMRI adaptation paradigm to investigate cortical mechanisms underlying the illusory motion. Following an adapting stimulus (S1) and a blank period, a probe stimulus (S2) that elicited illusory motion either in the same or in the opposite direction was presented. Attention was controlled by a fixation task, and control experiments precluded explanations in terms of artefacts of local adaptation, afterimages, or involuntary eye movements. Recorded BOLD responses were smaller for S2 in the same direction than S2 in the opposite direction in V1-V4, V3A, and MT+, indicating direction-selective adaptation. Adaptation in MT. + was correlated with adaptation in V1 but not in V4. With possible downstream inheritance of adaptation, it is most likely that adaptation predominantly occurred in V1. The results extend our previous findings of activation in MT. + (I. Kuriki, H. Ashida, I. Murakami, and A. Kitaoka, 2008), revealing the activity of the cortical network for motion processing from V1 towards MT+. This provides evidence for the role of front-end motion detectors, which has been assumed in proposed models of the illusion.},
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pubstate = {published},
tppubtype = {article}
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The "Rotating Snakes" figure elicits a clear sense of anomalous motion in stationary repetitive patterns. We used an event-related fMRI adaptation paradigm to investigate cortical mechanisms underlying the illusory motion. Following an adapting stimulus (S1) and a blank period, a probe stimulus (S2) that elicited illusory motion either in the same or in the opposite direction was presented. Attention was controlled by a fixation task, and control experiments precluded explanations in terms of artefacts of local adaptation, afterimages, or involuntary eye movements. Recorded BOLD responses were smaller for S2 in the same direction than S2 in the opposite direction in V1-V4, V3A, and MT+, indicating direction-selective adaptation. Adaptation in MT. + was correlated with adaptation in V1 but not in V4. With possible downstream inheritance of adaptation, it is most likely that adaptation predominantly occurred in V1. The results extend our previous findings of activation in MT. + (I. Kuriki, H. Ashida, I. Murakami, and A. Kitaoka, 2008), revealing the activity of the cortical network for motion processing from V1 towards MT+. This provides evidence for the role of front-end motion detectors, which has been assumed in proposed models of the illusion. |
Natsuki Atagi; Melissa DeWolf; James W Stigler; Scott P Johnson The role of visual representations in college students' understanding of mathematical notation Journal Article Journal of Experimental Psychology: Applied, 22 (3), pp. 295–304, 2016. Abstract | Links | BibTeX @article{Atagi2016,
title = {The role of visual representations in college students' understanding of mathematical notation},
author = {Natsuki Atagi and Melissa DeWolf and James W Stigler and Scott P Johnson},
doi = {10.1037/xap0000090},
year = {2016},
date = {2016-01-01},
journal = {Journal of Experimental Psychology: Applied},
volume = {22},
number = {3},
pages = {295--304},
abstract = {Developing understanding of fractions involves connections between nonsymbolic visual representations and symbolic representations. Initially, teachers introduce fraction concepts with visual representations before moving to symbolic representations. Once the focus is shifted to symbolic representations, the connections between visual representations and symbolic notation are considered to be less useful, and students are rarely asked to connect symbolic notation back to visual representations. In 2 experiments, we ask whether visual representations affect understanding of symbolic notation for adults who understand symbolic notation. In a conceptual fraction comparison task (e.g., Which is larger, 5 / a or 8 / a?), participants were given comparisons paired with accurate, helpful visual representations, misleading visual representations, or no visual representations. The results show that even college students perform significantly better when accurate visuals are provided over misleading or no visuals. Further, eye-tracking data suggest that these visual representations may affect performance even when only briefly looked at. Implications for theories of fraction understanding and education are discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Developing understanding of fractions involves connections between nonsymbolic visual representations and symbolic representations. Initially, teachers introduce fraction concepts with visual representations before moving to symbolic representations. Once the focus is shifted to symbolic representations, the connections between visual representations and symbolic notation are considered to be less useful, and students are rarely asked to connect symbolic notation back to visual representations. In 2 experiments, we ask whether visual representations affect understanding of symbolic notation for adults who understand symbolic notation. In a conceptual fraction comparison task (e.g., Which is larger, 5 / a or 8 / a?), participants were given comparisons paired with accurate, helpful visual representations, misleading visual representations, or no visual representations. The results show that even college students perform significantly better when accurate visuals are provided over misleading or no visuals. Further, eye-tracking data suggest that these visual representations may affect performance even when only briefly looked at. Implications for theories of fraction understanding and education are discussed. |
Anne Atas; Nathan Faivre; Bert Timmermans; Axel Cleeremans; Sid Kouider Nonconscious learning from crowded sequences Journal Article Psychological Science, 25 (1), pp. 113–119, 2014. Abstract | Links | BibTeX @article{Atas2014,
title = {Nonconscious learning from crowded sequences},
author = {Anne Atas and Nathan Faivre and Bert Timmermans and Axel Cleeremans and Sid Kouider},
doi = {10.1177/0956797613499591},
year = {2014},
date = {2014-01-01},
journal = {Psychological Science},
volume = {25},
number = {1},
pages = {113--119},
abstract = {Can people learn complex information without conscious awareness? Implicit learning-learning without awareness of what has been learned-has been the focus of intense investigation over the last 50 years. However, it remains controversial whether complex knowledge can be learned implicitly. In the research reported here, we addressed this challenge by asking participants to differentiate between sequences of symbols they could not perceive consciously. Using an operant-conditioning task, we showed that participants learned to associate distinct sequences of crowded (nondiscriminable) symbols with their respective monetary outcomes (reward or punishment). Overall, our study demonstrates that sensitivity to sequential regularities can arise through the nonconscious temporal integration of perceptual information.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Can people learn complex information without conscious awareness? Implicit learning-learning without awareness of what has been learned-has been the focus of intense investigation over the last 50 years. However, it remains controversial whether complex knowledge can be learned implicitly. In the research reported here, we addressed this challenge by asking participants to differentiate between sequences of symbols they could not perceive consciously. Using an operant-conditioning task, we showed that participants learned to associate distinct sequences of crowded (nondiscriminable) symbols with their respective monetary outcomes (reward or punishment). Overall, our study demonstrates that sensitivity to sequential regularities can arise through the nonconscious temporal integration of perceptual information. |
Nada Attar; Matthew H Schneps; Marc Pomplun Working memory load predicts visual search efficiency: Evidence from a novel pupillary response paradigm Journal Article Memory and Cognition, 44 (7), pp. 1038–1049, 2016. Abstract | Links | BibTeX @article{Attar2016,
title = {Working memory load predicts visual search efficiency: Evidence from a novel pupillary response paradigm},
author = {Nada Attar and Matthew H Schneps and Marc Pomplun},
url = {http://dx.doi.org/10.3758/s13421-016-0617-8},
doi = {10.3758/s13421-016-0617-8},
year = {2016},
date = {2016-01-01},
journal = {Memory and Cognition},
volume = {44},
number = {7},
pages = {1038--1049},
publisher = {Memory & Cognition},
abstract = {An observer's pupil dilates and constricts in response to variables such as ambient and focal luminance, cognitive effort, the emotional stimulus content, and working memory load. The pupil's memory load response is of particular interest, as it might be used for estimating observers' memory load while they are performing a complex task, without adding an interruptive and confounding memory test to the protocol. One important task in which working memory's involvement is still being debated is visual search, and indeed a previous experiment by Porter, Troscianko, and Gilchrist (Quarterly Journal of Experimental Psychology, 60, 211-229, 2007) analyzed observers' pupil sizes during search to study this issue. These authors found that pupil size increased over the course of the search, and they attributed this finding to accumulating working memory load. However, since the pupil response is slow and does not depend on memory load alone, this conclusion is rather speculative. In the present study, we estimated working memory load in visual search during the presentation of intermittent fixation screens, thought to induce a low, stable level of arousal and cognitive effort. Using standard visual search and control tasks, we showed that this paradigm reduces the influence of non-memory-related factors on pupil size. Furthermore, we found an early increase in working memory load to be associated with more efficient search, indicating a significant role of working memory in the search process.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
An observer's pupil dilates and constricts in response to variables such as ambient and focal luminance, cognitive effort, the emotional stimulus content, and working memory load. The pupil's memory load response is of particular interest, as it might be used for estimating observers' memory load while they are performing a complex task, without adding an interruptive and confounding memory test to the protocol. One important task in which working memory's involvement is still being debated is visual search, and indeed a previous experiment by Porter, Troscianko, and Gilchrist (Quarterly Journal of Experimental Psychology, 60, 211-229, 2007) analyzed observers' pupil sizes during search to study this issue. These authors found that pupil size increased over the course of the search, and they attributed this finding to accumulating working memory load. However, since the pupil response is slow and does not depend on memory load alone, this conclusion is rather speculative. In the present study, we estimated working memory load in visual search during the presentation of intermittent fixation screens, thought to induce a low, stable level of arousal and cognitive effort. Using standard visual search and control tasks, we showed that this paradigm reduces the influence of non-memory-related factors on pupil size. Furthermore, we found an early increase in working memory load to be associated with more efficient search, indicating a significant role of working memory in the search process. |
Janice Attard-Johnson; Markus Bindemann; Caoilte Ó Ciardha Pupillary response as an age-specific measure of sexual interest Journal Article Archives of Sexual Behavior, 45 (4), pp. 855–870, 2016. Abstract | Links | BibTeX @article{Attard-Johnson2016,
title = {Pupillary response as an age-specific measure of sexual interest},
author = {Janice Attard-Johnson and Markus Bindemann and Caoilte {Ó Ciardha}},
doi = {10.1007/s10508-015-0681-3},
year = {2016},
date = {2016-01-01},
journal = {Archives of Sexual Behavior},
volume = {45},
number = {4},
pages = {855--870},
publisher = {Springer US},
abstract = {In the visual processing of sexual content, pupil dilation is an indicator of arousal that has been linked to observers' sexual orientation. This study investigated whether this measure can be extended to determine age-specific sexual interest. In two experiments, the pupillary responses of heterosexual adults to images of males and females of different ages were related to self-reported sexual interest, sexual appeal to the stimuli, and a child molestation proclivity scale. In both experiments, the pupils of male observers dilated to photographs ofwomen but not men, children, or neutral stimuli. These pupillary responses corresponded with observer's self-reported sexual interests and their sexual appeal ratings of the stimuli. Female observers showed pupil dilation to photographs of men and women but not children. In women,pupillary responses also correlated poorly with sexual appeal ratings ofthe stimuli. These experiments provide initial evidence that eye-tracking could be used as ameasure of sex-specific interest in male observers, and as an age-specific index in male and female observers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In the visual processing of sexual content, pupil dilation is an indicator of arousal that has been linked to observers' sexual orientation. This study investigated whether this measure can be extended to determine age-specific sexual interest. In two experiments, the pupillary responses of heterosexual adults to images of males and females of different ages were related to self-reported sexual interest, sexual appeal to the stimuli, and a child molestation proclivity scale. In both experiments, the pupils of male observers dilated to photographs ofwomen but not men, children, or neutral stimuli. These pupillary responses corresponded with observer's self-reported sexual interests and their sexual appeal ratings of the stimuli. Female observers showed pupil dilation to photographs of men and women but not children. In women,pupillary responses also correlated poorly with sexual appeal ratings ofthe stimuli. These experiments provide initial evidence that eye-tracking could be used as ameasure of sex-specific interest in male observers, and as an age-specific index in male and female observers. |
Janice Attard-Johnson; Markus Bindemann Sex-specific but not sexually explicit: Pupillary responses to dressed and naked adults Journal Article Royal Society Open Science, 4 (5), pp. 1–10, 2017. Abstract | Links | BibTeX @article{Attard-Johnson2017,
title = {Sex-specific but not sexually explicit: Pupillary responses to dressed and naked adults},
author = {Janice Attard-Johnson and Markus Bindemann},
doi = {10.1098/rsos.160963},
year = {2017},
date = {2017-01-01},
journal = {Royal Society Open Science},
volume = {4},
number = {5},
pages = {1--10},
abstract = {Dilation of the pupils is an indicator of an observer's sexual interest in other people, but it remains unresolved whether this response is strengthened or diminished by sexually explicit material. To address this question, this study compared pupillary responses of heterosexual men and women to naked and dressed portraits of male and female adult film actors. Pupillary responses corresponded with observers' self-reported sexual orientation, such that dilation occurred during the viewing of opposite-sex people, but were comparable for naked and dressed targets. These findings indicate that pupillary responses provide a sex-specific measure, but are not sensitive to sexually explicit content.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Dilation of the pupils is an indicator of an observer's sexual interest in other people, but it remains unresolved whether this response is strengthened or diminished by sexually explicit material. To address this question, this study compared pupillary responses of heterosexual men and women to naked and dressed portraits of male and female adult film actors. Pupillary responses corresponded with observers' self-reported sexual orientation, such that dilation occurred during the viewing of opposite-sex people, but were comparable for naked and dressed targets. These findings indicate that pupillary responses provide a sex-specific measure, but are not sensitive to sexually explicit content. |
Janice Attard-Johnson; Markus Bindemann; Caoilte Ó Ciardha Heterosexual, homosexual, and bisexual men's pupillary responses to persons at different stages of sexual development Journal Article Journal of Sex Research, 54 (9), pp. 1085–1096, 2017. Abstract | Links | BibTeX @article{Attard-Johnson2017a,
title = {Heterosexual, homosexual, and bisexual men's pupillary responses to persons at different stages of sexual development},
author = {Janice Attard-Johnson and Markus Bindemann and Caoilte {Ó Ciardha}},
url = {https://doi.org/10.1080/00224499.2016.1241857},
doi = {10.1080/00224499.2016.1241857},
year = {2017},
date = {2017-01-01},
journal = {Journal of Sex Research},
volume = {54},
number = {9},
pages = {1085--1096},
publisher = {Routledge},
abstract = {This study investigated whether pupil size during the viewing of images of adults and children reflects the sexual orientation of heterosexual, homosexual, and bisexual men (n = 100},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This study investigated whether pupil size during the viewing of images of adults and children reflects the sexual orientation of heterosexual, homosexual, and bisexual men (n = 100 |
Janice Attard; Markus Bindemann Establishing the duration of crimes: An individual differences and eye-tracking investigation into time estimation Journal Article Applied Cognitive Psychology, 28 (2), pp. 215–225, 2014. Abstract | Links | BibTeX @article{Attard2014,
title = {Establishing the duration of crimes: An individual differences and eye-tracking investigation into time estimation},
author = {Janice Attard and Markus Bindemann},
doi = {10.1002/acp.2986},
year = {2014},
date = {2014-01-01},
journal = {Applied Cognitive Psychology},
volume = {28},
number = {2},
pages = {215--225},
abstract = {The time available for viewing a perpetrator at a crime scene predicts successful person recognition in subsequent identity line-ups. This time is usually unknown and must be derived from eyewitnesses' duration estimates. This study therefore compared the estimates that different individuals provide for crimes. We then attempted to determine the accuracy of these durations by measuring observers' general time estimation ability with a set of estimator videos. Observers differed greatly in their ability to estimate time, but individual duration estimates correlated strongly for crime and estimator materials. This indicates that it might be possible to infer unknown durations of events, such as criminal incidents, from a person's ability to estimate known durations. We also measured observers' eye movements to a perpetrator during crimes. Only fixations on a perpetrator's face related to eyewitness accuracy, but these fixations did not correlate with exposure estimates for this person. The implications of these findings are discussed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The time available for viewing a perpetrator at a crime scene predicts successful person recognition in subsequent identity line-ups. This time is usually unknown and must be derived from eyewitnesses' duration estimates. This study therefore compared the estimates that different individuals provide for crimes. We then attempted to determine the accuracy of these durations by measuring observers' general time estimation ability with a set of estimator videos. Observers differed greatly in their ability to estimate time, but individual duration estimates correlated strongly for crime and estimator materials. This indicates that it might be possible to infer unknown durations of events, such as criminal incidents, from a person's ability to estimate known durations. We also measured observers' eye movements to a perpetrator during crimes. Only fixations on a perpetrator's face related to eyewitness accuracy, but these fixations did not correlate with exposure estimates for this person. The implications of these findings are discussed. |
Ricky K C Au; Fuminori Ono; Katsumi Watanabe Time dilation induced by object motion is based on spatiotopic but not retinotopic positions Journal Article Frontiers in Psychology, 3 , pp. 58, 2012. Abstract | Links | BibTeX @article{Au2012,
title = {Time dilation induced by object motion is based on spatiotopic but not retinotopic positions},
author = {Ricky K C Au and Fuminori Ono and Katsumi Watanabe},
doi = {10.3389/fpsyg.2012.00058},
year = {2012},
date = {2012-01-01},
journal = {Frontiers in Psychology},
volume = {3},
pages = {58},
abstract = {Time perception of visual events depends on the visual attributes of the scene. Previous studies reported that motion of object can induce an illusion of lengthened time. In the present study, we asked the question whether such time dilation effect depends on the actual physical motion of the object (spatiotopic coordinate), or its relative motion with respect to the retina (retinotopic coordinate). Observers were presented with a moving stimulus and a static reference stimulus in separate intervals, and judged which interval they perceived as having a longer duration, under conditions with eye fixation (Experiment 1) and with eye movement at same velocity as the moving stimulus (Experiment 2). The data indicated that the perceived duration was longer under object motion, and depended on the actual movement of the object rather than relative retinal motion. These results are in support with the notion that the brain possesses a spatiotopic representation regarding the real world positions of objects in which the perception of time is associated with.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Time perception of visual events depends on the visual attributes of the scene. Previous studies reported that motion of object can induce an illusion of lengthened time. In the present study, we asked the question whether such time dilation effect depends on the actual physical motion of the object (spatiotopic coordinate), or its relative motion with respect to the retina (retinotopic coordinate). Observers were presented with a moving stimulus and a static reference stimulus in separate intervals, and judged which interval they perceived as having a longer duration, under conditions with eye fixation (Experiment 1) and with eye movement at same velocity as the moving stimulus (Experiment 2). The data indicated that the perceived duration was longer under object motion, and depended on the actual movement of the object rather than relative retinal motion. These results are in support with the notion that the brain possesses a spatiotopic representation regarding the real world positions of objects in which the perception of time is associated with. |
Ryszard Auksztulewicz; Karl Friston Attentional enhancement of auditory mismatch responses: A DCM/MEG study Journal Article Cerebral Cortex, 25 (11), pp. 4273–4283, 2015. Abstract | Links | BibTeX @article{Auksztulewicz2015,
title = {Attentional enhancement of auditory mismatch responses: A DCM/MEG study},
author = {Ryszard Auksztulewicz and Karl Friston},
doi = {10.1093/cercor/bhu323},
year = {2015},
date = {2015-01-01},
journal = {Cerebral Cortex},
volume = {25},
number = {11},
pages = {4273--4283},
abstract = {Despite similar behavioral effects, attention and expectation influence evoked responses differently: Attention typically enhances event-related responses, whereas expectation reduces them. This dissociation has been reconciled under predictive coding, where prediction errors are weighted by precision associated with attentional modulation. Here, we tested the predictive coding account of attention and expectation using magnetoencephalography and modeling. Temporal attention and sensory expectation were orthogonally manipulated in an auditory mismatch paradigm, revealing opposing effects on evoked response amplitude. Mismatch negativity (MMN) was enhanced by attention, speaking against its supposedly pre-attentive nature. This interaction effect was modeled in a canonical microcircuit using dynamic causal modeling, comparing models with modulation of extrinsic and intrinsic connectivity at different levels of the auditory hierarchy. While MMN was explained by recursive interplay of sensory predictions and prediction errors, attention was linked to the gain of inhibitory interneurons, consistent with its modulation of sensory precision.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Despite similar behavioral effects, attention and expectation influence evoked responses differently: Attention typically enhances event-related responses, whereas expectation reduces them. This dissociation has been reconciled under predictive coding, where prediction errors are weighted by precision associated with attentional modulation. Here, we tested the predictive coding account of attention and expectation using magnetoencephalography and modeling. Temporal attention and sensory expectation were orthogonally manipulated in an auditory mismatch paradigm, revealing opposing effects on evoked response amplitude. Mismatch negativity (MMN) was enhanced by attention, speaking against its supposedly pre-attentive nature. This interaction effect was modeled in a canonical microcircuit using dynamic causal modeling, comparing models with modulation of extrinsic and intrinsic connectivity at different levels of the auditory hierarchy. While MMN was explained by recursive interplay of sensory predictions and prediction errors, attention was linked to the gain of inhibitory interneurons, consistent with its modulation of sensory precision. |
A J Austin; T Duka Mechanisms of attention for appetitive and aversive outcomes in Pavlovian conditioning Journal Article Behavioural Brain Research, 213 (1), pp. 19–26, 2010. Abstract | Links | BibTeX @article{Austin2010,
title = {Mechanisms of attention for appetitive and aversive outcomes in Pavlovian conditioning},
author = {A J Austin and T Duka},
url = {http://dx.doi.org/10.1016/j.bbr.2010.04.019},
doi = {10.1016/j.bbr.2010.04.019},
year = {2010},
date = {2010-01-01},
journal = {Behavioural Brain Research},
volume = {213},
number = {1},
pages = {19--26},
publisher = {Elsevier B.V.},
abstract = {Different mechanisms of attention controlling learning have been proposed in appetitive and aversive conditioning. The aim of the present study was to compare attention and learning in a Pavlovian conditioning paradigm using visual stimuli of varying predictive value of either monetary reward (appetitive conditioning; 10p or 50p) or blast of white noise (aversive conditioning; 97 dB or 102 dB). Outcome values were matched across the two conditions with regard to their emotional significance. Sixty-four participants were allocated to one of the four conditions matched for age and gender. All participants underwent a discriminative learning task using pairs of visual stimuli that signalled a 100%, 50%, or 0% probability of receiving an outcome. Learning was measured using a 9-point Likert scale of expectancy of the outcome, while attention using an eyetracker device. Arousal and emotional conditioning were also evaluated. Dwell time was greatest for the full predictor in the noise groups, while in the money groups attention was greatest for the partial predictor over the other two predictors. The progression of learning was the same for both groups. These findings suggest that in aversive conditioning attention is driven by the predictive salience of the stimulus while in appetitive conditioning attention is error-driven, when emotional value of the outcome is comparable.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Different mechanisms of attention controlling learning have been proposed in appetitive and aversive conditioning. The aim of the present study was to compare attention and learning in a Pavlovian conditioning paradigm using visual stimuli of varying predictive value of either monetary reward (appetitive conditioning; 10p or 50p) or blast of white noise (aversive conditioning; 97 dB or 102 dB). Outcome values were matched across the two conditions with regard to their emotional significance. Sixty-four participants were allocated to one of the four conditions matched for age and gender. All participants underwent a discriminative learning task using pairs of visual stimuli that signalled a 100%, 50%, or 0% probability of receiving an outcome. Learning was measured using a 9-point Likert scale of expectancy of the outcome, while attention using an eyetracker device. Arousal and emotional conditioning were also evaluated. Dwell time was greatest for the full predictor in the noise groups, while in the money groups attention was greatest for the partial predictor over the other two predictors. The progression of learning was the same for both groups. These findings suggest that in aversive conditioning attention is driven by the predictive salience of the stimulus while in appetitive conditioning attention is error-driven, when emotional value of the outcome is comparable. |
A J Austin; T Duka Mechanisms of attention to conditioned stimuli predictive of a cigarette outcome Journal Article Behavioural Brain Research, 232 (1), pp. 183–189, 2012. Abstract | Links | BibTeX @article{Austin2012,
title = {Mechanisms of attention to conditioned stimuli predictive of a cigarette outcome},
author = {A J Austin and T Duka},
url = {http://dx.doi.org/10.1016/j.bbr.2012.04.009},
doi = {10.1016/j.bbr.2012.04.009},
year = {2012},
date = {2012-01-01},
journal = {Behavioural Brain Research},
volume = {232},
number = {1},
pages = {183--189},
publisher = {Elsevier B.V.},
abstract = {Attention to stimuli associated with a rewarding outcome may be mediated by the incentive motivational properties that the stimulus acquires during conditioning. Other theories of attention state that the prediction error (the discrepancy between the expected and the actual outcome) during conditioning guides attention; once the outcome is fully predicted, attention should be abolished for the conditioned stimulus. The current study examined which of these mechanisms is dominant in conditioning when the outcome is highly rewarding. Allocation of attention to stimuli associated with cigarettes (the rewarding outcome) was tested in 16 smokers, who underwent a classical conditioning paradigm, where abstract visual stimuli were paired with a tobacco outcome. Stimuli were associated with 100% (stimulus A), 50% (stimulus B), or 0% (stimulus C) probability of receiving tobacco. Attention was measured using an eye-tracker device, and the appetitive value of the stimuli was measured with subjective pleasantness ratings during the conditioning process. Dwell time bias (duration of eye gaze) was greatest overall for the A stimulus, and increased over conditioning. Attention to stimulus A was dependent on the ratings of pleasantness that the stimulus evoked, and on the desire to smoke. These findings appear to support the theory that attention for conditioned stimuli is dominated by the incentive motivational qualities of the outcome they predict, and implicate a role for attention in the maintenance of addictive behaviours like smoking.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Attention to stimuli associated with a rewarding outcome may be mediated by the incentive motivational properties that the stimulus acquires during conditioning. Other theories of attention state that the prediction error (the discrepancy between the expected and the actual outcome) during conditioning guides attention; once the outcome is fully predicted, attention should be abolished for the conditioned stimulus. The current study examined which of these mechanisms is dominant in conditioning when the outcome is highly rewarding. Allocation of attention to stimuli associated with cigarettes (the rewarding outcome) was tested in 16 smokers, who underwent a classical conditioning paradigm, where abstract visual stimuli were paired with a tobacco outcome. Stimuli were associated with 100% (stimulus A), 50% (stimulus B), or 0% (stimulus C) probability of receiving tobacco. Attention was measured using an eye-tracker device, and the appetitive value of the stimuli was measured with subjective pleasantness ratings during the conditioning process. Dwell time bias (duration of eye gaze) was greatest overall for the A stimulus, and increased over conditioning. Attention to stimulus A was dependent on the ratings of pleasantness that the stimulus evoked, and on the desire to smoke. These findings appear to support the theory that attention for conditioned stimuli is dominated by the incentive motivational qualities of the outcome they predict, and implicate a role for attention in the maintenance of addictive behaviours like smoking. |
