Visual Probe Task
Required Experiment Builder Version: 2.3.38 or higher
EyeLink Required: Yes
Type: Complete Example
Difficulty Level: Easy / Intermediate
This example demonstrates:
Description:
This example shows one approach to a visual dot probe task. In the example, the participant sees a centrally presented fixation cross for 500 ms, followed by two horizontally side-by-side images presented for a duration specified in the Data Source (varies by trial). After the image presentation, a black X is presented as the probe on an otherwise blank screen, positioned where one of the images were previously displayed. The probe display remains until either the participant responds with a p or q keyboard key press or 5 seconds elapse without response, after which a blank screen is presented, trial variables are recorded to a text results file, and the trial ends. The task is to press q during the probe display if the probe is on the left, or p if the probe is on the right.
Instructions:
VisualProbe.ebz (Size: 431.06 KB / Downloads: 7)
Required Experiment Builder Version: 2.3.38 or higher
EyeLink Required: Yes
Type: Complete Example
Difficulty Level: Easy / Intermediate
This example demonstrates:
- How to use the Randomization Setting section of the Data Source to set up basic trial randomization.
- How to link stimulus/interest area locations and presentation durations to the Data Source.
- How to determine trial response accuracy based on Data Source and participant keypress information.
- How to use a Results File node to save trial variable data to a plain text file.
Description:
This example shows one approach to a visual dot probe task. In the example, the participant sees a centrally presented fixation cross for 500 ms, followed by two horizontally side-by-side images presented for a duration specified in the Data Source (varies by trial). After the image presentation, a black X is presented as the probe on an otherwise blank screen, positioned where one of the images were previously displayed. The probe display remains until either the participant responds with a p or q keyboard key press or 5 seconds elapse without response, after which a blank screen is presented, trial variables are recorded to a text results file, and the trial ends. The task is to press q during the probe display if the probe is on the left, or p if the probe is on the right.
Instructions:
- Download the VisualProbe.ebz example from this message.
- Launch the Experiment Builder application.
- Unpack the VisualProbe.ebz file to a location on your Experiment Builder PC with "File menu -> Unpack".
- Open the project in Experiment Builder.
- Deploy the project to a new folder.
- Run the VisualProbe.exe from the deployed directory.
VisualProbe.ebz (Size: 431.06 KB / Downloads: 7)