Researchers are increasingly aware of the benefits of combining eye tracking with other neurophysiological recording techniques such as electroencephalography (EEG) and functional near infrared spectroscopy (fNIRS). Simultaneous eye tracking and EEG/fNIRS recording allows researchers to monitor participant engagement and task-compliance, and track and control for potentially confounding factors such as saccades, microsaccades and blinks. Eye tracking also allows stimulus presentation to be controlled in a gaze-contingent manner, greatly increasing the range of perceptual and cognitive operations that can be explored. EyeLink systems provide a range of synchronization options, allowing researchers to employ advanced analytical techniques such as time locking the EEG and fNIRS data to specific oculomotor events.
Fast, Accurate and Reliable Eye Tracking
- Head free-to-move Remote Mode ensures that there is no interference with electrodes from head-stabilization equipment.
- Up to 2000 Hz binocular sampling rates, and exceptionally high levels of precision ensure even the smallest eye movements (including microsaccades) can be detected.
- Multiple synchronization options include Ethernet messaging and / or TTL signalling, as well as an analog output option.
EyeLink 1000 Plus
- The EyeLink 1000 Plus operates at a distance of 50-70cm from the sensor arrays and does not introduce noise into the recording environment.
- For sites that require the eye tracking hardware to be further than 70cm away, the fibre-optic camera upgrade and long range mount are ideal.
EyeLink Portable Duo
- The EyeLink Portable Duo also operates in both head-stabilized and remote, head free to move modes, and is ideal for EEG scenarios that do not require analog output or long camera to eye distances.
Software Solutions for EEG / fNIRs Research
SR Research Experiment Builder allows sophisticated cognitive psychology tasks to be implemented quickly and easily, and provides tools for synchronizing eye tracking and EEG / fNIRs data streams.
- Hundreds of existing templates for common tasks such as visual search, dot probe, change-blindness, cueing tasks and many many more.
- Precise timing delivery for text, images, audio and videos.
- Use common event markers in both eye tracking and EEG data stream to allow for experimental event-based (e.g. stimulus onset) and eye event-based ERP analysis (e.g., fixation related potentials).
- Millisecond precise recording of responses from button box / voice-key devices.
- Saccade, Fixation, Velocity and Invisible Boundary Triggers allow sophisticated gaze-contingent tasks to be produced with a few clicks of the mouse.
- Simple integration and data synchronization with MRI/MEG and a wide range of other recording equipment.
Eye tracking functionality can easily be added to existing stimulus presentation software. We provide templates and examples for Presentation, MATLAB and Psychtoolbox, E-Prime and many more.
