Eye Tracking in MEG

• Published in: Attention, perception & psychophysics Vol. 87; no. 1; pp. 238 - 244
• Main Authors: Saarinen, Veli-Matti, Jousmäki, Veikko
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.01.2025; Springer Nature B.V
• Subjects: Attention - physiology; Behavioral Science and Psychology; Brain; Brain research; Camcorders; Cameras; Cognitive Psychology; Electroencephalography; Eye movements; Eye Movements - physiology; Eye-Tracking Technology - instrumentation; Fixation, Ocular - physiology; Humans; Influence of Technology; Magnetic fields; Magnetoencephalography - instrumentation; Magnetoencephalography - methods; Medical imaging; Motor Reactions; Neuroimaging; Psychology; Sampling; Sensors; Video Technology; Canada; Finland; Magnetoencephalography; Eye tracking
• ISSN: 1943-3921; 1943-393X; 1943-393X
• DOI: 10.3758/s13414-024-02847-0

Magnetoencephalography (MEG) can measure brain activity in ms-level temporal resolution. MEG sensors are super sensitive devices for magnetic signals of the brain but are also prone to electromagnetic interferences. The MEG device is located inside the magnetically shielded room (MSR), and any monitoring device used inside the MSR requires special shielding and its location must be carefully selected to suppress electromagnetic interference. Eye-tracker measures eye movements, providing spatial location of the gaze, pupil diameters, and eye blinks. Eye tracking in MEG enables, for example, categorization of the MEG data based on gaze position and interactive stimulus using gaze position. Combining the methods together will require considering the electromagnetic interference for the MEG—that is, additional shielding, positioning of the eye tracker, and subject-specific issues related to make-up and eye-corrective lenses.