The concept of visual angle is critical to many aspects of eye tracking research, but it is one of those things that people are somehow just expected to understand. This blog is my attempt to explain visual angle in the way I wish someone had explained it to me, e.g. with the bare minimum of math...
Eye Tracking for Pupillometry
Researchers are increasingly using eye trackers to explore changes in pupil size (pupillometry) in order to reveal insights into cognitive processes. EyeLink eye trackers are capable of detecting changes in pupil size of just 0.1% of the pupil diameter, and their high sampling rates allow pupilliary
Eye Tracking and EEG
Researchers are increasingly aware of the benefits of combining eye tracking with EEG and other neurophysiological recording equipment. One of the most common rationales for recording simultaneous EEG and eye tracking data is "artefact rejection." Blinks and eye movements themselves (even tiny
How does eye tracking work?
Only a generation ago, eye tracking typically required complex and expensive equipment and considerable technical expertise on the part of the researcher. Analyzing eye movement data was often a slow and laborious process. As such, it is perhaps unsurprising that it was a relative niche field.
What is eye tracking?
What is eye tracking? Put simply, eye tracking is the process of measuring eye movements. A typical goal for eye tracking research is to establish where people look (i.e., their “point of regard” or “gaze"). To this end, scientists usually use a video-based eye tracker, such as the EyeLink 1000 Plus.