SR Research

Fast, Accurate, Reliable Eye Tracking

About Sam Hutton

Sam Hutton studied Experimental Psychology at the University of Sussex, and liked it so much he stayed there to do a PhD. His first encounter with an eye tracker was during his post-doctoral fellowship at Imperial College, London. He was based in the Neuro-opthalmology unit at Charing Cross Hospital for 6 years, and whilst there learned to use an ancient infrared eye tracking system to measure basic oculomotor function (prosaccades / antisaccades / smooth pursuit etc) in patients with neuropsychiatric and neurological disorders. He was hooked, and has been actively involved in eye tracking research in one way or another ever since. When not writing blogs (e.g. most of the time...) he works with the rest of the SR Research Support Team on a range of projects, taking a particular interest in issues involving eye tracking in clinical settings (for example eye tracking nystagmus / neurological disorders) and pupillometry. He can also be found teaching eye tracking workshops on a range of topics, and generally trying to make sure that people don't make the same mistakes he did. He loves to eye track animals, and has so far managed to record gaze from mice, cats, dogs and a duck...

Visual Angle

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

EyeLink Publications

Over the last couple of months we have been working hard updating our database of EyeLink publications. One big change we've made is that the eye tracking research papers listed on the website can now be searched - by year, author name, journal title and keywords. In addition, each reference is

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.