Switch to full screen mode (F11),
maximize the brightness of your screen,
than click on the START EXPERIMENT button to start.
Look at
this circle
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Horizontal axis → time in seconds, Vertical axis → <pupilRadius>/<irisRadius>
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The experimental setup is inspired by the paper of Edwin S. Dalmaijer from the Department of Experimental Psychology, University of Oxford, Oxford, United Kingdom published in November 2014. The author compares a low-cost eye tracker (the EyeTribe eye tracker) with an expensive one. The pupillometry is tested in the section 3.3. You can find this publication here.
We use Jeeliz pupillometry to measure the radius of the pupil. The github repository of the project can be found here.