Abstract：
:While it is known that scleral search coils-measuring the rotation of the eye globe--and modern, video based eye trackers-tracking the center of the pupil and the corneal reflection (CR)--produce signals with different properties, the mechanisms behind the differences are less investigated. We measure how the size of the pupil affects the eye-tracker signal recorded during saccades with a common pupil-CR eye-tracker. Eye movements were collected from four healthy participants and one person with an aphakic eye while performing self-paced, horizontal saccades at different levels of screen luminance and hence pupil size. Results show that pupil-, and gaze-signals, but not the CR-signal, are affected by the size of the pupil; changes in saccade peak velocities in the gaze signal of more than 30% were found. It is important to be aware of this pupil size dependent change when comparing fine grained oculomotor behavior across participants and conditions.
journal_name
Vision Resjournal_title
Vision researchauthors
Nyström M,Hooge I,Andersson Rdoi
10.1016/j.visres.2016.01.009subject
Has Abstractpub_date
2016-04-01 00:00:00pages
95-103eissn
0042-6989issn
1878-5646pii
S0042-6989(16)00038-9journal_volume
121pub_type
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