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Pupil size influences the eye-tracker signal during saccades

Nyström, Marcus LU ; Hooge, Ignace LU and Andersson, Richard LU (2016) In Vision Research 121. p.95-103
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Vision Research
volume
121
pages
95 - 103
publisher
Elsevier
external identifiers
  • pmid:26940030
  • scopus:84959349771
  • wos:000373658700010
ISSN
1878-5646
DOI
10.1016/j.visres.2016.01.009
language
English
LU publication?
yes
id
c787bffe-b9e2-4062-8a76-bafab6399951 (old id 8564398)
date added to LUP
2016-01-21 15:00:12
date last changed
2017-09-03 03:13:34
@article{c787bffe-b9e2-4062-8a76-bafab6399951,
  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.},
  author       = {Nyström, Marcus and Hooge, Ignace and Andersson, Richard},
  issn         = {1878-5646},
  language     = {eng},
  pages        = {95--103},
  publisher    = {Elsevier},
  series       = {Vision Research},
  title        = {Pupil size influences the eye-tracker signal during saccades},
  url          = {http://dx.doi.org/10.1016/j.visres.2016.01.009},
  volume       = {121},
  year         = {2016},
}