Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Pupil size influences the eye-tracker signal during saccades

Nyström, Marcus LU orcid ; 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)
Please use this url to cite or link to this publication:
author
; and
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
  • pmid:26940030
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
2016-04-01 10:16:34
date last changed
2023-02-11 18:17:22
@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}},
  doi          = {{10.1016/j.visres.2016.01.009}},
  volume       = {{121}},
  year         = {{2016}},
}