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The art of braking : post saccadic oscillations in the eye tracker signal decrease with increasing saccade size

Hooge, Ignace; Nyström, Marcus LU ; Cornelissen, Tim and Holmqvist, Kenneth LU (2015) In Vision Research 112. p.55-67
Abstract (Swedish)
Abstract in Undetermined

Recent research has shown that the pupil signal from video-based eye trackers contains post saccadic oscillations (PSOs). These reflect pupil motion relative to the limbus (Nyström, Hooge, & Holmqvist, 2013). More knowledge about video-based eye tracker signals is essential to allow comparison between the findings obtained from modern systems, and those of older eye tracking technologies (e.g. coils and measurement of the Dual Purkinje Image-DPI). We investigated PSOs in horizontal and vertical saccades of different sizes with two high quality video eye trackers. PSOs were very similar within observers, but not between observers. PSO amplitude decreased with increasing saccade size, and this... (More)
Abstract in Undetermined

Recent research has shown that the pupil signal from video-based eye trackers contains post saccadic oscillations (PSOs). These reflect pupil motion relative to the limbus (Nyström, Hooge, & Holmqvist, 2013). More knowledge about video-based eye tracker signals is essential to allow comparison between the findings obtained from modern systems, and those of older eye tracking technologies (e.g. coils and measurement of the Dual Purkinje Image-DPI). We investigated PSOs in horizontal and vertical saccades of different sizes with two high quality video eye trackers. PSOs were very similar within observers, but not between observers. PSO amplitude decreased with increasing saccade size, and this effect was even stronger in vertical saccades; PSOs were almost absent in large vertical saccades. Based on this observation we conclude that the occurrence of PSOs is related to deceleration at the end of a saccade. That PSOs are saccade size dependent and idiosyncratic is a problem for algorithmic determination of saccade endings. Careful description of the eye tracker, its signal, and the procedure used to extract saccades is required to enable researchers to compare data from different eye trackers. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Vision Research
volume
112
pages
55 - 67
publisher
Elsevier
external identifiers
  • pmid:25982715
  • wos:000356121100006
  • scopus:84930221865
ISSN
1878-5646
DOI
10.1016/j.visres.2015.03.015
language
English
LU publication?
yes
id
0c3f1b31-5016-4de2-9227-459d3f5bc478 (old id 5158970)
date added to LUP
2015-03-25 14:57:13
date last changed
2017-10-22 03:01:03
@article{0c3f1b31-5016-4de2-9227-459d3f5bc478,
  abstract     = {<b>Abstract in Undetermined</b><br/><br>
Recent research has shown that the pupil signal from video-based eye trackers contains post saccadic oscillations (PSOs). These reflect pupil motion relative to the limbus (Nyström, Hooge, &amp; Holmqvist, 2013). More knowledge about video-based eye tracker signals is essential to allow comparison between the findings obtained from modern systems, and those of older eye tracking technologies (e.g. coils and measurement of the Dual Purkinje Image-DPI). We investigated PSOs in horizontal and vertical saccades of different sizes with two high quality video eye trackers. PSOs were very similar within observers, but not between observers. PSO amplitude decreased with increasing saccade size, and this effect was even stronger in vertical saccades; PSOs were almost absent in large vertical saccades. Based on this observation we conclude that the occurrence of PSOs is related to deceleration at the end of a saccade. That PSOs are saccade size dependent and idiosyncratic is a problem for algorithmic determination of saccade endings. Careful description of the eye tracker, its signal, and the procedure used to extract saccades is required to enable researchers to compare data from different eye trackers.},
  author       = {Hooge, Ignace and Nyström, Marcus and Cornelissen, Tim and Holmqvist, Kenneth},
  issn         = {1878-5646},
  language     = {eng},
  pages        = {55--67},
  publisher    = {Elsevier},
  series       = {Vision Research},
  title        = {The art of braking : post saccadic oscillations in the eye tracker signal decrease with increasing saccade size},
  url          = {http://dx.doi.org/10.1016/j.visres.2015.03.015},
  volume       = {112},
  year         = {2015},
}