The influence of crystalline lens accommodation on post-saccadic oscillations in pupil-based eye trackers
Nyström, Marcus LU
; Andersson, Richard
LU
; Magnusson, Måns
LU
; Pansell, Tony
and Hooge, Ignace
(2015)
In Vision Research
107.
p.1-14
- Abstract
- It is well known that the crystalline lens (henceforth lens) can oscillate (or 'wobble') relative to the eyeball at the end of saccades. Recent research has proposed that such wobbling of the lens is a source of post-saccadic oscillations (PSOs) seen in data recorded by eye trackers that estimate gaze direction from the location of the pupil. Since the size of the lens wobbles increases with accommodative effort, one would predict a similar increase of PSO-amplitude in data recorded with a pupil based eye tracker. In four experiments, we investigated the role of lens accommodation on PSOs in a video-based eye tracker. In Experiment 1, we replicated previous results showing that PSO-amplitudes increase at near viewing distances (large... (More)
- It is well known that the crystalline lens (henceforth lens) can oscillate (or 'wobble') relative to the eyeball at the end of saccades. Recent research has proposed that such wobbling of the lens is a source of post-saccadic oscillations (PSOs) seen in data recorded by eye trackers that estimate gaze direction from the location of the pupil. Since the size of the lens wobbles increases with accommodative effort, one would predict a similar increase of PSO-amplitude in data recorded with a pupil based eye tracker. In four experiments, we investigated the role of lens accommodation on PSOs in a video-based eye tracker. In Experiment 1, we replicated previous results showing that PSO-amplitudes increase at near viewing distances (large vergence angles), when the lens is highly accommodated. In Experiment 2a, we manipulated the accommodative state of the lens pharmacologically using eye drops at a fixed viewing distance and found, in contrast to Experiment 1, no significant difference in PSO-amplitude related to the accommodative state of the lens. Finally, in Experiment 2b, the effect of vergence angle was investigated by comparing PSO-amplitudes at near and far while maintaining a fixed lens accommodation. Despite the pharmacologically fixed degree of accommodation, PSO-amplitudes were systematically larger in the near condition. In summary, PSOs cannot exhaustively be explained by lens wobbles. Possible confounds related to pupil size and eye-camera angle are investigated in Experiments 3 and 4, and alternative mechanisms behind PSOs are probed in the discussion. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4909556
- author
- Nyström, Marcus
LU
; Andersson, Richard
LU
; Magnusson, Måns
LU
; Pansell, Tony
and Hooge, Ignace
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Vision Research
- volume
- 107
- pages
- 1 - 14
- publisher
- Elsevier
- external identifiers
-
- pmid:25481633
- wos:000348632600001
- scopus:84918820960
- pmid:25481633
- ISSN
- 1878-5646
- DOI
- 10.1016/j.visres.2014.10.037
- language
- English
- LU publication?
- yes
- id
- ee71e516-bbfe-4f34-9c3b-983cee83c2cd (old id 4909556)
- alternative location
- http://www.ncbi.nlm.nih.gov/pubmed/25481633?dopt=Abstract
- date added to LUP
- 2016-04-01 10:15:58
- date last changed
- 2023-01-17 18:12:09
@article{ee71e516-bbfe-4f34-9c3b-983cee83c2cd,
abstract = {{It is well known that the crystalline lens (henceforth lens) can oscillate (or 'wobble') relative to the eyeball at the end of saccades. Recent research has proposed that such wobbling of the lens is a source of post-saccadic oscillations (PSOs) seen in data recorded by eye trackers that estimate gaze direction from the location of the pupil. Since the size of the lens wobbles increases with accommodative effort, one would predict a similar increase of PSO-amplitude in data recorded with a pupil based eye tracker. In four experiments, we investigated the role of lens accommodation on PSOs in a video-based eye tracker. In Experiment 1, we replicated previous results showing that PSO-amplitudes increase at near viewing distances (large vergence angles), when the lens is highly accommodated. In Experiment 2a, we manipulated the accommodative state of the lens pharmacologically using eye drops at a fixed viewing distance and found, in contrast to Experiment 1, no significant difference in PSO-amplitude related to the accommodative state of the lens. Finally, in Experiment 2b, the effect of vergence angle was investigated by comparing PSO-amplitudes at near and far while maintaining a fixed lens accommodation. Despite the pharmacologically fixed degree of accommodation, PSO-amplitudes were systematically larger in the near condition. In summary, PSOs cannot exhaustively be explained by lens wobbles. Possible confounds related to pupil size and eye-camera angle are investigated in Experiments 3 and 4, and alternative mechanisms behind PSOs are probed in the discussion.}},
author = {{Nyström, Marcus and Andersson, Richard and Magnusson, Måns and Pansell, Tony and Hooge, Ignace}},
issn = {{1878-5646}},
language = {{eng}},
pages = {{1--14}},
publisher = {{Elsevier}},
series = {{Vision Research}},
title = {{The influence of crystalline lens accommodation on post-saccadic oscillations in pupil-based eye trackers}},
url = {{http://dx.doi.org/10.1016/j.visres.2014.10.037}},
doi = {{10.1016/j.visres.2014.10.037}},
volume = {{107}},
year = {{2015}},
}