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Fixational eye movements predict visual sensitivity

Scholes, Chris; McGraw, Paul; Nyström, Marcus LU and Roach, Neil (2015) In Royal Society of London. Proceedings B. Biological Sciences 282(1817).
Abstract (Swedish)
Abstract in Undetermined

During steady fixation, observers make small fixational saccades at a rate of around 1-2 per second. Presentation of a visual stimulus triggers a biphasic modulation in fixational saccade rate-an initial inhibition followed by a period of elevated rate and a subsequent return to baseline. Here we show that, during passive viewing, this rate signature is highly sensitive to small changes in stimulus contrast. By training a linear support vector machine to classify trials in which a stimulus is either present or absent, we directly compared the contrast sensitivity of fixational eye movements with individuals' psychophysical judgements. Classification accuracy closely matched psychophysical... (More)
Abstract in Undetermined

During steady fixation, observers make small fixational saccades at a rate of around 1-2 per second. Presentation of a visual stimulus triggers a biphasic modulation in fixational saccade rate-an initial inhibition followed by a period of elevated rate and a subsequent return to baseline. Here we show that, during passive viewing, this rate signature is highly sensitive to small changes in stimulus contrast. By training a linear support vector machine to classify trials in which a stimulus is either present or absent, we directly compared the contrast sensitivity of fixational eye movements with individuals' psychophysical judgements. Classification accuracy closely matched psychophysical performance, and predicted individuals' threshold estimates with less bias and overall error than those obtained using specific features of the signature. Performance of the classifier was robust to changes in the training set (novel subjects and/or contrasts) and good prediction accuracy was obtained with a practicable number of trials. Our results indicate a tight coupling between the sensitivity of visual perceptual judgements and fixational eye control mechanisms. This raises the possibility that fixational saccades could provide a novel and objective means of estimating visual contrast sensitivity without the need for observers to make any explicit judgement. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Royal Society of London. Proceedings B. Biological Sciences
volume
282
issue
1817
publisher
Royal Society
external identifiers
  • pmid:26468244
  • wos:000363485700008
  • scopus:84945207662
ISSN
1471-2954
DOI
10.1098/rspb.2015.1568
language
English
LU publication?
yes
id
70e20b65-0c18-4c0b-8f74-4f8e789ef1a2 (old id 8057187)
date added to LUP
2015-10-20 15:51:53
date last changed
2017-09-03 03:20:31
@article{70e20b65-0c18-4c0b-8f74-4f8e789ef1a2,
  abstract     = {<b>Abstract in Undetermined</b><br/><br>
During steady fixation, observers make small fixational saccades at a rate of around 1-2 per second. Presentation of a visual stimulus triggers a biphasic modulation in fixational saccade rate-an initial inhibition followed by a period of elevated rate and a subsequent return to baseline. Here we show that, during passive viewing, this rate signature is highly sensitive to small changes in stimulus contrast. By training a linear support vector machine to classify trials in which a stimulus is either present or absent, we directly compared the contrast sensitivity of fixational eye movements with individuals' psychophysical judgements. Classification accuracy closely matched psychophysical performance, and predicted individuals' threshold estimates with less bias and overall error than those obtained using specific features of the signature. Performance of the classifier was robust to changes in the training set (novel subjects and/or contrasts) and good prediction accuracy was obtained with a practicable number of trials. Our results indicate a tight coupling between the sensitivity of visual perceptual judgements and fixational eye control mechanisms. This raises the possibility that fixational saccades could provide a novel and objective means of estimating visual contrast sensitivity without the need for observers to make any explicit judgement.},
  articleno    = {20151568},
  author       = {Scholes, Chris and McGraw, Paul and Nyström, Marcus and Roach, Neil},
  issn         = {1471-2954},
  language     = {eng},
  number       = {1817},
  publisher    = {Royal Society},
  series       = {Royal Society of London. Proceedings B. Biological Sciences},
  title        = {Fixational eye movements predict visual sensitivity},
  url          = {http://dx.doi.org/10.1098/rspb.2015.1568},
  volume       = {282},
  year         = {2015},
}