August 2014
Volume 14, Issue 10
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2014
The influence of crowding on eye movements: A preliminary study
Author Affiliations
  • Senay Aydin
    Anglia Vision Research, Department of Vision and Hearing Sciences, Anglia Ruskin University, Cambridge, United Kingdom.
  • Mofiyinfoluwa Adeleye
    Anglia Vision Research, Department of Vision and Hearing Sciences, Anglia Ruskin University, Cambridge, United Kingdom.
  • John Siderov
    Anglia Vision Research, Department of Vision and Hearing Sciences, Anglia Ruskin University, Cambridge, United Kingdom.
  • Akash S. Chima
    Anglia Vision Research, Department of Vision and Hearing Sciences, Anglia Ruskin University, Cambridge, United Kingdom.
  • Harold E. Bedell
    University of Houston, College of Optometry, Houston, USA.
  • Sarah J. Waugh
    Anglia Vision Research, Department of Vision and Hearing Sciences, Anglia Ruskin University, Cambridge, United Kingdom.
  • Josselin Gautier
    Anglia Vision Research, Department of Vision and Hearing Sciences, Anglia Ruskin University, Cambridge, United Kingdom.
Journal of Vision August 2014, Vol.14, 1211. doi:10.1167/14.10.1211
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      Senay Aydin, Mofiyinfoluwa Adeleye, John Siderov, Akash S. Chima, Harold E. Bedell, Sarah J. Waugh, Josselin Gautier; The influence of crowding on eye movements: A preliminary study. Journal of Vision 2014;14(10):1211. doi: 10.1167/14.10.1211.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

It is well known that nearby contours impair visual discrimination, a phenomenon, which is defined as crowding. We used letter targets with different surrounding features to investigate the influence of foveal crowding on fixation. Six participants, aged between 20-36 years, monocularly fixated on 6 different high-contrast targets presented at 0.1 logMAR above resolution threshold: a single letter H; a letter H surrounded by 4 flanking bars at either 1 or 2 stroke widths; a letter H surrounded by 4 flanking letters at either 1 or 2 stroke widths; and a line of 7 identical letter Hs. Participants sat 4m from the target display with head movements restrained by a forehead rest and bite-bar. The participants were instructed to keep their gaze directed at the center of the stimulus as stably as possible throughout each 15s trial. Each trial was shown 8 times and stimuli were presented in a random order.The horizontal and vertical position of the viewing eye was recorded using an Eyelink II at a sampling frequency of 250 Hz. The results indicate that fixation stability, expressed as log bivariate contour ellipse area, was generally poorer for the line of letters than when fixating on a single letter target. Fixation stability assessed using differently crowded letter targets appears relatively unaffected by surrounding crowding features except when the fixation letter is located in a line of similar targets. This result is consistent with the notion that observers can sometimes lose their place in a line acuity task.

Meeting abstract presented at VSS 2014

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