May 2003
Volume 44, Issue 13
ARVO Annual Meeting Abstract  |   May 2003
Saccadic Compression of Visual Space Is Significantly Influenced by Retinal Illumination
Author Affiliations & Notes
  • A. Ma-Wyatt
    School of Psychology, The University of Western Australia, Perth, Australia
  • M. Morrone
    Universita'Vita-Salute S.Raffaele, Milan, Italy
  • J. Ross
    Universita'Vita-Salute S.Raffaele, Milan, Italy
  • Footnotes
    Commercial Relationships  A. Ma-Wyatt, None; M. Morrone, None; J. Ross, None.
  • Footnotes
    Support  Australian Research Council; Human Frontiers Science Foundation
Investigative Ophthalmology & Visual Science May 2003, Vol.44, 4105. doi:
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      A. Ma-Wyatt, M. Morrone, J. Ross; Saccadic Compression of Visual Space Is Significantly Influenced by Retinal Illumination . Invest. Ophthalmol. Vis. Sci. 2003;44(13):4105.

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

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Abstract: : Purpose: If a bar is flashed just before a subject starts to make a saccade, subjects mislocalise its position in space when making a verbal report but not if they point with hand unseen (Burr, Ross and Morrone, 2001). We have demonstrated that compression can occur for both verbal report and pointing if a blinding flash – providing light but no visual references – occurs shortly after the initiation of a saccade We investigated whether this distinction between responses for perception and action is contingent upon the duration of a delay before responding, or whether it was due to light level. Methods: Subjects made a 15° horizontal saccade. A bar was flashed just before the subject started to make the saccade, and after the target to saccade to was presented. Subjects viewed a touchscreen through a liquid crystal shutter. The shutter closed at a variable duration after the initiation of a saccade. Subjects were tested either in the dark, or with a blinding flash yoked to the closing of the shutter. Subjects made either a verbal report of the perceived position of the bar, or pointed with hand unseen. Results: Compression for verbal report was found both in the dark and with a flash, consistent with earlier findings. Compression for pointing was present if a flash occurred, or at very long shutter durations but not in the dark. Conclusions: A dissociation between compression for verbal report and pointing may be dependent on retinal illumination at the time of response.

Keywords: eye movements • vision and action • space and scene perception 

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