August 2010
Volume 10, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   August 2010
Long distance disparity processing in the human visual cortex: an EEG source imaging study
Author Affiliations
  • Benoit Cottereau
    The Smith-Kettlewell Eye Research Institute, San Francisco
  • Anthony Norcia
    The Smith-Kettlewell Eye Research Institute, San Francisco
  • Tzu-Hsun Tsai
    Department of Ophthalmology, National Taiwan University Hospital, Taipei, Taiwan
  • Suzanne Mckee
    The Smith-Kettlewell Eye Research Institute, San Francisco
Journal of Vision August 2010, Vol.10, 378. doi:10.1167/10.7.378
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      Benoit Cottereau, Anthony Norcia, Tzu-Hsun Tsai, Suzanne Mckee; Long distance disparity processing in the human visual cortex: an EEG source imaging study. Journal of Vision 2010;10(7):378. doi: 10.1167/10.7.378.

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

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Abstract

We estimated the relative disparity response of neural populations in different visual areas in human cortex with visual evoked potentials and source localization methods. Using dense dynamic random dot patterns, we modulated the disparity of a central disk (4°diameter) from 0 to 12.6′ uncrossed disparity at 2 Hz. The disk was surrounded by a static annulus (16° outside diameter) presented in the fixation plane. We varied the gap separating the disk from the annulus parametrically from 0 to 5.5 degrees in six separate conditions. We compared the response amplitudes as a function of gap size to responses to the disk alone within fMRI-defined ROI′s across the visual cortex. Based on the average signal-to-noise ratio (6 subjects) for the first harmonic (2Hz), we found that there was no change in response amplitude for small separations (<0.5 deg) in all visual areas. At larger separations, the amplitudes in V2 and V3 ROIs decreased to levels comparable to those obtained in the absence of a surround. However, in the V3A ROI, the amplitude remained constant until the gap size exceeded 4° and then fell to the level observed for the no-surround condition. To determine whether this effect was due to the decreasing size of the annular surround, we performed a control experiment, using two annuli of vastly different areas, but separated from the disk by the same gap width (0.5 deg); the responses were identical for these two surrounds. Altogether, these results suggest that area V3A possesses neurons responsive to relative disparity whose receptive fields allow a robust estimation of relative depth even for disparities separated by up to 4 degrees.

Cottereau, B. Norcia, A. Tsai, T.-H. Mckee, S. (2010). Long distance disparity processing in the human visual cortex: an EEG source imaging study [Abstract]. Journal of Vision, 10(7):378, 378a, http://www.journalofvision.org/content/10/7/378, doi:10.1167/10.7.378. [CrossRef]
Footnotes
 NEI R01 EY018875, RPB Disney award for amplyopia research.
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