December 2007
Volume 7, Issue 15
Free
OSA Fall Vision Meeting Abstract  |   December 2007
Disparity processing in the human brain imaged with high density EEG
Author Affiliations
  • Suzanne McKee
    Smith-Kettlewell Eye Research Institute
  • Alex Wade
    Smith-Kettlewell Eye Research Institute
  • Mark Pettet
    Smith-Kettlewell Eye Research Institute
  • Vladimir Vildavski
    Smith-Kettlewell Eye Research Institute
  • Greg Appelbaum
    Duke University
  • Tony Norcia
    Smith-Kettlewell Eye Research Institute
Journal of Vision December 2007, Vol.7, 84. doi:10.1167/7.15.84
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      Suzanne McKee, Alex Wade, Mark Pettet, Vladimir Vildavski, Greg Appelbaum, Tony Norcia; Disparity processing in the human brain imaged with high density EEG. Journal of Vision 2007;7(15):84. doi: 10.1167/7.15.84.

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

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Abstract

Psychophysical thresholds for relative disparity are far better when test and reference targets are presented in the same plane than when targets are presented in two planes separated by a pedestal disparity. Is this sensitivity difference reflected in the aggregate neural responses of different visual areas? We used high-density EEG recording, combined with fMRI-defined regions of interest, to localize the responses to disparity modulation in four visual areas: V1, V3A, V4 and hMT+. The stimulus consisted of randomly-spaced vertical lines. Alternating horizontal strips of the line pattern were either static or modulated repetitively by a 6 arcmin change in disparity. We compared the responses to disparity modulation in the same plane to modulation when the static and modulated strips were separated by a fixed 6 arcmin disparity pedestal. All four areas gave larger responses to modulation in the same plane than to modulation with the 6 arcmin pedestal. However, the biggest difference was observed in area hMT+, not V1. Extra-striate areas do not simply mirror response amplitudes in V1. Indeed, the form of the temporal responses in extra-striate areas was markedly different from the V1 response, suggesting that extra-striate areas may encode disparity-generated surface organization, as well as disparity magnitude.

McKee, S. Wade, A. Pettet, M. Vildavski, V. Appelbaum, G. Norcia, T. (2007). Disparity processing in the human brain imaged with high density EEG [Abstract]. Journal of Vision, 7(15):84, 84a, http://journalofvision.org/7/15/84/, doi:10.1167/7.15.84. [CrossRef]
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