Dynamic surrounds of receptive fields in primate striate cortex: A physiological basis for perceptual completion?

M. Fiorani, M. G P Rosa, R. Gattass, C. E. Rocha-Miranda

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128 Citations (Scopus)

Abstract

Visual receptive fields (RFs) were mapped inside and outside the cortical representation of the optic disk in the striate cortex (area V1) of anesthetized and paralyzed Cebus monkeys. Unexpectedly, most cells were found to be binocularly driven, and the RFs mapped with contralateral-eye stimulation progressed in a topographically appropriate fashion as the optic disk sector was crossed. Activation of these neurons by the contralateral eye was shown to depend on stimulation of the parts of the retina around the optic disk. Outside the optic disk representation, a similar effect was demonstrated by obstructing the 'classical' RF with masks 5-10 times larger in size. In all cases, visual stimuli presented around the mask could be used to accurately interpolate the position of the hidden RF. These properties reflect, at a cellular level, the process of 'filling in' that allows for completion of the visual image across natural and artificially induced scotomas.

Original languageEnglish
Pages (from-to)8547-8551
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume89
Issue number18
Publication statusPublished - 1 Jan 1992
Externally publishedYes

Keywords

  • monkey
  • optic disk
  • receptive-field structure
  • visual cortex
  • visual psychophysics

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