Contrast-dependent changes in spatial frequency tuning of macaque V1 neurons: Effects of a changing receptive field size

Michael P. Sceniak, Michael J. Hawken, Robert Shapley

Research output: Contribution to journalArticle

Abstract

Previous studies on single neurons in primary visual cortex have reported that selectivity for orientation and spatial frequency tuning do not change with stimulus contrast. The prevailing hypothesis is that contrast scales the response magnitude but does not differentially affect particular stimuli. Models where responses are normalized over contrast to maintain constant tuning for parameters such as orientation and spatial frequency have been proposed to explain these results. However, our results indicate that a fundamental property of receptive field organization, spatial summation, is not contrast invariant. We examined the spatial frequency tuning of cells that show contrast-dependent changes in spatial summation and have found that spatial frequency selectivity also depends on stimulus contrast. These results indicate that contrast changes in the spatial frequency tuning curves result from spatial reorganization of the receptive field.

Original languageEnglish (US)
Pages (from-to)1363-1373
Number of pages11
JournalJournal of neurophysiology
Volume88
Issue number3
DOIs
StatePublished - Sep 2002

ASJC Scopus subject areas

  • Neuroscience(all)
  • Physiology

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