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      • Faculty of Economics, Administrative And Social Sciences
      • Department of Psychology
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      Perceptual grouping-dependent lightness processing in human early visual cortex

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      Author(s)
      Boyaci, H.
      Fang, F.
      Murray, S. O.
      Kersten, D.
      Date
      2010
      Source Title
      Journal of Vision
      Electronic ISSN
      1534-7362
      Publisher
      Association for Research in Vision and Ophthalmology
      Volume
      10
      Issue
      9
      Pages
      1 - 12
      Language
      English
      Type
      Article
      Item Usage Stats
      145
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      105
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      Abstract
      Lightness, the perceived relative achromatic reectance of a surface, depends strongly on the context within which the surface is viewed. Modest changes in the two-dimensional conguration or three-dimensional scene geometry may lead to profound variations in lightness even though the surface luminance remains constant. Despite recent progress, we are far from a complete understanding of how various aspects of spatial context affect lightness processing in the cortex. Here we use a novel stimulus to show that perceptual grouping through occluders can affect lightness. We first report behavioral results showing how lightness across occlusion depends on spatially distant image features, including luminance and contrast. Next using functional magnetic resonance imaging (fMRI) we show that human early visual cortex responds strongly to occlusion-dependent lightness variations with little or no attention. These results suggest that elements of three-dimensional scene interpretation play a role in early cortical processing of lightness.
      Keywords
      Lightness/brightness perception
      Perceptual organization
      Visual cortex
      Permalink
      http://hdl.handle.net/11693/22088
      Published Version (Please cite this version)
      http://dx.doi.org/10.1167/10.9.4
      Collections
      • Aysel Sabuncu Brain Research Center (BAM) 213
      • Department of Psychology 191
      • National Magnetic Resonance Research Center (UMRAM) 218
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