Perceptual grouping-dependent lightness processing in human early visual cortex

Huseyin Boyaci, Fang Fang, Scott O. Murray, Daniel Kersten

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

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.

Original languageEnglish (US)
Article number4
JournalJournal of vision
Volume10
Issue number9
DOIs
StatePublished - 2010

Keywords

  • Lightness/brightness perception
  • Perceptual organization
  • Visual cortex

Fingerprint

Dive into the research topics of 'Perceptual grouping-dependent lightness processing in human early visual cortex'. Together they form a unique fingerprint.

Cite this