Perceptual grouping-dependent lightness processing in human early visual cortex

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buir.contributor.authorBoyacı, Hüseyin
dc.citation.epage12en_US
dc.citation.issueNumber9en_US
dc.citation.spage1en_US
dc.citation.volumeNumber10en_US
dc.contributor.authorBoyaci, H.en_US
dc.contributor.authorFang, F.en_US
dc.contributor.authorMurray, S. O.en_US
dc.contributor.authorKersten, D.en_US
dc.date.accessioned2016-02-08T09:55:24Z
dc.date.available2016-02-08T09:55:24Z
dc.date.issued2010en_US
dc.departmentDepartment of Psychologyen_US
dc.departmentNational Magnetic Resonance Research Center (UMRAM)en_US
dc.departmentAysel Sabuncu Brain Research Center (BAM)en_US
dc.description.abstractLightness, 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.en_US
dc.identifier.doi10.1167/10.9.4en_US
dc.identifier.eissn1534-7362
dc.identifier.urihttp://hdl.handle.net/11693/22088
dc.language.isoEnglishen_US
dc.publisherAssociation for Research in Vision and Ophthalmologyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1167/10.9.4en_US
dc.source.titleJournal of Visionen_US
dc.subjectLightness/brightness perceptionen_US
dc.subjectPerceptual organizationen_US
dc.subjectVisual cortexen_US
dc.titlePerceptual grouping-dependent lightness processing in human early visual cortexen_US
dc.typeArticleen_US
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Department of Psychology
Aysel Sabuncu Brain Research Center (BAM)
National Magnetic Resonance Research Center (UMRAM)