Visual Grouping in Human Parietal Cortex

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Visual Grouping in Human Parietal Cortex

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dc.contributor.author Chun, Marvin M.
dc.contributor.author Xu, Yaoda
dc.date.accessioned 2009-09-21T13:29:29Z
dc.date.issued 2007
dc.identifier.citation Xu, Yaoda and Marvin M. Chun. 2007. Visual grouping in human parietal cortex. Proceedings of the National Academy of Sciences of the United States of America 104(47): 18766-18771. en_US
dc.identifier.issn 1091-6490 en_US
dc.identifier.issn 0027-8424 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:3296249
dc.description.abstract To efficiently extract visual information from complex visual scenes to guide behavior and thought, visual input needs to be organized into discrete units that can be selectively attended and processed. One important such selection unit is visual objects. A crucial factor determining object-based selection is the grouping between visual elements. Although human lesion data have pointed to the importance of the parietal cortex in object-based representations, our understanding of these parietal mechanisms in normal human observers remains largely incomplete. Here we show that grouped shapes elicited lower functional MRI (fMRI) responses than ungrouped shapes in inferior intraparietal sulcus (IPS) even when grouping was task-irrelevant. This relative ease of representing grouped shapes allowed more shape information to be passed onto later stages of visual processing, such as information storage in superior IPS, and may explain why grouped visual elements are easier to perceive than ungrouped ones after parietal brain lesions. These results are discussed within a neural object file framework, which argues for distinctive neural mechanisms supporting object individuation and identification in visual perception. en_US
dc.description.sponsorship Psychology en_US
dc.language.iso en_US en_US
dc.publisher National Academy of Sciences en_US
dc.relation.isversionof http://dx.doi.org/10.1073/pnas.0705618104 en_US
dc.relation.hasversion http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=2141851 en_US
dash.license LAA
dc.subject fMRI en_US
dc.subject working memory en_US
dc.subject visual attention en_US
dc.subject object processing en_US
dc.subject brain imaging en_US
dc.subject functional MRI en_US
dc.title Visual Grouping in Human Parietal Cortex en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal Proceedings of the National Academy of Sciences en_US
dash.depositing.author Xu, Yaoda
dc.date.available 2014-10-22T07:30:37Z

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