Visual Search for Feature and Conjunction Targets with an Attention Deficit

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Visual Search for Feature and Conjunction Targets with an Attention Deficit

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dc.contributor.author Arguin, Martin
dc.contributor.author Joanette, Yves
dc.contributor.author Cavanagh, Patrick
dc.date.accessioned 2010-02-03T16:53:27Z
dc.date.issued 1993
dc.identifier.citation Arguin, Martin, Yves Joanette, and Patrick Cavanagh. 1993. Visual search for feature and conjunction targets with an attention deficit. Journal of Cognitive Neuroscience 5(4): 436-452. en_US
dc.identifier.issn 0898-929X en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:3626283
dc.description.abstract Brain-damaged subjects who had previously been identified as suffering from a visual attention deficit for contralesional stimulation were tested on a series of visual search tasks. The experiments examined the hypothesis that the processing of single features is preattentive but that feature integration, necessary for the correct perception of conjunctions of features, requires attention (Treisman & Gelade, 1980 Treisman & Sato, 1990). Subjects searched for a feature target (orientation or color) or for a conjunction target (orientation and color) in unilateral displays in which the number of items presented was variable. Ocular fixation was controlled so that trials on which eye movements occurred were cancelled. While brain-damaged subjects with a visual attention disorder (VAD subjects) performed similarly to normal controls in feature search tasks, they showed a marked deficit in conjunction search. Specifically, VAD subjects exhibited an important reduction of their serial search rates for a conjunction target with contralesional displays. In support of Treisman's feature integration theory, a visual attention deficit leads to a marked impairment in feature integration whereas it does not appear to affect feature encoding. en_US
dc.description.sponsorship Psychology en_US
dc.language.iso en_US en_US
dc.publisher Massachusetts Institute of Technology Press en_US
dc.relation.isversionof doi:10.1162/jocn.1993.5.4.436 en_US
dash.license LAA
dc.title Visual Search for Feature and Conjunction Targets with an Attention Deficit en_US
dc.type Journal Article en_US
dc.description.version Proof en_US
dc.relation.journal Journal of Cognitive Neuroscience en_US
dash.depositing.author Cavanagh, Patrick
dc.date.available 2010-02-03T16:53:27Z

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