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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Title: Visual Search for Feature and Conjunction Targets with an Attention Deficit
Author: Arguin, Martin; Joanette, Yves; Cavanagh, Patrick

Note: Order does not necessarily reflect citation order of authors.

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.
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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.
Published Version: doi:10.1162/jocn.1993.5.4.436
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3626283

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  • FAS Scholarly Articles [7374]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

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