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Visual search for feature and conjunction targets with an attention deficit.

Reports 3 experiments in which brain-damaged Ss suffering from a visual attention deficit for contralesional stimulation were tested on a series of visual search tasks. It was hypothesized that the processing of single features is preattentive but that feature integration, necessary for the correct perception of conjunctions of features, requires attention. Ss 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. Brain-damaged Ss with a visual attention disorder exhibited an important reduction of their serial search rates for a conjunction target with contralesional displays. (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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