Role of the lateral prefrontal cortex in visual object-based selective attention |
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Authors: | Scott Sinnett Janice J Snyder and Alan Kingstone |
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Institution: | (1) Department of Psychology, University of Hawaii at Manoa, 2430 Campus Road, Gartley Hall 110, Honolulu, HI 96822-2294, USA;(2) University of British Columbia Okanagan, Kelowna, BC, Canada;(3) University of British Columbia, Vancouver, BC, Canada |
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Abstract: | We demonstrate that attention to object representations is vitally dependent on the prefrontal cortex. Object-based selective
attention was compared in neurologic patients with unilateral damage to either the dorsolateral prefrontal cortex (DLPFC)
or the parietal cortex and in healthy controls. Our task required a top–down attentional modulation of object representations
in which spatial location played no role. All groups could invoke top–down object-based selection, but the DLPFC patients
showed a selective deficit when target stimuli were in the hemifield contralateral to the lesioned hemisphere. Our findings
indicate that in the healthy brain, anterior cortical mechanisms are crucial for attending to object-centered representations,
whereas posterior cortical mechanisms are necessary for attending to objects at locations in the visual scene.
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Keywords: | Neurologic focal brain lesion patients Prefrontal cortex Parietal cortex Object-based attention |
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