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Viewing strategies for simple and chimeric faces: an investigation of perceptual bias in normals and schizophrenic patients using visual scan paths

Phillips, Mary L and David, A. S. 1997. Viewing strategies for simple and chimeric faces: an investigation of perceptual bias in normals and schizophrenic patients using visual scan paths. Brain and Cognition 35 (2) , pp. 225-238. 10.1006/brcg.1997.0939

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Abstract

Left hemi-face (LHF) perceptual bias of chimeric faces in normal right-handers is well-documented. We investigated mechanisms underlying this by measuring visual scan paths in right-handed normal controls (n = 9) and schizophrenics (n = 8) for simple, full-face photographs and schematic, happy-sad chimeric faces over 5 s. Normals viewed the left side/ LHF first, more so than the right of all stimuli. Schizophrenics viewed the LHF first more than the right of stimuli for which there was a LHF choice of predominant affect. Neither group demonstrated an overall LHF perceptual bias for the chimeric stimuli. Readjustment of the initial LHF bias in controls was probably a result of increased attention to stimulus detail with scanning, whereas the schizophrenics demonstrated difficulty in redirection of the initial focus of attention. The study highlights the role of visual scan paths as a marker of normal and abnormal attentional processes.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Publisher: Elsevier
ISSN: 0278-2626
Last Modified: 27 Nov 2015 11:47
URI: http://orca.cf.ac.uk/id/eprint/81786

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