Abnormal visual scan paths: a psychophysiological marker of delusions in schizophrenia

Phillips, Mary L. and David, A. S. 1998. Abnormal visual scan paths: a psychophysiological marker of delusions in schizophrenia. Schizophrenia Research 29 (3) , pp. 235-245.

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Abstract

The role of the visual scan path as a psychophysiological marker of visual attention has been highlighted previously (Phillips and David, 1994). We investigated information processing in schizophrenic patients with severe delusions and again when the delusions were subsiding using visual scan path measurements. We aimed to demonstrate a specific deficit in processing human faces in deluded subjects by relating this to abnormal viewing strategies. Scan paths were measured in six deluded and five non-deluded schizophrenics (matched for medication and negative symptoms), and nine age-matched normal controls. Deluded subjects had abnormal scan paths in a recognition task, fixating non-feature areas significantly more than controls, but were equally accurate. Re-testing after improvement in delusional conviction revealed fewer group differences. The results suggest state-dependent abnormal information processing in schizophrenics when deluded, with reliance on less-salient visual information for decision-making.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine
Subjects:	R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Publisher:	Elsevier
ISSN:	0920-9964
Last Modified:	27 Nov 2015 11:02
URI:	https://orca.cardiff.ac.uk/id/eprint/81739

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