title: Evidence for impaired visual context processing in schizotypy with thought disorder.
abstract: Visual context processing was examined in relation to schizotypy in a large nonclinical university population. Schizotypal status was assessed with the Schizotypal Personality Questionnaire (SPQ) [Schizophr. Bull. 17 (1991) 555]. Schizotypal (n=32) and non-schizotypal (n=37) subjects were tested on a contour integration task (where context processing is necessary for good performance) and a visual size perception task (where context processing impairs accurate performance). In addition, a short form of the Thought Disorder Index (TDI) [Psychol. Assess. 5 (1993) 75] was administered to 28 schizotypal subjects. Thought disordered schizotypal subjects showed significantly impaired performance on the contour integration task but more accurate performance on the visual size perception task. These results support the hypothesis that deficits in visual context processing are the manifestation of a larger disturbance of cognitive coordination in schizotypy and schizophrenia.
authors.affiliation: Center for Computational and Cognitive Neuroscience and Department of Psychology, University of Stirling, Stirling FK 9 4 LA, UK. uhlhaas@mpih-frankfurt.mpg.de
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Uhlhaas
authors.forename: Steven M
authors.initials: SM
authors.lastname: Silverstein
authors.forename: William A
authors.initials: WA
authors.lastname: Phillips
authors.forename: Paul G
authors.initials: PG
authors.lastname: Lovell
mesh_terms: D000328:Adult; D003072:Cognition Disorders / Q000175:diagnosis* / Q000523:psychology; D003210:Concept Formation; D005260:Female; D005556:Form Perception; D006801:Humans; D008297:Male; D008960:Models, Psychological; D009483:Neuropsychological Tests; D010555:Personality Inventory; D011597:Psychomotor Performance; D012559:Schizophrenia / Q000175:diagnosis; D012565:Schizophrenic Psychology; D012569:Schizotypal Personality Disorder / Q000175:diagnosis* / Q000523:psychology*; D012858:Size Perception; D011795:Surveys and Questionnaires; D014796:Visual Perception