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Auditory false perceptions are mediated by psychosis risk factors.
MedLine Citation:
PMID:  21113827     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Introduction. Auditory hallucinations exist in psychotic disorders as well as the general population. Proneness to hallucinations, as measured by positive schizotypy, predicts false perceptions during an auditory signal detection task (Barkus, Stirling, Hopkins, McKie, & Lewis, 2007). Our aim was to replicate this result and extend it by examining effects of age and sex, both important demographic predictors of psychosis. Method. A sample of 76 healthy volunteers split into 15-17 years (n=46) and 19 years plus (n=30) underwent a signal detection task designed to detect propensity towards false perceptions under ambiguous auditory conditions. Scores on the Unusual Experiences subscale (UE) of the O-LIFE schizotypy scale, IQ, and a measure of working memory were also assessed. Results. We replicated our initial finding (Barkus et al., 2007): High scores on positive schizotypy were associated with false perceptions. Younger participants who scored highly on positive schizotypy reported significantly more false perceptions compared to other groups (p=.04). Older participants who had had an imaginary friend reported more false perceptions during the signal detection task (p< .01). Conclusions. Younger participants seem most vulnerable to the effects of positive schizotypal traits in terms of a signal detection deficit that underlies auditory hallucinations. Schizotypy may have greatest impact closer to the risk period for development of psychotic disorders.
Authors:
Emma Barkus; Richard Smallman; Natalie Royle; Chris Barkus; Shon Lewis; Teresa Rushe
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-11-25
Journal Detail:
Title:  Cognitive neuropsychiatry     Volume:  -     ISSN:  1464-0619     ISO Abbreviation:  Cogn Neuropsychiatry     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9713497     Medline TA:  Cogn Neuropsychiatry     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1-14     Citation Subset:  -    
Affiliation:
University of Wollongong, New South Wales, Australia.
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