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Affective modulation of external misattribution bias in source monitoring in schizophrenia

Published online by Cambridge University Press:  01 April 2008

S. G. Costafreda ,
G. Brébion ,
P. Allen ,
P. K. McGuire  and
C. H. Y. Fu
S. G. Costafreda
Affiliation:
Institute of Psychiatry, King's College London, UK
G. Brébion
Affiliation:
Institute of Psychiatry, King's College London, UK
P. Allen
Affiliation:
Institute of Psychiatry, King's College London, UK
P. K. McGuire
Affiliation:
Institute of Psychiatry, King's College London, UK
C. H. Y. Fu*
Affiliation:
Institute of Psychiatry, King's College London, UK
*
*Address for correspondence: Dr C. H. Y. Fu, Institute of Psychiatry, King's College London, 103 Denmark Hill, PO Box 74, London SE5 8AF, UK. (Email: c.fu@iop.kcl.ac.uk)
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Abstract

Background

Schizophrenic patients tend to attribute internal events to external agents, a bias that may be linked to positive symptoms. We investigated the effect of emotional valence on the cognitive bias.

Method

Male schizophrenic subjects (n=30) and an experimenter alternatively produced neutral and negative words. The subject then decided whether he or the experimenter had generated the item.

Results

External misattributions were more common than self-misattributions, and the bias was greater for patients with active hallucinations and delusions relative to patients in remission. Actively psychotic patients but not patients in remission were more likely to generate external misattributions with negative relative to neutral words.

Conclusions

Affective modulation of the externalizing cognitive bias in source monitoring is evident in patients with hallucinations and delusions.

Keywords

Affectbiasdelusionsmisattributionschizophreniasource monitoring
Type
Original Articles
Information
Psychological Medicine , Volume 38 , Issue 6 , June 2008 , pp. 821 - 824
Copyright
Copyright © Cambridge University Press 2008

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