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A transdiagnostic investigation of ‘theory of mind’ and ‘jumping to conclusions’ in patients with persecutory delusions

Published online by Cambridge University Press:  16 November 2007

R. Corcoran ,
G. Rowse ,
R. Moore ,
N. Blackwood ,
P. Kinderman ,
R. Howard ,
S. Cummins  and
R. P. Bentall
R. Corcoran*
Affiliation:
Division of Psychiatry, School of Community Health Sciences, University of Nottingham, A Floor, South Block, Queen's Medical Centre, Nottingham, UK
G. Rowse
Affiliation:
Department of Clinical Psychology, University of Sheffield, Sheffield, UK
R. Moore
Affiliation:
Section of Old Age Psychiatry, Institute of Psychiatry, King's College London, DeCrespigny Park, London, UK
N. Blackwood
Affiliation:
Section of Old Age Psychiatry, Institute of Psychiatry, King's College London, DeCrespigny Park, London, UK
P. Kinderman
Affiliation:
Department of Clinical Psychology, University of Liverpool, Liverpool, UK
R. Howard
Affiliation:
Section of Old Age Psychiatry, Institute of Psychiatry, King's College London, DeCrespigny Park, London, UK
S. Cummins
Affiliation:
School of Psychological Sciences, University of Manchester, Oxford Road, Manchester, UK
R. P. Bentall
Affiliation:
School of Psychology, University of Wales Bangor, Bangor, Gwynedd, UK
*
*Address for correspondence: R. Corcoran, Ph.D., Division of Psychiatry, School of Community Health Sciences, University of Nottingham, A Floor, South Block, Queen's Medical Centre, Nottingham NG7 2UH, UK. (Email: [email protected])
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Abstract

Background

A tendency to make hasty decisions on probabilistic reasoning tasks and a difficulty attributing mental states to others are key cognitive features of persecutory delusions (PDs) in the context of schizophrenia. This study examines whether these same psychological anomalies characterize PDs when they present in the context of psychotic depression.

Method

Performance on measures of probabilistic reasoning and theory of mind (ToM) was examined in five subgroups differing in diagnostic category and current illness status.

Results

The tendency to draw hasty decisions in probabilistic settings and poor ToM tested using story format feature in PDs irrespective of diagnosis. Furthermore, performance on the ToM story task correlated with the degree of distress caused by and preoccupation with the current PDs in the currently deluded groups. By contrast, performance on the non-verbal ToM task appears to be more sensitive to diagnosis, as patients with schizophrenia spectrum disorders perform worse on this task than those with depression irrespective of the presence of PDs.

Conclusions

The psychological anomalies associated with PDs examined here are transdiagnostic but different measures of ToM may be more or less sensitive to indices of severity of the PDs, diagnosis and trait- or state-related cognitive effects.

Keywords

Paranoiapsychologytransdiagnostic
Type
Original Articles
Information
Psychological Medicine , Volume 38 , Issue 11 , November 2008 , pp. 1577 - 1583
Copyright
Copyright © 2007 Cambridge University Press

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