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Specificity of the jump-to-conclusions bias in deluded patients
Emmanuelle R Peters1, Patricia Thornton, Lea Siksou
1Department of Psychology, Kings College London, Institute of Psychiatry, London, UK. e.peters@iop.kcl.ac.uk
Objective:
To investigate the specificity of the 'jump-to-conclusions' (JTC) bias in delusions.
Methods:
Thirty-seven psychotic patients were divided into two separate groupings: (1) deluded versus non-deluded individuals and (2) individuals with and without a diagnosis of schizophrenia. Groups were compared on three reasoning tasks ('Beads' task, Wason's 2-4-6 task, and Wason's selection task).
Results:
Deluded participants had a tendency to show a JTC bias on data-gathering tasks, but no differences were found with the schizophrenia diagnosis grouping. There were no differences between any groups on tasks of general reasoning and probability judgments.
Conclusion:
The results suggest that JTC is specific to delusions rather than diagnosis, and to data gathering rather than a general deficit in reasoning.
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