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  • Title: Specificity of the jump-to-conclusions bias in deluded patients.
    Author: Peters ER, Thornton P, Siksou L, Linney Y, MacCabe JH.
    Journal: Br J Clin Psychol; 2008 Jun; 47(Pt 2):239-44. PubMed ID: 17988432.
    Abstract:
    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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