Jumping to delusions in early psychosis

Langdon, Robyn, Still, Megan, Connors, Michael H., Ward, Philip B. and Catts, Stanley V. (2014) Jumping to delusions in early psychosis. Cognitive Neuropsychiatry, 19 3: 241-256. doi:10.1080/13546805.2013.854198


Author Langdon, Robyn
Still, Megan
Connors, Michael H.
Ward, Philip B.
Catts, Stanley V.
Title Jumping to delusions in early psychosis
Journal name Cognitive Neuropsychiatry   Check publisher's open access policy
ISSN 1354-6805
1464-0619
Publication date 2014-05-04
Year available 2013
Sub-type Article (original research)
DOI 10.1080/13546805.2013.854198
Open Access Status
Volume 19
Issue 3
Start page 241
End page 256
Total pages 16
Place of publication Abingdon, Oxon, United Kingdom
Publisher Routledge
Collection year 2014
Language eng
Subject 2738 Psychiatry and Mental health
2805 Cognitive Neuroscience
Abstract IntroductionPatients with delusions typically seek less information when making decisions than controls ("jumping-to-conclusions", JTC) and paradoxically over-adjust to counter-evidence on probabilistic reasoning tasks. Previous studies have examined JTC bias across the delusion-prone continuum, but have not considered the co-occurrence of both biases at early stages of psychosis. This was our aim.MethodTwenty-three early psychosis patients and 19 healthy controls completed two versions of the probabilistic reasoning task: a "draws-to-decision" version (to assess JTC) and a "graded- estimates" version (to assess over-adjustment). Both versions have been used previously with clinically delusional people with schizophrenia. IQ, memory and executive function were also examined.ResultsPatients took fewer trials to reach a decision in the draws-to-decision version and showed greater over-adjustment to counter-evidence in the graded-estimates version than controls. Across groups, those who jumped to conclusions showed greater over-adjustment. Poor executive function predicted more extreme biases in controls but not in patients. Task performances were unrelated to memory. Similar results were evident in patient and control subgroups matched on IQ, and years of formal education.ConclusionsA jumping-to-conclusions bias and an over-adjustment bias co-occurred in the early psychosis patients. Implications are discussed concerning the role of such biases in delusion-proneness.
Keyword Early psychosis
First episode psychosis
Jumping-to-conclusions bias
Probabilistic reasoning
Schizophrenia
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Author Post-Print Permissible. 12 months embargo

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
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