Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/129920
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- Title
- Reasoning anomalies associated with delusions in schizophrenia
- Related
- Schizophrenia bulletin, Vol. 36, Issue 2, (2010), p.321-330
- DOI
- 10.1093/schbul/sbn069
- Publisher
- Oxford University Press
- Date
- 2010
- FoR/RFCD Code(s)
-
170100 Psychology
170200 Cognitive Sciences
110300 Clinical Sciences
- Author/Creator
- Langdon, Robyn
- Author/Creator
- Ward, Philip B
- Author/Creator
- Coltheart, Max
- Description
- Deluded people differ from nondeluded controls on attributional style questionnaires and probabilistic-reasoning and theory-of-mind (ToM) tasks. No study to date has examined the relations between these 3 reasoning anomalies in the same individuals so as to evaluate their functional independence and potentially inform theories of delusion formation. We did so in 35 schizophrenic patients with a history of delusions, 30 of whom were currently deluded, and 34 healthy controls. Compared with healthy controls, patients showed (a) a jumping-to-conclusions bias and a bias to overadjust when confronted with a change of evidence on probabilistic-reasoning tasks, (b) an excessive externalizing attributional bias, and (c) performance deficits on 3 ToM tasks. Probabilistic-reasoning and ToM measures correlated, while attributional-bias scores were independent of other task measures. A general proneness to delusional ideation correlated with probabilistic-reasoning and ToM measures, while externalizing bias was unrelated to the study measures of delusional ideation. Personalizing bias associated specifically with paranoia across the clinical and nonclinical participants. Findings are consistent with a common underlying mechanism in schizophrenia which contributes to the anomalies on probabilistic-reasoning and ToM tasks associated with delusions. We speculate that this mechanism is impairment of the normal capacity to inhibit “perceived reality” (the evidence of our senses), a capacity that evolved as part of the “social brain” to facilitate intersubjective communication within a shared reality.
- Description
- 10 page(s)
- Subject Keyword
- 170100 Psychology
- Subject Keyword
- 170200 Cognitive Sciences
- Subject Keyword
- 110300 Clinical Sciences
- Subject Keyword
- psychosis
- Subject Keyword
- reality distortion
- Subject Keyword
- social cognition
- Subject Keyword
- belief
- Resource Type
- journal article
- Organisation
- Macquarie University. Macquarie Centre for Cognitive Science
- Identifier
- http://hdl.handle.net/1959.14/129920
- Identifier
- ISSN:0586-7614
- Identifier
- mq-rm-2010001864
- Language
- eng
- Reviewed
