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Title: Who “jumps to conclusions”? A comprehensive assessment of probabilistic reasoning in psychosis following traumatic brain injury (PFTBI), and comparison with TBI, schizophrenia, and nonclinical controls.
Epworth Authors: Ponsford, Jennie
Other Authors: Batty, Rachel
Francis, Andrew
Thomas, Neil
Hopwood, Malcolm
Rossell, Susan
Keywords: Traumatic Brain Injury
Psychosis Following Traumatic Brain Injury
Jumping to Conclusions
Reasoning Bias
Monash-Epworth Rehabilitation Research Centre , Epworth Hospital , Richmond , VIC , Australia
Issue Date: Jan-2016
Publisher: Taylor and Francis
Citation: Cogn Neuropsychiatry. 2016 Jan;21(1):32-44
Abstract: INTRODUCTION: The "jumping to conclusions" (JTC) bias has received significant attention in the schizophrenia and delusion literature as an important aspect of cognition characterising psychosis. The JTC bias has not been explored in psychosis following traumatic brain injury (PFTBI). METHODS: JTC was investigated in 10 patients with PFTBI using the beads task (ratios 85:15 and 60:40). Probabilistic predictions, draws-to-decision, self-rated decision confidence, and JTC bias were recorded. Responses from 10 patients with traumatic brain injury (TBI), 23 patients with schizophrenia, and 23 nonclinical controls were compared. Relationships were explored between draws-to-decision and current intelligence quotient, affective state, executive function, delusions (severity and type), and illness chronicity (duration). RESULTS: Groups were comparable on JTC measures. Delusion severity and type were not related to draws-to-decision for either trial. In the entire sample, executive function (reduced mental flexibility) was significantly related to more draws-to-decision on the 60:40 ratio trial. CONCLUSIONS: We found no evidence for an elevated JTC bias in patients with PFTBI or TBI alone. The influence of executive dysfunction should be considered by future studies using the beads tasks in patient populations. These findings need to be replicated in larger PFTBI and TBI samples
DOI: doi: 10.1080/13546805.2015.1127221
PubMed URL:
ISSN: 1354-6805
Journal Title: Cognitive Neuropsychiatry
Type: Journal Article
Affiliated Organisations: Brain and Psychological Sciences Research Centre (BPsyC) , Swinburne University of Technology , Melbourne , VIC , Australia.
Monash-Alfred Psychiatry Research Centre (MAPrc) , Melbourne , VIC , Australia.
Health Sciences, RMIT University , Bundoora , VIC , Australia.
Type of Clinical Study or Trial: Cohort Study
Appears in Collections:Neurosciences

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