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Decision processes and the slowing of simple choices in schizophrenia


Heathcote, A and Suraev, A and Curley, S and Gong, Q and Love, J and Michie, PT, Decision processes and the slowing of simple choices in schizophrenia, Journal of Abnormal Psychology, 124, (4) pp. 961-974. ISSN 0021-843X (2015) [Refereed Article]

Copyright Statement

Copyright 2015 American Psychological Association

DOI: doi:10.1037/abn0000117


Individuals diagnosed with schizophrenia have slowed response times (RT). We examined the role of decision processes in the slowing of simple choice responses. We updated Schatzís (1998) meta-analysis of deficits in speed and extend it to systematically examine the effects of schizophrenia on choice accuracy. We then report an experiment requiring decisions about motion direction, which we analyzed using an evidence accumulation model of choice, the linear ballistic accumulator (LBA; Brown & Heathcote, 2008). By simultaneously taking into account all aspects of behavior, the LBA was more sensitive to deficits than mean RT or accuracy alone. It also identified the 2 underlying causes of slowing: more cautious decisions (i.e., requiring more evidence before making a decision) and perceptual deficits. The schizophrenia group displayed strong sequential effects that were captured by the response on the previous trial affecting the relative amount of evidence required for choice in the LBA. These results illustrate that evidence accumulation models provide a sensitive tool that can be used to identify the cognitive mechanisms causing slowing in schizophrenia.

Item Details

Item Type:Refereed Article
Keywords:schizophrenia, choice response time, cognitive modeling, cognitive deficits
Research Division:Psychology
Research Group:Cognitive and computational psychology
Research Field:Decision making
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in psychology
UTAS Author:Heathcote, A (Professor Andrew Heathcote)
ID Code:107770
Year Published:2015
Web of Science® Times Cited:18
Deposited By:Psychology
Deposited On:2016-03-23
Last Modified:2017-11-06

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