Journal article
Focus on the positive: Computational simulations implicate asymmetrical reward prediction error signals in childhood attention-deficit/hyperactivity disorder
Brain research, Vol.1365, pp.18-34
12/13/2010
DOI: 10.1016/j.brainres.2010.09.065
PMID: 20875804
Abstract
A number of hypotheses have suggested that the principal neurological dysfunction responsible for the behavioural symptoms associated with Attention-Deficit/Hyperactive Disorder (ADHD) is likely rooted in abnormal phasic signals coded by the firing rate of midbrain dopamine neurons. We present a formal investigation of the impact atypical phasic dopamine signals have on behaviour by applying a TD(lambda) reinforcement learning model to simulations of operant conditioning tasks that have been argued to quantify the hyperactive, inattentive and impulsive behaviour associated with ADHD. The results presented here suggest that asymmetrically effective dopamine signals encoded by a punctate increase or decrease in dopamine levels provide the best account for the behaviour of children with ADHD as well as an animal model of ADHD, the spontaneously hypertensive rat (SHR). The biological sources of this asymmetry are considered, as are other computational models of ADHD. (C) 2010 Elsevier B.V. All rights reserved.
Details
- Title: Subtitle
- Focus on the positive: Computational simulations implicate asymmetrical reward prediction error signals in childhood attention-deficit/hyperactivity disorder
- Creators
- Jeffrey Cockburn - Brown UniversityClay B. Holroyd - University of Victoria
- Resource Type
- Journal article
- Publication Details
- Brain research, Vol.1365, pp.18-34
- Publisher
- Elsevier
- DOI
- 10.1016/j.brainres.2010.09.065
- PMID
- 20875804
- ISSN
- 0006-8993
- eISSN
- 1872-6240
- Number of pages
- 17
- Grant note
- 200709MOP-177760-BSB-CABA-161162 / Canadian Institutes of Health Research; Canadian Institutes of Health Research (CIHR)
- Language
- English
- Date published
- 12/13/2010
- Academic Unit
- Psychological and Brain Sciences
- Record Identifier
- 9984696752402771
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