Impulsivity in disorders of food and drug misuse

Mole, T B, Irvine, M A, Worbe, Y, Collins, P, Mitchell, S P, Bolton, S, Harrison, N A, Robbins, T W and Voon, V (2015) Impulsivity in disorders of food and drug misuse. Psychological Medicine, 45 (4). pp. 771-782. ISSN 0033-2917

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Abstract

Background. Evidence suggests some overlap between the pathological use of food and drugs, yet how impulsivity
compares across these different clinical disorders remains unclear. Substance use disorders are commonly characterized by elevated impulsivity, and impulsivity subtypes may show commonalities and differences in various conditions. We hypothesized that obese subjects with binge-eating disorder (BED) and abstinent alcohol-dependent cohorts would have relatively more impulsive profiles compared to obese subjects without BED. We also predicted decision impulsivity impairment in obesity with and without BED.
Method. Thirty obese subjects with BED, 30 without BED and 30 abstinent alcohol-dependent subjects and age- and
gender-matched controls were tested on delay discounting (preference for a smaller immediate reward over a larger
delayed reward), reflection impulsivity (rapid decision making prior to evidence accumulation) and motor response
inhibition (action cancellation of a prepotent response).
Results. All three groups had greater delay discounting relative to healthy volunteers. Both obese subjects without BED and alcohol-dependent subjects had impaired motor response inhibition. Only obese subjects without BED had impaired integration of available information to optimize outcomes over later trials with a cost condition.
Conclusions. Delay discounting appears to be a common core impairment across disorders of food and drug intake.
Unexpectedly, obese subjects without BED showed greater impulsivity than obese subjects with BED. We highlight
the dissociability and heterogeneity of impulsivity subtypes and add to the understanding of neurocognitive profiles across disorders involving food and drugs. Our results have therapeutic implications suggesting that disorder-specific patterns of impulsivity could be targeted.

Item Type: Article
Schools and Departments: Brighton and Sussex Medical School > Neuroscience
Subjects: R Medicine > RC Internal medicine > RC0321 Neurosciences. Biological psychiatry. Neuropsychiatry
Depositing User: Jonathan Williams
Date Deposited: 13 Aug 2015 12:55
Last Modified: 29 Jul 2017 04:36
URI: http://sro.sussex.ac.uk/id/eprint/56098

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