Dopaminergic involvement in effort-based but not impulsive reward processing in smokers

Journal article


Freeman, Tom P., Morgan, Celia J. A., Brandner, Brigitta, Almahdi, Basil and Curran, H. Valerie. (2013). Dopaminergic involvement in effort-based but not impulsive reward processing in smokers. Drug and Alcohol Dependence. 130, pp. 109 - 114. https://doi.org/10.1016/j.drugalcdep.2012.10.016
AuthorsFreeman, Tom P., Morgan, Celia J. A., Brandner, Brigitta, Almahdi, Basil and Curran, H. Valerie
Abstract

Background: A reduction in reward responsivity and an increase in temporal discounting of rewards are both evident in smokers during acute abstinence compared to satiation. However, it is not yet known whether these processes can be modulated pharmacologically in smokers, other than with nicotine or tobacco. Methods: A double-blind placebo controlled crossover design assessed the effects of 0.5 mg pramipexole, a dopamine D2/D3 agonist, in smokers following 2 h of abstinence. Reward responsivity was measured using an effort-based card sorting task. Temporal discounting of monetary reward was assessed using Area Under the Curve (AUC) analysis, and affective and subjective effects were indexed. Results: On placebo, smokers showed an equivalent speed of card sorting when a financial incentive was provided compared to when it was not. Conversely, more cards were sorted under rewarded compared to non-rewarded trials after pramipexole, indicating an improvement in reward responsivity. Temporal discounting of monetary reward was not affected by pramipexole. Drug treatment also decreased positive affect and increased drowsiness. Conclusions: A single dose of pramipexole can enhance effort-based reward responsivity, but does not alter temporal discounting in smokers. These findings highlight pharmacological correlates of reward processing deficits in nicotine dependence and offer potential targets for their treatment.

Keywordsreward responsivity; effort; impulsivity; dopamine; pramipexole; smoking
Year2013
JournalDrug and Alcohol Dependence
Journal citation130, pp. 109 - 114
PublisherElsevier B.V.
ISSN0376-8716
Digital Object Identifier (DOI)https://doi.org/10.1016/j.drugalcdep.2012.10.016
Scopus EID2-s2.0-84877042490
Page range109 - 114
Publisher's version
File Access Level
Controlled
Place of publicationIreland
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