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

Tom P Freeman, Celia J A Morgan, Brigitta Brandner, Basil Almahdi, H Valerie Curran

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalDrug and Alcohol Dependence
Volume130
Issue number1-3
Early online date19 Nov 2012
DOIs
Publication statusPublished - 1 Jun 2013

Keywords

  • Adult
  • Benzothiazoles/pharmacology
  • Cross-Over Studies
  • Double-Blind Method
  • Female
  • Humans
  • Impulsive Behavior/drug therapy
  • Male
  • Psychomotor Performance/drug effects
  • Receptors, Dopamine D1/agonists
  • Receptors, Dopamine D2/agonists
  • Reward
  • Smoking/drug therapy
  • Smoking Cessation/psychology
  • Time Factors
  • Young Adult

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