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Differential vulnerability to the punishment of cocaine related behaviours: effects of locus of punishment, cocaine taking history and alternative reinforcer availability.


Type

Article

Change log

Authors

Pelloux, Yann 
Murray, Jennifer E 
Everitt, Barry J 

Abstract

BACKGROUND: The availability of alternative reinforcement has been shown to reduce drug use, but it remains unclear whether it facilitates a reduction or cessation of drug seeking or taking. OBJECTIVES: We compared the effects of punishment of cocaine seeking or taking behaviour after brief or extended cocaine-taking histories when behavioural reallocation was facilitated or not by making available an alternative ingestive reinforcer (sucrose). METHODS: In the first experiment, punishment of either seeking or taking responses was introduced immediately after training on the seeking-taking chained schedule. In the second experiment, punishment of cocaine seeking was introduced after 12 additional days of either 1 or 6 h daily access to cocaine self-administration. In both experiments, beginning 1 week before the introduction of punishment, a subset of rats had concurrent nose poke access to sucrose while seeking or taking cocaine. RESULTS: The presence of an alternative source of reinforcement markedly facilitated behavioural reallocation from punished cocaine taking after acquisition. It also facilitated punishment-induced suppression of cocaine seeking after an extensive cocaine self-administration history likely by prompting goal-directed motivational control over drug use. However, a significant proportion of rats were deemed compulsive-maintaining drug use after an extensive cocaine history despite the presence of abstinence-promoting positive and negative incentives. CONCLUSION: Making available an alternative reinforcer facilitates disengagement from punished cocaine use through at least two different processes but remains ineffective in a subpopulation of vulnerable animals, which continued to seek cocaine despite the aversive consequence of punishment and the presence of the alternative positive reinforcer.

Description

Keywords

Animals, Cocaine, Cocaine-Related Disorders, Conditioning, Operant, Drug-Seeking Behavior, Male, Motivation, Punishment, Rats, Reinforcement, Psychology, Self Administration, Sucrose

Journal Title

Psychopharmacology (Berl)

Conference Name

Journal ISSN

0033-3158
1432-2072

Volume Title

Publisher

Springer Science and Business Media LLC
Sponsorship
Medical Research Council (G1002231)
Medical Research Council (G0001354)
This work was supported by the United Kingdom Medical Research Council (MRC) Grant to BJE (G9536855) and was conducted within the MRC/Wellcome Trust Behavioural and Clinical Neuroscience Institute. The authors declare no conflicts of interest.