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Science 13 August 2004:
Vol. 305. no. 5686, pp. 1017 - 1019
DOI: 10.1126/science.1098975
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Reports

Drug Seeking Becomes Compulsive After Prolonged Cocaine Self-Administration

Louk J. M. J. Vanderschuren*{dagger} and Barry J. Everitt

Compulsive drug use in the face of adverse consequences is a hallmark feature of addiction, yet there is little preclinical evidence demonstrating the actual progression from casual to compulsive drug use. Presentation of an aversive conditioned stimulus suppressed drug seeking in rats with limited cocaine self-administration experience, but no longer did so after an extended cocaine-taking history. In contrast, after equivalent extended sucrose experience, sucrose seeking was still suppressed by an aversive conditioned stimulus. Persistent cocaine seeking in the presence of signals of environmental adversity after a prolonged cocaine-taking history was not due to impaired fear conditioning, nor to an increase in the incentive value of cocaine, and may reflect the establishment of compulsive behavior.

Department of Experimental Psychology, University of Cambridge, Cambridge CB2 3EB, UK.



* Present address: Rudolf Magnus Institute of Neuroscience, Department of Pharmacology and Anatomy, University Medical Center Utrecht, 3584 CG Utrecht, Netherlands.

{dagger} To whom correspondence should be addressed. E-mail: l.j.m.j.vanderschuren{at}med.uu.nl

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