Journal
BEHAVIOURAL BRAIN RESEARCH
Volume 199, Issue 1, Pages 89-102Publisher
ELSEVIER
DOI: 10.1016/j.bbr.2008.09.027
Keywords
Incentive habits; Basal ganglia; Reward; Learning; Addiction; Conditioning; Self-administration; Amygdala; Behavioural control
Categories
Funding
- MRC [G9536855]
- Medical Research Council
- Wellcome Trust
- Medical Research Council [G0001354, G0001354B, G0600196] Funding Source: researchfish
- MRC [G0600196] Funding Source: UKRI
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In this review we discuss the evidence that drug addiction, defined as a maladaptive compulsive habit, results from the progressive subversion by addictive drugs of striatum-dependent operant and Pavlovian learning mechanisms that are usually involved in the control over behaviour by stimuli associated with natural reinforcement. Although mainly organized through segregated parallel cortico-striato-pallido-thalamo-cortical loops involved in motor or emotional functions, the basal ganglia, and especially the striatum, are key mediators of the modulation of behavioural responses, under the control of both action-outcome and stimulus-response mechanisms, by incentive motivational processes and Pavlovian associations. Here we suggest that protracted exposure to addictive drugs recruits serial and dopamine-dependent, striato-nigro-striatal ascending spirals from the nucleus accumbens to more dorsal regions of the striatum that underlie a shift from action-outcome to stimulus-response mechanisms in the control over drug seeking. When this progressive ventral to dorsal striatum shift is combined with drug-associated Pavlovian influences from limbic structures such as the amygdala and the orbitofrontal cortex, drug seeking behaviour becomes established as an incentive habit. This instantiation of implicit sub-cortical processing of drug-associated stimuli and instrumental responding might be a key mechanism underlying the development of compulsive drug seeking and the high vulnerability to relapse which are hallmarks of drug addiction. (C) 2008 Elsevier B.V. All rights reserved.
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