The reinforcing (rewarding) effects of psychomotor stimulants (cocaine and amphetamine) depend on the mesocorticolimbic dopamine system innervating the nucleus accumbens ([Wise, 1981][1]; for review, see[Koob, 1992][2]), perhaps especially the shell subregion ([Bassareo and Di Chiara, 1997][3]).
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Everitt et al. (2002) studied this question.