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Rats were trained to lever-press for intracranial self-stimulation (ICSS) of the lateral hypothalamus on either a fixed ratio (FR) 1 or 10 schedule. Their brains were removed after a 20 min session and tissue punches taken from the nucleus accumbens, olfactory tubercle, anterior striatum, or central striatum. These punches were assayed for content of dopamine (DA) and the major DA metabolite DOPAC...
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