Differential effects of localized lesions of n. accumbens on morphine− and amphetamine-induced locomotor hyperactivity in the C57BL/6J mouse

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In 2 experiments with 46 C57BL/6J mice, it was found that Ss became hyperactive to increasing doses of morphine sulfate. This response was similar to locomotor hyperactivity induced by amphetamine. Lesions and chemical blockade of posterior nucleus accumbens abolished amphetamine-induced hyperactivity and reduced but did not abolish the morphine response. Results demonstrate that response to the drugs is mediated by overlapping but noncongruent neural systems. (18 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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