Mice, partially trained to avoid footshock in a T-maze, showed enhanced retention relative to vehicle-injected mice when treated peripherally with arecoline, D-amphetamine, cholecystokinin octapeptide (CCK-8), epinephrine or naloxone. Both intra-amygdaloid and intraventricular injections of beta-endorphin resulted in amnesia. D-amphetamine and arecoline… (More)
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