A rapid assessment of stimulus properties of morphine.


The difficulty in assessing stimulus properties of drugs becomes apparent when the test drug, like morphine, carries both aversive and reinforcing effects at certain doses. Mice (ICR Crj strain) were trained in a passive avoidance conditioning using a two-compartment shuttle-box. On alternate days, morphine (3.0 mg/kg) was paired with shock in one… (More)


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