EFFECTS OF DIAZEPAM, MEPROBAMATE, CHLORPROMAZINE AND APOMORPHINE ON A QUICKLY LEARNED CONDITIONED SUPPRESSION IN MICE

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Mice exhibited a marked suppression of motor activity when placed into the same environment in which they had previously received electric foot shocks. Apomorphine-HCl (0.1-10 mg/kg) produced a dose-dependent reduction of the conditioned suppression of activity, but did not increase activity in non-shocked mice. Diazepam (0.2, 1, and 5 mg/kg), meprobamate (25 and 50 mg/kg), and chlorpromazine-HCl (2 and 5 mg/kg) did not reduce conditioned suppression. Thus, the conditioned suppression caused by a quick conditioning technique does not produce similar results to those using the conditioned emotional response involving suppression of operant lever-pressing behavior.