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Anti psychotic drug effects on the behavior of squirrel monkeys saimiri sciureus differentially controlled by noxious stimuli


, : Anti psychotic drug effects on the behavior of squirrel monkeys saimiri sciureus differentially controlled by noxious stimuli. Psychopharmacology 77(1): 1-6

The effects of several antipsychotic compounds were examined on 2 types of behavioral performances of squirrel monkeys. Both behaviors occurred simultaneously and were maintained separately by different schedules using noxious stimuli. Steady rates of responding were maintained when a chain pulling response postponed electric shock delivery (avoidance schedule). Concurrently, positively accelerated rates of responding were maintained on a lever where the 1st response after 3 min produced electric shock (fixed-interval 3 min schedule). The effects of the different drugs depended both upon whether the behavior postponed or presented shock and on the particular drug. Chlorpromazine (0.001-0.03 mg/kg), haloperidol (0.001-0.01 mg/kg), molindone (0.001-0.03 mg/kg) and thiothixene (0.001-0.03 mg/kg) increased slightly or had no effect on responding under the shock-postponement schedule at doses that decreased responding maintained by shock presentation. The effects of clozapine, a clinically effective antipsychotic compound, differed markedly from the other antipsychotic drugs. Clozapine (0.01-1.0 mg/kg) increased responding maintained by the presentation of shock at doses that decreased responding under the shock-postponement schedule. Higher doses of these drugs decreased responding under both schedules and, with the exception of clozapine, resulted in increased frequency of shocks under the postponement schedule.

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