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Effects of Chlorpromazine and Pentobarbital on Pattern and Number of Responses in Extinction

In a series of experiments rats were trained and subsequently extinguished under different conditions of drug administration. High doses of chlorpromazine (5 mg/kg) or pentobarbital (20 mg/kg) were administered during the first extinction session and the dose was progressively reduced to zero over 10 successive sessions. Extinction was continued until all Ss had consistent near zero responding. When compared to saline control, chlorpromazine had no effect on total extinction responding, while pentobarbital significantly reduced total extinction responding. Ss receiving both drugs had erratic runs of responding in extinction, whereas Ss receiving saline showed a normal extinction pattern. Ss receiving pentobarbital during both training and extinction had more total extinction responding than Ss receiving only pentobarbital in extinction.