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The effect of stimulant and depressant drugs, affecting primarily either the CNS or the ANS, on verbal conditioning was examined. The subjects were allocated to three levels of the extraversion dimension of personality. A 5 times 3 randomized block design was replicated ten times. The sentence‐completion technique was used. The study supports the following conclusions: (1) introverted subjects are more easily conditioned than extraverted subjects; (2) dexedrine facilitates, and phenobarbitone and chlorpromazine inhibit, the conditioning process; (3) dexedrine does not improve the conditioning level of introverted subjects; (4) ephedrine does not affect the process of conditioning; (5) variability (standard deviation) tends to increase under the influence of drugs primarily affecting the CNS.
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