条件性不安が人の選択反応時間と認知閾に及ぼす効果

概要

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Two experiments were carried out to analyze the inhibitory effect of the conditioned anxiety, the latter being manipulated experimentally by means of the classical aversive discriminative conditioning. The selective reaction times and the duration thresholds were measured in Exp. I and Exp. II respectively. In Exp. II, the degree of the conditioned anxiety was controlled by the intensity of the electric shock used as UCS and the number of reinforcement trials. In both experiments GSRs were recorded as a measure of the formation of conditioning. The results were as follows; (1) A clear-cut GSR discrimination was acquired within 10 reinforcements. (2) After the 10 reinforcements, the RT to CS+ was significantly lengthened in comparison with the control level. (3) On the contrary, there was no effect of the conditioned anxiety on the duration thresholds. (4) After 30 reinforcements, significantly higher thresholds were found for CS+ than for CS-, and also the increase in thresholds for CS+ was highly correlated with the degree of conditioning, i.e. the intensity of UCS.
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