THE EFFECTS OF SHOCK INTENSITY ON DISCRIMINATED REARING AVOIDANCE CONDITIONING IN RATS

概要

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Discriminated rearing avoidance conditioning was studied using a 2×2 factorial design in which the two factors were levels of shock intensity and presence or absence avoidance contingency. Two avoidance groups of rats were trained to avoid shocks by their upward movement which cut the invisible beams running at 15 cm above the floor. The other two groups were trained by signaled escape training procedure without avoidance contingency. The CS-US interval was 5 sec and a total of 300 trials were run over five days. The avoidance groups showed increase of avoidance over five days and the level of avoidance was positively related to shock intensity. The number of responses which occurred within 5 sec after the CS onset in the nonavoidance groups decreased over five days. In the high shock avoidance group, the topography of avoidance was rearing but the escape response was mostly jumping.
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