Abstract
In Exp. I rats received a single electroconvulsive shock (ECS) while performing either an escape response or an immobile response interpolated in the training-retraining interval of an avoidance response (AR). ECS given during escape responding interfered with performance in the AR retraining situation, whereas ECS paired with the immobile response facilitated performance. In Exp. II Ss 1st received training on an active AR followed by training on a passive AR, or vice versa. A single ECS was given after the initial training. During subsequent training Ss given ECS made more ARs than control Ss. The results of both experiments support a fear-conditioning interpretation of the effects of ECS. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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