The effect of Pavlovian fear CSs on water drinking by thirsty rats was studied after fear conditioning with several procedures. Forward conditioning produced typical CER suppression of drinkometer-recorded licking, but backward conditioning and other Pavlovian control procedures did not. Effective CER suppression was demonstrated after 4 conditioning trials with a 1-trial test procedure. This is apparently the most simple and rapid technique available for evaluating CER suppression of ongoing responding.
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Leaf et al. (1965) studied this question.
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