Changes in heart rate during avoidance training and extinction in the cat.

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Abstract
14 freely moving cats were trained to avoid a shock by turning a wheel in response to a buzzer; heart rate (HR) was measured during acquisition and extinction. Basal HR increased on introduction of shock but gradually declined afterward. Acceleration to the buzzer (HRR) appeared before training and persisted throughout the experiment; it was augmented on shock trials and still further on avoidance trials. Significant changes in HRR in the course of training and extinction were: a drop on avoidance trials early in acquisition, a drop on nonresponse trials early in extinction, and a rise on response trials late in extinction. Results were differentially attributed to 3 factors: an acoustic reflex, general and specific skeletal activity, and fear. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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