Abstract
Heart rate (HR) and general activity were recorded while dogs pressed a panel for food on a differential reinforcement of low rate schedule. In Experiment 1, 2 of the 4 dogs showed an acceleration of HR prior to panel presses, while all dogs decelerated after panel presses. The magnitude of HR deceleration, however, was not different for reinforced and non-reinforced (error) responses. The same general HR pattern was observed in Experiment 2 in which the peak acceleration coincided with panel presses for two dogs and slightly afterwards for two dogs. For 3 of the 4 dogs in Experiment 2, a significant correlation was found between HR and general activity changes. While the results supported the notion that metabolic requirements generated by a particular behavioral task are a primary determinant of behaviorally induced HR changes, they failed to support Malmo's contention that HR changes reflect the reinforcement process.
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