Abstract
Latency and rate of operant responding were studied as functions of drive in rats at low and at high levels of training and fish at a high level of training. In rats, latency was unrelated to drive at low training but inversely related at high training; response rate was directly related to drive at both high and low training. In fish, latency was inversely related and response rate directly related to drive at high training. Latency and rate were correlated during training in fish but not in rats.

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