Abstract

Lever pressing by rats was maintained by food pellets delivered according to a variable-interval 1-min. schedule. Water was concurrently available. The rate of lever pressing increased, the rate of water drinking decreased, and the rate of reinforcement for lever pressing decreased when a limited-hold contingency was added to the variable-interval schedule. The data suggest that interactions between collateral responses and reinforced responses have to be considered when either response is investigated.

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