Abstract
Rats were trained on a 2-lever chaining procedure with the schedule of availability of a light (S2) for pressing Bar A, and the probability of reinforcement (SR) for a response on Bar B in S2 varied systematically. The experiment, designed to provide different S2 schedules with the same SR frequency, evaluated the effects of S2 as a conditioned reinforcer independently of changes in SR frequency. Reductions in S2 frequency or SR probability in S2 decreased response rates on Bar A. The over-all rate on Bar A depended primarily on SR frequency, but the temporal pattern of responding depended on the S2 schedule. Discriminative control of responding on Bar B by S2 was related to SR probability in S2.

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