Abstract
Rats were first trained to respond on either chain or response lever (R1) and then were switched to the alternate operandum (R2). In the first of two experiments it was found that Ss given training on a fixed-interval schedule of reinforcement on Rl subsequently acquired the fixed-interval “scallop” pattern of responding on R2 more rapidly than they had on R1. In the second experiment a pronounced fixed-interval scallop developed more rapidly on R2 in the presence of a stimulus previously correlated with a fixed-interval schedule than one previously correlated with a variable-interval schedule of reinforcement for R1. The results were discussed in relation to respondent mediation, operant mediation, and nonmediational theories of fixed-interval responding.
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