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The effect of noncontingent fixed- and variable-interval reinforcement upon subsequent acquisition of the fixed-interval scallop

Abstract Groups of rats received either no pretraining (Group N), pretraining with noncontingent FI-2 min. reinforcement (Group FI), or pretraining with noncontingent VI-2 min. reinforcement (Group VI) prior to learning to bar press on a FI-2 min. reinforcement schedule. The FI scallop was acquired...
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