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Three experiments with rats examined the effects of thinning the rate of reinforcement for the alternative behavior in the resurgence paradigm. In all experiments, pressing one lever (L1) was first reinforced and then extinguished while pressing a second alternative lever (L2) was then reinforced. When L2 responding was then extinguished, L1 responses "resurged." Resurgence was always observed when L2 was reinforced on an unchanging reinforcement schedule during Phase 2. However, other rats received systematic decreases in the rate of L2 reinforcement before extinction of L2 began. Such a "thinning" procedure was predicted to reduce final resurgence by associating L1 extinction with longer and longer periods without a reinforcer. The procedure did reduce the resurgence effect observed when L2 was put on extinction (Experiment 3). However, in each experiment, thinned groups also returned to L1 responding, and continued to make L1 responses, while the reinforcement schedule for L2 was being thinned. Fine-grained analysis of behavior in time suggested that this early resurgence was not due to adventitious reinforcement of L1, occasion setting of L1 by reinforcer presentation, or the entrainment of L1 as a schedule-induced interim behavior. The results are overall consistent with the hypothesis that resurgence is a renewal effect in which extinguished L1 responding recovers when the context provided by the L2 reinforcement schedule is changed. Challenges for this view are also discussed.

Effects of thinning the rate at which the alternative behavior is reinforced on resurgence of an extinguished instrumental response.