These experiments assessed (a) the Partial Reinforcement Effect (PRE) when extinction was measured by the perseverative behavior following the blocking of a learned maze route and (b) the effects of two conditions of partial extinction on the same perseverative behavior. Initial training of the rat Ss varied in both number of trials and reinforcement schedule. Perseverative behavior was evaluated by recording cumulative errors. The results indicated that the perseverative behavior increased with an increase in the number of training trials. Perseverative behavior was also observed to be greatest following 100% rather than a ratio schedule of reinforcement, a fixed ratio resulting in greater perseveration than a variable ratio. When 10 nonreinforced trials or 10 nonreinforced goal placements followed 100% reinforced training, the perseverative behavior following blocking was reduced. These results indicate that the typical PRE which has been observed (when the extinction series includes the performance of the instrumental act) is dependent on the stimulus cues provided by the change in reinforcement schedule.
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