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5 experiments investigated the source of the increased resistance to extinction of a running response occurring when rats receive no reinforcer subsequent to their initial responses. It was concluded that this source was similar to that contributing to the conventional partial reinforcement effect (PRE) but that it was not primarily attributable to habituation or to effects predicted by a proactive-interference model. Rather, the effect is a consequence of the lack of generalization decrement which otherwise facilitates rate of extinction.

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