Abstract
Mouse-killing rats were allowed to pace their killing behavior by use of an operant response reinforced with mouse presentation. When tested after intervals of 1, 2, and 4 days without exposure to mice, the rats averaged more than 30 responses and kills before reaching a satiation criterion of ISmin without a response. In a 10-h session, during which responding was continuously reinforced, four rats killed 32–57 mice early in the session, then emitted occasional bursts of responses during the remainder of the session, obtaining and killing an average of 41 additional mice. These findings contradict a previous report that mouse killing by rats is easily satiated.
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