Abstract
When odors from the home nest were paired with footshock, 12-day-old rat pups exhibited greater conditioned aversion to these odors than did 16-day-old pups. This superior performance of the younger animals was evident both at an immediate test and after retention intervals of 1 and 90 min if the subjects spent the conditioning-test delays in clean shavings. When the retention interval was spent in home shavings, only at an immediate test did the 12-day-olds display stronger aversions to the home nest odor than the 16-day-olds. Interjecting a conditioning-test delay of even 1 min in the home shavings dramatically disrupted the test performance of the younger pups.
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