Learned persistence at 11-12 days but not at 10-11 days in infant rats

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Abstract
In 2 experiments using milk-suckling from an anesthetized dam as the reinforcer, evidence is presented that the transitional age in rat pups for learning of persistence as a result of appetitive partial reinforcement is between 11 and 12 days of age. In Experiment I, pups 12–13 days of age showed the partial reinforcement extinction effect (PREE) whereas 10–11-day olds did not. In Experiment II, pups trained at 11–12 days and tested at Day 13 did show a PREE at Day 13 but those trained at 10–11 days did not.