Abstract
Rats reared in isolated and overcrowded environments are inferior to those from small groups in complex learning tasks. To examine the age dependence of this phenomenon, adult rats isolated from weaning were placed in groups of 1, 4, and 16 for either 1 or 4 weeks. One week of grouping enhanced Lashley III maze performance, while 4 weeks’ grouping did not. One week of grouping did not affect shock avoidance brightness discrimination, but after 4 weeks, the group of 16 was superior. Hence, grouping or crowding in adulthood tends to reverse learning deficits produced by isolation rearing.
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