Abstract
Rats of four age groups: young (30 days of age), adolescent (180 days of age), adult (365 days of age), and old (547 days of age) were trained on active and passive avoidance tasks. There was impaired acquisition and 30-day rentention of passive-avoidance learning in both young and old rats, compared to the intermediate age groups, and marked impairment of acquisition and retention of active-avoidance learning in the old rats. Learning impairment is thus associated with immaturity as well as senescence.
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