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Training and 7-day retention latencies in young and old rats trained on inhibitory avoidance with a 0.2 or 0.5 mA foot shock. (Left) There were no significant differences in training latencies across groups. (Right) Old rats had significantly lower 7-day retention latencies following the low intensity foot shock than did all other groups (*) ps < .05. Note that old rats exhibited maximal retention latencies after training with the higher foot shock intensity.
