Effects of the mother, object play, and adult experience on predation in cats.
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Epinephrine peripherally administered to rats and mice immediately following avoidance and/or appetitive training enhances later memory retention in both young and old animals. These findings suggest a possible involvement of peripheral adrenergic systems in memory dysfunctions which accompany aging.
Rats were trained in a one-trial appetitive task using water motivation. Brain catecholamine and metabolite levels were assessed in samples collected 10 min after training. There was no evidence that brain NE levels were modified by training, although catecholamine levels increased when the animals were placed in a novel environment. These results differ from those obtained after avoidance training where the extent of a post-training decrease in brain norepinephrine predicts later retention performance.