The interpeduncular nucleus and retention in albino rats.

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Abstract
In separate experiments, groups of rats were trained on: (a) a brightness discrimination for food reward, (b) a kinesthetic discrimination to avoid shock, and (c) an auditory shock-avoidance conditioned response. Damage to the interpeduncular nucleus (IPN) soon after learning significantly impaired retention in all situations, whereas lesions in other parts of the mesencephalon had no effect. The degree of retention loss was highly correlated with the amount of damage to the IPN. "The only possible interpretation at this time is that the IPN has some central function in the associative mechanism of the brain stem." From Psyc Abstracts 36:01:3DC29T. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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