Delay-dependent short-term memory deficits in aged rats.
Separate groups of rats of three ages (6 month, 15 month or 24 month) were trained in a two-lever operant chamber on one of two versions of a paired-trial delayed response task involving either matching or non-matching of the choice response to a sample lever. The older rats were unimpaired in learning either version of the task during initial training with no (0 s) delay between the sample and choice responses. However, when variable 0-24 s delay intervals were introduced, the 24-month group...Expand abstract
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