Abstract
A new cognitive learning task has been devised in the rat. The subjects, presented with a specific stimulus (stimulus session), must afterward (testing session) recognize this stimulus among the three presented in order to obtain their reinforcement (water). The stimulus changes randomly for each trial. Once the rule has been learned, performance remains stable and a delay of up to 30 min can be placed between stimulus session and testing session without significantly affecting performance. The length of the maximum delay is a function of the duration of the stimulus session. Such long delays allow experimental manipulation of this specific memory trace.
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