Two groups of rats were trained in an avoidance situation to discriminate brightness and then received ECS 0.2 or 200 min. after reaching criterion. Error savings were significantly less in the short interval group. Four additional groups were trained to criterion on 2 successive days and were then given 25 habit reversal trials followed by ECS at delays of 0.2, 2.0, 20, and 200 min. Reversal performance on the test day was independent of the interval between reversal training and ECS but was related to acquisition on the day of original reversal training.
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