Abstract
Twelve rats were tested through a series of 33 daily reversals of a light/tone successive discrimination; training was halted for 1 month and then resumed for six sessions. For the test session, the first one when training resumed, six rats relearned the last discrimination (the same correct stimulus on Sessions 33 and 34), but the other six rats learned the reversed discrimination (different correct stimuli on Sessions 33 and 34). The rats in the nonreversed group learned the test discrimination faster than the discrimination on Session 33, so they must have remembered the correct stimulus from Session 33, demonstrating a well established memory for the last correct stimulus in a series of discrimination reversals.
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