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Yoked control animals do not exhibit learning of memory. Three cohorts of animals were given the yoked control procedure. (Open bars) Pre-test data; (hatched bar) post-test data. The data (█) represent the learning curve obtained by the cohort receiving the operant training procedure (procedure 3). (A) Data from the 1-hr training session; (B) 0.5- and (C) 0.25-hr training sessions.
