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Analysis of TTC and error types during reversal for P26 rats as a function of dose of MK-801 in Experiment 2. Differences were not found between a first (SAL–MK) or second (MK–MK) infusion of MK-801 during reversal. Mean (± SE) for TTC (A), total errors (B), perseverative errors (C), and regressive errors (D). See text for further explanation.
