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Mean (±SE) percentage of correct responses for the four MK-801 (2.5 μg) treatment groups in Experiment 2 beginning on P26 as a function of training phase (acquisition or reversal), 12-trial blocks, and treatment. The intrahippocampal treatment groups were saline-saline (SAL-SAL: open circles), saline-MK-801 (SAL-MK: closed circles), MK-801-SAL (MK-SAL: open triangles), or MK-801-MK-801 (MK-MK: closed triangles). Dashed line at 50 percent indicates chance performance.
