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Learning curves for the CWM: Data are mean ± SEM total errors per day. A = total errors in the Saline and AMPH groups; B = total errors in the Saline, MA10, and MA12.5 groups; C = total errors in the Saline, MDMA, and FEN groups. Significant differences among the groups are shown in Fig. 3. Group sizes are as in Fig. 1.
