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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: Behav Pharmacol. 2011 Feb;22(1):14–22. doi: 10.1097/FBP.0b013e3283423d92

Figure 2.

Figure 2

Cross substitution of dl-MPH and d-MPH in mice trained to discriminate 5 mg/kg dl-MPH (n = 7) or 2.5 mg/kg d-MPH (n = 6).. The same mice shown in Figure 2 were used to test whether dl-MPH and d-MPH would substitute in mice trained to discriminate the other form. Essentially, the data show that equivalent doses of either compound (based on the d-isomer) directly substitute for the other compound as anticipated. The data indicate that the presence of the l-isomer does not appear to contribute to the discriminative cue of dl-MPH. Values are means ± S.E.M.