Figure 6

summarizes the effects of a single methylphenidate (2.5 mg/kg, i.p.) injection in animals treated chronically with MDMA or saline (see Table 1) for the HA, TD, VA, and NOS locomotor indices on experimental day 39, comparing activity counts of each MDMA treatment group to the saline group. The values are presented as the mean ± S.E.M. *p < 0.05.