Fig. 5.
Mean distance traveled scores (±SEM) of rats (n = 8 per group) on the test day. Rats were challenged with cocaine, METH, or NPA immediately before behavioral testing. On the pretreatment day (i.e., 24 h earlier), rats were injected with saline or SCH23390 (0.5 mg/kg) 0, 30, or 60 min before DA agonist pretreatment.
a Significantly different from the acute control group.