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Mean distance traveled scores (±SEM) of rats injected with saline or methylphenidate (MPH; 5, 10, or 20 mg/kg, IP) before a 30-min placement in the activity chambers on the pretreatment day (i.e., PD 19). The right panel shows mean distance traveled collapsed across time blocks 1–6. *Significantly different from the saline group (P<0.05)
