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Reduced spontaneous activity in rats treated with a neurotoxic regimen of MA. MA (10 mg/kg, i.p.) or the vehicle (VEH) was administered every 2 hr for a total of four injections. After 7 d, rats were placed in activity chambers and monitored for a 1 hr habituation period. *Indicates values that differ significantly from those of the vehicle-treated controls (p < 0.05).
