Table 4.

Mean distance traveled scores of rats given a challenge injection of 2.5, 5, or 7.5 mg/kg methylphenidate (MPH) before the 180-min testing session on PD 21

Treatment condition		Distance traveled (cm)
Pretreatment day (PD 19)	Test Day (PD 21)	Mean	SEM
Saline only (acute controls)	2.5 mg/kg MPH	31,639	3,608
10 mg/kg MPH-Home Cage	2.5 mg/kg MPH	25,637	3,520
10 mg/kg MPH-Activity Chamber	2.5 mg/kg MPH	31,654	2,833
Saline only (acute controls)	5 mg/kg MPH	46,636	5,034
10 mg/kg MPH-Home Cage	5 mg/kg MPH	43,801	2,431
10 mg/kg MPH-Activity Chamber	5 mg/kg MPH	42,965	4,471
Saline only (acute controls)	7.5 mg/kg MPH	60,010	5,576
10 mg/kg MPH-Home Cage	7.5 mg/kg MPH	59,987	6,803
10 mg/kg MPH-Activity Chamber	7.5 mg/kg MPH	50,184	4,859

Rats had been pretreated with saline or 10 mg/kg methylphenidate in either the home cage or activity chamber on PD 19