Table 2.

Mean distance traveled scores of rats given a challenge injection of 1, 4, or 8 mg/kg methamphetamine (Meth) 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)	1 mg/kg Meth	44,387	6,343
4 mg/kg Meth-Home Cage	1 mg/kg Meth	38,767	6,873
4 mg/kg Meth-Activity Chamber	1 mg/kg Meth	45,110	4,603
Saline only (acute controls)	4 mg/kg Meth	50,627	3,612
4 mg/kg Meth-Home Cage	4 mg/kg Meth	59,719	4,329
4 mg/kg Meth-Activity Chamber	4 mg/kg Meth	43,168	4,626
Saline only (acute controls)	8 mg/kg Meth	33,596	3,186
4 mg/kg Meth-Home Cage	8 mg/kg Meth	38,220	4,586
4 mg/kg Meth-Activity Chamber	8 mg/kg Meth	31,496	2,561

Rats had been pretreated with saline or 4 mg/kg methamphetamine in either the home cage or activity chamber on PD 19