Table 1.

Mean distance traveled scores of rats given a challenge injection of 2 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)	2 mg/kg Meth	67,127	5,683
2 mg/kg Meth-Home Cage	2 mg/kg Meth	67,019	5,873
2 mg/kg Meth-Activity Chamber	2 mg/kg Meth	64,333	5,524
4 mg/kg Meth-Home Cage	2 mg/kg Meth	59,631	3,124
4 mg/kg Meth-Activity Chamber	2 mg/kg Meth	61,169	3,827
8 mg/kg Meth-Home Cage	2 mg/kg Meth	63,932	6,028
8 mg/kg Meth-Activity Chamber	2 mg/kg Meth	57,367	4,383
12 mg/kg Meth-Home Cage	2 mg/kg Meth	61,802	6,807
12 mg/kg Meth-Activity Chamber	2 mg/kg Meth	53,231	5,299

Rats had been pretreated with saline or various doses of methamphetamine in either the home cage or activity chamber on PD 19