Mice were treated with vehicle or METH (1 mg/Kg, sc, once a day for 7 days), and on withdrawal were placed in an open-top arena in a 5 min habituation session for 3 consecutive days. A) Locomotion, *: Day 1 different from Day 2 and Day 3 (p<0.05). B) Time in center, *: vehicle different from METH in Day 2. Exploratory activity during METH withdrawal was evaluated using Ethovision XT 7.0 tracking software (Noldus, Leesburg, Virginia). Repeated measures two-way ANOVA - Bonferroni. Values indicate mean ± SEM (N=8–9),