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. Author manuscript; available in PMC: 2012 Mar 1.
Published in final edited form as: Behav Brain Res. 2010 Nov 9;217(2):386–390. doi: 10.1016/j.bbr.2010.11.009

Fig. 1.

Fig. 1

Course of escalation of METH intake following extended drug availability at a dose of 0.05 mg/kg/infusion. Active lever pressing and total METH intake (mg/kg) during the different extended access sessions is presented in (A), active lever pressing and METH intake (mg/kg) during the first hour is depicted in (B). Data are expressed as means ± SEM, whereas each dot represents lever pressing and METH intake (mg/kg) at the respective time points. Differences in active lever pressing between long-term access (3, 6-h) and the last session of the short-term (1-h) access period are indicated as asterisks (ANOVA, Tukey’s post hoc t-test, p < 0.05).