Figure 3: Total number of infusions earned during progressive ratio (PR) tests following 21 days of ShA sessions (ShA PR) and 10 days of LgA sessions (LgA PR) for the 0.05, 0.1, 0.2, and 0.5 mg/kg/infusion groups (n = 12 for 0.05 and 0.5 mg/kg/infusion groups; n = 11 for the 0.1 and 0.2 mg/kg/infusion groups). *p<0.05 compared to the 0.05, 0.1, and 0.2 mg/kg/infusion dose groups. (b) Total number of infusions obtained during the 10 days of LgA IVSA sessions for each dose of methylone tested (n=10 for 0.05 and 0.5 mg/kg/infusion groups; n = 11 for the 0.1 and 0.2 mg/kg/infusion groups).