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. Author manuscript; available in PMC: 2012 Dec 4.
Published in final edited form as: Pharmacol Biochem Behav. 2008 Dec 3;92(1):164–172. doi: 10.1016/j.pbb.2008.11.009

Fig. 4.

Fig. 4

(a) Daily Morphine Infusions Under Long Access (LgAcc) Conditions. Adolescents and adults took similar amounts of morphine. INSET. Total Morphine Intake (mg/kg) Under LgAcc Conditions. (b) Percent Inappropriate Lever Presses During Self-Administration Under LgAcc Conditions. Adolescents exhibited more inappropriate presses compared to adults (main effect of age; * p < 0.05). All points or bars represent mean +/− SEM (n= 5 adolescents; n=9 adults).