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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. 2.

Fig. 2

Morphine Infusions during Pre-Escalation. Adolescents self-administered less morphine than adults. Post-hoc t-tests revealed a significant age effect on session 6 only (* p < 0.05). INSET. Total Morphine Intake during the Pre-Escalation Phase. All points or bars represent mean +/− SEM (n= 10 adolescents; n=16 adults).