Figure 10.

(a) Mean (±SEM) infusions and (b) lever discrimination during acquisition for the female (N = 15) and male (N = 24) animals collapsed across adolescent treatment groups. (c) Mean (±SEM) infusions obtained during the FR dose substitution and (d) breakpoints reached in the PR dose substitution procedures are also depicted. ^* P <.05, significant difference between sexes; ^& P <.05, a significant change from the first session within group; ^# P <.05, significant difference between doses, collapsed across sex.