Skip to main content
. Author manuscript; available in PMC: 2021 Dec 1.
Published in final edited form as: Pharmacol Biochem Behav. 2020 Oct 24;199:173061. doi: 10.1016/j.pbb.2020.173061

Figure 2:

Figure 2:

Mean (N=16; ±SEM) A) reinforcers obtained (30 sec epochs of vapor delivery), and B) lever discrimination ratios exhibited, for one-hour heroin vapor self-administration sessions in female rats. Data are presented for High and Low responder sub-groups in panels C and D. Significant differences between HR and LR groups are indicated by *. Significant differences from session 1 and session 2 are indicated by # and &, respectively.