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. 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 3:

Figure 3:

Mean (±SEM) reinforcer deliveries (A, B) and time-out drug-associated lever responding (C, D) for High (A, C) and Low (B, D) Responder sub-groups. A significant difference between concentrations is indicated with *.