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. Author manuscript; available in PMC: 2017 Jan 15.
Published in final edited form as: Behav Brain Res. 2015 Oct 20;297:165–179. doi: 10.1016/j.bbr.2015.10.017

Fig. 4.

Fig. 4

Active lever responses and cocaine infusions during cocaine self-administration maintenance testing under a second-order schedule (Mean ± SEM). Experiments were conducted in adult WKY, WIS, and SHR following vehicle or d-amphetamine treatment during adolescence. * p ≤ 0.05 compared to both other strains.