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. Author manuscript; available in PMC: 2014 Oct 1.
Published in final edited form as: Psychopharmacology (Berl). 2013 May 17;229(3):515–525. doi: 10.1007/s00213-013-3135-4

Fig.3. FR2 and FR5 Cocaine Self-administration.

Fig.3

Comparison of cocaine infusions (0.5mg/kg/20μL inf) earned under (A) FR2 and (B) FR5 reinforcement schedules between GRL and PRL strains. Data are presented as mean ± SEM (FR2: n= 7 BxD31, 17 BxD38, 11 BxD42, 6 BxD68; FR5: n= 7 BxD31, 17 BxD38, 11 BxD42, 6 BxD68). Asterisks indicate significant differences between pooled PRL and GRL strains in all pairwise comparisons: * = at least p<0.05, **= at least p<0.01, ***= p<0.001