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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.2. Acquisition of Cocaine Self-administration.

Fig.2

Comparison of cocaine infusions (0.5mg/kg/20μL inf) earned under an FR1 schedule of reinforcement between GRL and PRL strains. Open symbols indicate the average session in which acquisition criteria was reached. Grey shaded area indicates data used for analysis. Data are presented as mean ± SEM (n= 10 BxD31, 21 BxD38, 14 BxD42, 6 BxD68). Asterisks indicate significant differences between pooled PRL and GRL strains in all pairwise comparisons: * = at least p<0.05, ***= p<0.001