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. Author manuscript; available in PMC: 2015 Oct 1.
Published in final edited form as: Exp Clin Psychopharmacol. 2014 Jul 7;22(5):453–459. doi: 10.1037/a0037396

Figure 1.

Figure 1

Behavior during acquisition

A) Earned infusions across acquisition for all groups (only first 25 FR5 sessions shown for rats in RED groups and excluding the initial eight dosing-error sessions). Error bars represent standard error. B) Proportion of rats in each acquisition groups that met criteria for self-administration (see text). C) The number of days to meet criteria for each acquisition group in which more than half of the rats met criteria. Only rats that were classified as meeting criteria at the end of acquisition are included.