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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: Physiol Behav. 2017 Oct 19;203:18–24. doi: 10.1016/j.physbeh.2017.10.018

Figure 3.

Figure 3

(a) Percent cocaine choice during concurrent and discrete trials. EB rats chose cocaine significantly more than vehicle rats. No difference was found for concurrent trials. (b) Reinforcers earned during cocaine and food PR. EB rats earned significantly more reinforcers in cocaine PR. No difference was found for food PR. (c) Correlation between cocaine choice in discrete trials and cocaine PR, within each treatment group. A significant, positive correlation was found within the EB group but not the vehicle group. (d) Proportion of cocaine-preferring rats in concurrent and discrete trials. The EB group had significantly greater proportion of cocaine-preferring rats in concurrent and discrete trials. (e) Correlation between days to acquire cocaine self-administration and percent cocaine choice during discrete choice trials. A significant, negative correlation was found for the estradiol group but not the vehicle group. (f) Correlation between days to acquire food self-administration and percent cocaine choice during discrete choice trials. No significant correlations were found for the estradiol group or the vehicle group.