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Effect of D2 dopaminergic agents on extinction acquisition. Data are consolidated for the first five CS presentations in the 5, 10, 20, and 40 massed extinction experiments, since all animals were treated the same during those presentations (n = 35–36). (A) Schema of experiment. (B) Average freezing during each presentation. Mixed ANOVA is significant for interaction, group and time (P < 0.05).
