Figure 2.

Mean (±SEM) OR (A) and food cup response (B) during extinction. Orienters and Nonorienters refer to the animals that showed robust and no conditioned orienting, respectively, during conditioning phase. Ret refers to the extinction condition, in which a single CS was presented prior to regular extinction trials while No Ret refers to the regular extinction trials without a prior CS presentation. Orienters showed more OR than Nonorienters (A). There was no difference in food-cup responding among four groups, and all showed comparable extinction rates (B).