Figure 3.

Within-subject changes between day 2 and testing demonstrate unique behavioral outcomes of extinction and weak shock. (A) Ninety percent of animals in the weak-shock group and 56% of animals in the extinction group showed a decrease in responding between day 2 and testing. (B) One hundred percent of animals in the weak-shock group and 83% of animals in the extinction group showed a decrease in responding between day 2 and testing. (C) Eighty-eight percent of animals that received weak shock in the same context and 62.5% of animals that received weak shock in an alternative context showed a decrease in responding between day 2 and testing. (D) Seventy-five percent of animals that received extinction in the same context showed a decrease in responding between day 2 and testing. For the first and only time in this set of experiments, a majority of animals (57%) in the alternative group showed an increase in responding between day 2 and testing.