Figure 5.

A, Within-session schematic for Experiment 2, in which IL pyramidal neurons were inhibited optically during extinction after food self-administration. As in the experiment shown in Figure 2, illumination was provided for 20 s after each unreinforced lever press during the five shortened extinction sessions. B, Optical inhibition had no effect on within-session lever pressing during shortened extinction sessions (left) or on the retention of extinction learning (right). C, IL optical inhibition during extinction had no effect on the subsequent reinstatement of food-seeking behavior. *p < 0.01 relative to extinction baseline.