Figure 3.

A, Within-session schematic for Experiment 1b with noncontingent optical inhibition of IL pyramidal neurons. Illumination was provided in a random manner (i.e., unrelated to the lever presses) throughout the shortened extinction sessions. B, Noncontingent optical inhibition of the IL had no effect on within-session lever pressing during shortened extinction sessions (left) or on the retention of extinction learning (right). C, Noncontingent optical inhibition during extinction had no effect on the reinstatement of cocaine-seeking behavior. *p < 0.01 relative to extinction baseline.