Figure 4.

Profile of DA efflux in the rat PFC during the different phases of the behavioral test. a, Changes in PFC DA levels in untrained rats during baseline (white circles), in the waiting cage (w; gray circles), during the task (t; black circles), and again in the home cage (white circles). b, Changes in PFC DA levels in rats trained to alternate in the T-maze. Circles are as in a. The abscissa represents the number of 10 min dialysate samples. Points are means ± SEM of nine animals per group. ^*p < 0.05 versus the average of the four baseline values (Dunnett's multiple-comparison test).