Figure 3. Fos expression in the patch and matrix compartments of the dorsolateral caudate-putamen as a function of pretreatment, challenge, and bregma level.

Left panels (a and c), Fos expression across rostral-caudal levels. Right panels (b and d), Fos expression collapsed across levels. Asterisk denotes significant interaction between pretreatment and challenge (values = Mean±SEM).