Figure 1.

Dorsal versus ventral mPFC lesion placements. Atlas plate (modified after Swanson, 1992) and Nissl preparations of coronal sections through a similar level of the mPFC from representative sham-operated and dorsal and ventral mPFC-lesioned rats are shown. Damage from excitotoxin lesions was strongly centered in the PL and IL areas, respectively, with minor overlap. Dorsal lesions spread to involve aspects of the dorsal anterior cingulate region. cc, Corpus callosum, anterior forceps; aco, anterior commissure, olfactory limb; lot, lateral olfactory tract. Scale bar, 1 mm (applies to all).