Figure1.

a shows the subdivisions of the prefrontal cortex as specified by a coronal delimiting plane corresponding to the most anterior extent of the genu of the corpus callosum and three axial planes coincident with or parallel to a line passing through the anterior and posterior commissures. Each axial plane was determined at the same location for each participant after fitting the Talairach proportional grid system (Talairach, 1988) to a positionally normalized 3D dataset (D, dorsal; MS, middle-superior; MI, middle-inferior; O, orbital). b shows the four measured segments of the cingulate gyrus. Similar to the prefrontal components, cingulate subdivisions were determined for each participant from coronal planes corresponding to specific Talairach atlas landmarks (VA, ventral anterior; DA, dorsal anterior; M, middle; P, posterior).