Figure 1.

Schematic of the selection method for AF segments. Tracts shown are those for 1 control subject. Regions were automatically mapped onto all subjects, with region 1 in the white matter near Broca's territory, region 2 in the white matter near Geschwind's territory, and region 3 in the white matter near Wernicke's territory. The anterior segment was selected by choosing streamlines that passed through regions 1 and 2, but not region 3. The long segment was selected by choosing streamlines that passed through regions 1 and 3 (and which may pass through region 2 as well, but are not required to do so). The posterior segment was selected by choosing streamlines that passed through regions 2 and 3, but not region 1.