Figure 2.

Connectivity-based parcellation of frontal cortex resulted in five distinct clusters consistently identified across participants. These clusters should be interpreted as frontal regions segregated according to their striatal connectivity profile. The data-driven parcellation (clustering procedure) was blind to the anatomical location of the frontal voxel, yet those voxels clustered into five anatomically coherent territories. This procedure resulted in a map with anteroventral to posterodorsal gradient organized in accordance with known profiles of frontostriatal connectivity (Draganski et al., 2008). The map consisted of five clusters: a precentral cluster (black), a posterior prefrontal cluster (brown), a dorsal prefrontal cluster (red), an anterior prefrontal cluster (orange), and a ventromedial prefrontal cluster (yellow).