Fig. 2.

Topographical orientation. Left hemisphere indicates Brodmann area (Brodmann 1909) and cortical masks for cortex parcellation (Desikan/Killiany; Desikan et al. 2006) that were used to identify cortical projection fields. Magenta, superior-frontal gyrus; cyan, caudal middle-frontal gyrus; blue: precentral gyrus; yellow, postcentral gyrus. Right hemisphere indicates a functional subdivision of Brodmann area 6 based on a probabilistic mapping approach (Human Motor Area Template; Mayka et al. 2006). Green, supplementary motor area (SMA); orange, pre-supplementary motor area (pre-SMA); red, dorsal premotor cortex (dPMC)