Table 1.

Locations of seed regions used to quantify specificity of somatomotor networks

Left CoordinatesRight Coordinates
Cerebral Cortex
    M1F−6, −26, 766, −26, 76
    M1H−41, −20, 6241, −20, 62
    M1T−55, −4, 2655, −4, 26
    S1F−10, −42, 7410, −42, 74
    S1H−42, −35, 6542, −35, 65
    S1T−64, −8, 2764, −8, 27
    FEF−26, −6, 4826, −6, 48
    PrCv−50, 6, 3050, 6, 30
Cerebellum
    Foot−17, −33, −2614, −34, −26
    Hand−20, −52, −2417, −52, −24
    Tongue−18, −61, −2116, −61, −22
  • Coordinates represent x, y, z in the atlas space of the Montreal Neurological Institute (MNI). Motor task functional magnetic resonance imaging (fMRI) together with probabilistic histological maps of areas 2 and 4 (Geyer et al. 1996; Grefkes et al. 2001; Fischl et al. 2008) were used to identify M1F, M1H, M1T, S1F, S1H, and S1T in the left hemispheres (where subscripts F, H, and T indicate foot, hand, and tongue representations) and were reflected across the midline in MNI space to obtain seed regions in the right hemisphere. Motor task fMRI was also used to identify motor seed regions in the right cerebellum. Left frontal eye field (FEF) and ventral precentral cortex (PrCv) seed regions were obtained from Yeo et al. (2011). Contralateral cerebellar seed regions were obtained by reflection across the midline in the native FreeSurfer volume space, leading to asymmetric MNI atlas coordinates in some instances.