YeoetalJNeurophysiol2011Somatomotoravi

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The intrinsic functional connectivity networks of human motor and somatosensory cortices are displayed for a 4-mm seed region that is gradually moved along the surface. The functional connectivity networks are estimated on the surface using resting-state functional MRI data from 1000 young adults. The seed region begins in the primary motor representation near the hand area. Note that the hand motor region is defined by strong local coupling including to the topographically matched regions of somatosensory cortex but largely lacks functional coupling to other distributed cortical regions. The transition between motor cortex and premotor cortex is evident as the seed region moves into a region at or near putative FEF. Unlike primary motor cortex, FEF is functional coupled to a distributed network that includes parietal association cortex. When the seed region moves along the lateral extent of motor cortex, clear topographic organization is observed with a marked transition between motor cortex near the face representation and cortex near the hand representation. The somatomotor cortex near the face representation also exhibits stronger interhemispheric coupling compared with the motor cortex near the hand / foot representations. The borders reflect estimates of networks from the 17-network parcellation of Yeo et al. (2011; see Figure 13). Histological estimates of motor areas can be found in Figure 19 in relation to the estimated functional networks, and details of the functional topography of somatomotor cortex are quantified in Figures 20 and 21. • • The data are from: • • Yeo BT, Krienen FM, Sepulcre J, Sabuncu MR, Lashkari D, Hollinshead M, Roffman JL, Smoller JW, Zollei L., Polimeni JR, Fischl B, Liu H, Buckner RL (2011) The organization of the human cerebral cortex estimated by functional connectivity. J. Neurophysiol. • • The paper can be downloaded from PubMed here: • • http://www.ncbi.nlm.nih.gov/pubmed/21... • • The surface parcellations can be viewed using Webcaret here: • • http://sumsdb.wustl.edu:8081/sums/dir... • • YeoBT2011JNeurophysiol

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