Figure 3.

MRI tractography results. These group-level results (N = 7) were recorded on a Siemens Prisma and a 64-channel receiver array using a simultaneous multislice sequence with 257 directions and a grid-sampling scheme with 22 different nonzero b values ranging between 150 and 4000. The left and right M1 (red), extracted from the TMS E-fields, were here used as seeds for probabilistic tractography (left M1 as seed, right M1 as waypoint mask). The tractography result (yellow) is consistent with a major transcallosal axonal bundle connecting the left and right M1. Coronal slice at the M1 level, posterior view (anatomical left on left). [Color figure can be viewed at www.neuromodulationjournal.org]