Figure 1.

Study outline. First, diffusion weighted images were preprocessed with subject-motion, Eddy current distortion, and bias field correction. Fiber orientation distributions were calculated with constrained-spherical deconvolution and the directionally-encoded colors were obtained. The precentral gyrus was delineated using the T1 and defined as the seed region of interest (ROI). The other inclusion ROIs were selected in the directionally-encoded colors sequence based on the described trajectory of the motor CST. The posterior half of the posterior limb of the internal capsule and the posterolateral third of the cerebral peduncle (white arrows).