Assignment of the nodal regions to the postulated cortical subsystems. The plot (3-dimensional MNI data projected to the y-z plane) illustrates the nodes of the task-sensitive connections (larger connected circles) and the reference points (smaller circles) for the postulated subsystems that support handwriting (pericentral in green, frontoparietal in blue, and perisylvian-occipital in red; see Fig. 1A,B), and points representing the “default mode” system (gray). Each connection is labeled (a–i) as in Figure 5.