Figure 5.

Within-individual variation in “symmetry” indices of the left versus right precentral (A) and postcentral (B) areas. For the precentral area, the within-individual index over time was consistently positive (subject 5T), indicating a larger thickness on the left side, or was mixed small positive and negative (subjects 1R, 2G, 3L, and 4E), suggesting a consistent small variation around a symmetrical relationship. For the postcentral area, the within-individual indices over time were consistently positive (1R, 5T) or negative (3L, 4E), indicating a larger thickness on the respective left and right sides, or were mixed small positive and negative (2G), suggesting a consistent small variation around a symmetrical relationship. Within each subject, the symmetry arrangements of the pre- and postcentral areas, when considered together, consistently matched (5T, 2G) or differed (1R, 3L, 4E) over time (see Results). Scans as described in Figure 4. Subjects 1R, 2G, 3L, and 4E were right handed and subject 5T was left handed (Edinburgh handedness inventory).