Standard deviation image computed from the spatially normalized data from all subjects with the eight significant clusters represented: Orange - left posterior limb of internal capsule, Dark blue - right posterior limb of internal capsule, Light blue - right knee of internal capsule, Dark Red - left temporal-occipital, Yellow - left pons-medulla oblongata, Green - right pons, Magenta - right occipital, and Purple – left inferior parietal. Clusters appear in darker areas with lower standard deviation, thus representing areas with more reproducible spatial normalization.