Region of interest analyses of the cerebellar subregions. (A) Sagittal views showing cerebellar subregions as determined by the WFU PickAtlas (Maldjian et al., 2003). In the most medial section (x = 0), the eight subregions in the vermis are shown (lobules I/II, III, IV/V, VI, VII, VIII, IX and X). The nine subregions in the hemisphere (lobules III, IV/V, VI, VIIB, VIII, IX, X, Crus I and Crus II) are shown in the lateral sections (x = −10 and x = −20). (B) Comparisons of grey matter (GM) density among the three groups in selected cerebellar subregions. Significant difference between two groups is shown by an asterisk. The y-axis represents the residual from a linear regression of age over the mean modulated grey matter density extracted from each subregion.