Hemispheric differences in gray matter volume (%TIV) of motor and cognitive regions of the cerebellum (YA: black bars; OA: gray bars). The three-way repeated measures age by hemisphere by region interaction was nearly significant when using a Greenhouse-Geiser correction for sphericity (F(1.51, 78.39)=3.02, p=.068). We further conducted follow-up analyses to investigate the effect of hemisphere on the motor and cognitive regions. These analyses indicate significant effects of hemisphere for all three regions (in all cases, F(1,52)>8, p<.005), and are indicated with an asterisk. Error bars represent the standard error of the mean.