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displays the pre- versus posttraining differences between (a) the average regression scores of the first principal components based on the cognitive performance as well as between (b) average fractional anisotropy, (c) mean diffusivity, (d) axial diffusivity, and (e) radial diffusivity in segment 1 of the corpus callosum. * p ≤ 0.05, ** p ≤ 0.01.
