Mean Diffusivity (MD) CON < PDD PD < PDD AD < PDD PD < AD   Left Right Left Right Left Right Left Right Anterior Thalamic Radiation ■ ■ ■ ■ ♦ ♦ - - Corticospinal Tract ■ ♦ ■ ■ ♦ ♦ - - Forceps Major ■ ■ - - ♦ ♦ ■ - Forceps Minor ♦ ♦ ♦ ♦ ■ ■ ■ ■ Inferior fronto-occipital fasciculus ♦ ♦ ♦ ♦ ♦ ♦ - - Inferior longitudinal fasciculus - - ♦ ■ ♦ ♦ - - Superior longitudinal fasciculus ♦ ♦ ♦ ♦ ♦ ♦ - - Uncinate fasciculus ♦ ♦ ♦ ■ ♦ ■ ■ - Cingulum (hippocampus) - - - ■ - ■ - - Cingulum (cingulate gyrus) ■ - - - - - - - ■ denotes p<0.05. ♦ denotes p<0.01

Table 3: TBSS mean diffusivity significant results for each group comparison on each probabilistic tract. Results were divided between left and right hemisphere. CON vs. AD andCON vs. PD did not show any significant differences and thus they were omitted from the table.

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