Figure 2.

Bar charts of different diffusivity indices of frontal, premotor/SMA, primary motor, primary sensory, temporal, parietal, occipital subregions of corpus callosum, and entire corpus callosum in the normal controls, amnestic mild cognitive impairment and Alzheimer's disease groups. Significant differences after Tukey's correction of post‐hoc ANCOVA test are marked with asterisks (P < 0.05). The unit of the diffusivity values (MD, DA, and DR) is 10⁻⁶ mm²/s. CC, corpus callosum; FA, fractional anisotropy; MD, mean diffusivity; DR, radial diffusivity; DA, axial diffusivity; NC, normal control; aMCI, amnesic mild cognition impairment; AD, Alzheimer disease. [Color figure can be viewed in the online issue, which is available at http://wileyonlinelibrary.com.]