The DTI **data** analysis was performed using the FSL program tract-based spatial statistics. The analysis is briefly described as follows: each participant's DTI **data** were concatenated and corrected for eddy currents and motion using FMRIB's diffusion toolbox (FDT v2.0; http://fsl.fmrib.ox.ac.uk/fsl/ fslwiki/FDT), and DTIFIT was used to fit a single tensor model at each voxel of the preprocessed eddy currentcorrected diffusion weighted **data** for reconstruction of the FA maps for each subject.