point to a diffusion tensor model via FDT (Basser et al., 1994). FA maps from each participant were submitted to Tract-Based Spatial Statistics (TBSS) (Smith et al., 2006), which involved 3 steps: (1) all datasets were nonlinearly registered and aligned to a study-specific target, which was representative of the sample under investigation, and were resampled to 1 mm3 in MNI-152 space (Evans et al., 2003); (2) a mean aligned FA image was created, from which a thresholded (FA > 0.3) skeletonized mean FA image was derived, representing white matter tracts common to all in the sample; and (3) each subject's FA values were projected onto the skeleton.
