Coronal (a), axial (b) and sagittal (c) views of population-averaged tract probability maps for each developmental time point overlaid on mean FA atlas.

<p>Corticospinal tracts (CST), forceps minor and major are shown, thresholded at the 0.25 probability level. The intensity of each voxel represents the proportion of tracts that pass through that voxel across the whole group. This ranges from 0 probability (tract present at this voxel in none of the subjects) to 1 (tract present at this voxel in all subjects). The maximum spatial variation across the group is represented, however information is retained on the distributions that are most conserved across the population.