Figure 4.

Differences in fractional anisotropy (FA) detected by the atlas-based analysis. Colors code the ratio of Williams Syndrome (WS) / normal controls (NC) in regions with statistically significant differences. The plots contain the actual fractional anisotropy data (WS=red, controls=blue). The bar graphic shows that, in controls, the superior longitudinal fasciculus (SLF) has a higher fractional anisotropy on the left, while, in people with Williams Syndrome, fractional anisotropy is higher on the right. The plot of fractional anisotropy in the right superior longitudinal fasciculus and the corticospinal tract shows total segregation between Williams Syndrome and controls. In the right bottom corner, Williams Syndrome / control ratios of radial and axial diffusivity are shown for the areas that displayed significant fractional anisotropy differences.