Recent research used tools, such as diffusion tensor imaging and NODDI, to examine putative white matter abnormalities and its relationship to social cognition. Upon concluding the study, the results showed that schizophrenics had lower fractional anisotropy (FA) within the inferior fronto-occipital fasciculus and splenium of the corpus callosum compared to healthy controls. In contrast, the SPD group had FA in these same regions that was intermediate to and significantly different from both groups. Group differences in FA could be attributed specifically to alterations in extracellular fiber coherence.