Both neighborhood and family #socioeconomic status (SES) influence children’s gray matter structure & function, but what about #whitematter (WM)? What could be some mediating mechanisms? We studied these questions in 8842 children from the #ABCD Study: medrxiv.org/content/10.110… RSI assessed microstructure in 31 WM tracts. We looked at RND, which measured *directional* intracellular water & could reflect organized #myelin, and RNI, which measured *isotropic* intercellular water & could reflect #glia/neuron cell bodies. (fig adapted Burnor et al 2021)