White matter microstructure mediates the relationship between cardiorespiratory fitness and spatial working memory in older adults. - Lauren E. Oberlin; Timothy D. Verstynen; Agnieszka Z. Burzynska; Michelle W. Voss; Ruchika Shaurya Prakash; Laura Chaddock-Heyman; Chelsea N. Wong; Jason Fanning; Elizabeth Awick; Neha P. Gothe; Siobhan M. Phillips; Emily Mailey; et al. (NeuroImage, 2016)