The goal of the present study was to examine the neurocognitive correlates of WM quality differences in MJ+ALC users. Previous findings showed decreased FA in frontal-parietal circuitry comprising fibers of the inferior frontal region, splenium of the corpus callosum, postcentral gyrus, and left SLF as well as areas of increased FA in three right hemisphere regions, including the cuneus region of the occipital lobe, anterior limb of the internal capsule, and arcuate portion of the SLF.