A whole brain ANOVA revealed significant between-group FA differences in 8 separate fiber tract regions: 4 clusters in the left superior corona radiata, 1 cluster in the right inferior longitudinal fasciculus, 1 cluster in the left inferior fronto-occipital fasciculus, 1 cluster in the left middle cerebellar peduncle, and 1 cluster in the left superior longitudinal fasciculus (see Table 2 and Figure 1; clusters ≥ 27 contiguous voxels each at p<.05). Follow-up pair-wise comparisons controlling for lifetime drinking episodes indicated that BG displayed lower FA than CON in all 8 clusters (ps ≤ .016, see Table 2). BG+MJ displayed lower FA than CON in 2 of the corona radiata clusters and in the superior longitudinal fasciculus cluster (ps ≤ .01, see Table 2). Interestingly, BG demonstrated significantly lower FA than the BG+MJ group in 4 of the 8 regions: 1 of the superior corona radiata clusters, inferior fronto-occipital fasciculus, middle cerebellar peduncle, and the superior longitudinal fasciculus (ps .014 to .043). Results were unchanged when lifetime drinking episodes were not controlled for, except that BG+MJ now showed lower FA than CON
