(A) Cerebellar MD declined from postnatal day (P)80 to P220 (main effect of AGE: F(1,20) = 5.8, p < 0.05), and was significantly decreased by AIE treatment, relative to CONs (main effect of TREATMENT: F(1,20) = 8.6, p < 0.01). (B) Adolescent intermittent ethanol treatment significantly reduced MD in the corpus callosum, relative to CONs (main effect of TREATMENT: F(1,20) = 6.1, p < 0.05). (C) Hippocampal MD was unaffected by aging or AIE treatment. (D) Neocortex AD was unaffected by aging or AIE treatment. Depicted are means ± S.E.M. * p < 0.05, ** p < 0.01.