Correlations between age of onset of deafness (AOD) in acquired deaf individuals and mean radial diffusivity (λ⟂) values in regions showing group FA differences. (a) Later, AOD is correlated (not significantly) with lower λ⟂ values in right superior temporal gyrus (STG) (r = −0.235, P = 0.084). (b) Later, AOD is correlated with lower λ⟂ values in left Heschl's gyrus (HG) (r = 0.382, P = 0.011). (c) Later, AOD is correlated with lower λ⟂ values in splenium of corpus callosum (SCC) (r = 0.351, P = 0.018). The correlations for all three clusters were significant after partialing for duration of deafness (right STG: r = −0.352, P = 0.019; left HG: r = −0.432, P = 0.005; SCC: r = −0.295, P = 0.043).