Fig. 3.
The association between RA and global brain structure, mediation analysis of the association between RA, global brain structures, and processing speed. (a) shows the significant association of RA with global brain structure (white matter volumes and cortical surface areas). (b) shows the mediating effect of global brain structure in the association of RA and processing speed. DE, direct effect; IE, indirect effect; lh, left hemisphere; Prop.med, proportion of mediation; rh, right hemisphere; RA, relative amplitude.