Socioeconomic status and reading skill main effects with socioeconomic status by reading skill interaction effects. (a) Main effect of SES shown in blue, interaction effect in red, clusters significant for both analyses shown in purple. Areas, left to right, include the left temporal inferior longitudinal fasciculus (ILF), left corticospinal tract, and right anterior inferior fronto-occipital fasciculus (IFOF). (b) Main effect of reading skill shown in green, interaction effect in red, clusters significant for both analyses shown in brown. Areas, left to right, include the right temporal inferior longitudinal fasciculus (ILF) and left anterior superior longitudinal fasciculus (SLF).