A, Univariate VBM results showed significant correlations between GMV and phonological decoding mapped onto gray matter surface. GMV in left SPL/SMG (in red) was positively correlated with phonological decoding, whereas GMV in left PCC/PreCu (in blue) was negatively correlated with phonological decoding. B, Univariate VBM results showed significant correlations between GMV and form-sound association mapped onto gray matter surface. GMV in bilateral hippocampus, left AG and right SFG were positively correlated with form-sound association. C, Univariate VBM results showed significant correlations between GMV and naming speed mapped onto gray matter surface. GMV in the PCC/PreCu, left ACC, right TPJ, right MFG and right insula were positively correlated with naming speed. See Table 7 for abbreviations.