The brain areas whose GMVs are correlated with the DB scores.

<p>A total of four brain regions show positive correlations between their GMVs and the DB scores (<i>P</i><0.05, corrected). ROIs 1–4 represent the four regions and are used as the seed regions for the rsFC analysis. Abbreviations: DB, digits backward; GMV, gray matter volume; L, left; R, right; ROI, region of interest; rsFC, resting-state functional connectivity.