SC-FC coupling framework.

The framework used to quantify nodal SC-FC coupling in the human brain. MPC was used to map networks of intracortical microstructural similarity for each cortical node. The WMC represents the extracortical excitatory projection structure, and communication models were then constructed to represent the complex process of communication. A multilinear model was constructed to examine the association of individual nodewise SC (MPC and communication models) profiles with FC profiles.

Cortical SC-FC coupling in young individuals.

(A) Spatial pattern of SC-FC coupling. (B) Spatial patterns with significant predictions (p<0.05, spin test). (C) SC-FC coupling comparisons among functional networks. The error bars represent 95% confidence intervals. (D-F) SC-FC coupling aligns with evolution expansion, myelin content and functional principal gradient. (G) Preferential contributions of cortical regions across different structural connections. Note: ***: p<0.001; **: p<0.01; *: p<0.05; n.s.: p>0.05. VIS, visual network; SM, somatomotor network; DA, dorsal attention network; VA, ventral attention network; LIM, limbic network; FP, frontoparietal network; DM, default mode network.

Aged-related changes in SC-FC coupling.

(A) Increases in whole-brain coupling with age. (B) Correlation of age with SC-FC coupling across significant regions (p<0.05, FDR corrected). (C) Comparisons of age-related changes in SC-FC coupling among functional networks. The boxes show the median and interquartile range (IQR; 25–75%), and the whiskers depict 1.5× IQR from the first or third quartile. (D-J) Correlation of age with SC-FC coupling across the VIS, SM, DA, VA, LIM, FP and DM. VIS, visual network; SM, somatomotor network; DA, dorsal attention network; VA, ventral attention network; LIM, limbic network; FP, frontoparietal network; DM, default mode network.

Encoding individual differences in intelligence using regional SC-FC coupling.

(A) Predictive accuracy of fluid, crystallized, and general intelligence composite scores. (B) Distribution of brain regions contributing to the general intelligence composite score. (C) Predictive contribution of functional networks. The boxes show the median and interquartile range (IQR; 25– 75%), and the whiskers depict the 1.5× IQR from the first or third quartile.

Association between developmental changes in SC-FC coupling and gene transcriptional profiles.

(A) The map of developmental changes (absolute value of correlation coefficients) in SC-FC coupling across 105 left brain regions (left panel), and the normalized gene transcriptional profiles containing 10,027 genes in 105 left brain regions (right panel). (B) The correlation between developmental changes in SC-FC coupling and the first PLS component from the PLS regression analysis. (C) Enriched terms of significant genes. (D) Cell type-specific expression of significant genes. Note, pspin: spin test; pfdr: FDR corrected.

Predictive significance of the communication model.

Age-related changes in MPC weight.

(A) Increases in MPC weight across the whole-brain with age. (B) Correlation of age with MPC weight across significant regions (p<0.05, FDR corrected). (C) Comparison of changes in MPC weight among functional subnetworks. The boxes show the median and interquartile range (IQR; 25–75%), and the whiskers depict 1.5× IQR from the first or third quartile. (D-J) Correlation of age with MPC weight across the VIS, SM, DA, VA, LIM, FP and DM. VIS, visual network; SM, somatomotor network; DA, dorsal attention network; VA, ventral attention network; LIM, limbic network; FP, frontoparietal network; DM, default mode network.

Age-related changes in communicability weight.

(A) Increases in communicability weight across the whole brain with age. (B) Correlation of age with communicability weight across significant regions (p<0.05, FDR corrected). (C) Comparison of changes in communicability weight among functional subnetworks. The boxes show the median and interquartile range (IQR; 25–75%), and the whiskers depict 1.5× IQR from the first or third quartile. (D-J) Correlation of age with communicability weight across the VIS, SM, DA, VA, LIM, FP and DM. VIS, visual network; SM, somatomotor network; DA, dorsal attention network; VA, ventral attention network; LIM, limbic network; FP, frontoparietal network; DM, default mode network.

Age-related changes in flow graph weight.

(A) Increases in flow graph weight across the whole brain with age. (B) Correlation of age with flow graph weight across significant regions (p<0.05, FDR corrected). (C) Flow graphs of changes in weight among functional networks. The boxes show the median and interquartile range (IQR; 25–75%), and the whiskers depict 1.5× IQR from the first or third quartile. (D-J) Correlation of age with flow graph weight across the VIS, SM, DA, VA, LIM, FP and DM. VIS, visual network; SM, somatomotor network; DA, dorsal attention network; VA, ventral attention network; LIM, limbic network; FP, frontoparietal network; DM, default mode network.

Age-related changes in the weight of the mean first-passage time.

(A) Increases in the weight of the mean first-passage time across the whole brain with age. (B) Correlation of age with mean first-passage time weight across significant regions (p<0.05, FDR corrected). (C) Comparison of changes in mean first-passage time weight among functional networks. The boxes show the median and interquartile range (IQR; 25–75%), and the whiskers depict 1.5× IQR from the first or third quartile. (D-J) Correlation of age with mean first-passage time weight across the VIS, SM, DA, VA, LIM, FP and DM. VIS, visual network; SM, somatomotor network; DA, dorsal attention network; VA, ventral attention network; LIM, limbic network; FP, frontoparietal network; DM, default mode network.

Predictive accuracy of regional SC-FC coupling across cognitive measures.

The top panel shows the predictive accuracy of regional SC-FC coupling across cognitive measures not adjusted for age, and the bottom panel shows the predictive accuracy across age-adjusted cognitive measures. Note: ***: p<0.001; **: p<0.01; *: p<0.05; n.s.: p>0.05.

Cell-specific expression in each pathway.

(A) Genes with positive weights. (B) Genes with negative weights. Note: pperm: permutation test.

Reproducibility analyses with different parcellation templates (HCPMMP).

(A) Spatial pattern of SC-FC coupling. (B) Correlation of age with SC-FC coupling. (C) Correlation of age with SC-FC coupling across significant regions (p<0.05, FDR corrected).

Reproducibility analyses with different tractography strategies.

(A) The consistency of mean SC-FC coupling between deterministic tractography and probabilistic tractography. (B) The consistency of the correlation between age and SC-FC coupling between deterministic tractography and probabilistic tractography. (C) The consistent predictive weights for the general intelligence composite score between deterministic tractography and probabilistic tractography. (D) The consistency of gene weights between deterministic tractography and probabilistic tractography.

Reproducibility analyses with split-half validation.

(A) The consistency of mean SC-FC coupling among S1, S2, and the WD. (B) The consistency of the correlation between age and SC-FC coupling among S1, S2, and the WD. (C) Consistent gene weights among S1, S2, and WD.