Fig. 2. Structural covariance networks derived using non-negative matrix factorization (NMF).

Structural covariance networks are shown for the 14-network NMF solution. The spatial distribution of each network is indicated by loadings at each vertex in arbitrary units. Structural covariance networks include: (1) fronto-parietal; (2) insular-limbic; (3) occipital; (4) fronto-polar; (5) dorso-lateral prefrontal; (6) occipito-temporal; (7) pre-central; (8) temporal; (9) post-central; (10) temporo-polar; (11) parahippocampal-limbic; (12) cingular-post-central; (13) inferior fronto-temporal; and (14) inferior frontal networks.