Structural covariance and maturational coupling of functional modular communities. A, Population-level functional communities based on 100 runs of a simulated annealing algorithm to maximize network modularity, at 10% connection density. B, The average functional connectivity, structural covariance, and maturational coupling, within and between the functional communities. C, The structural covariance within functional communities tested using a permutation procedure. Five thousand pseudo-modules were generated having the same number of spatially contiguous clusters as the actual modules and similar symmetry about the midline.