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To represent functional connectivity between brain areas, we measured resting EEG in 574 twins and their siblings and calculated the synchronization likelihood between each pair of electrodes. We applied a threshold to obtain a binary graph from which we calculated the clustering coefficient <jats:italic>C<\/jats:italic> (describing local interconnectedness) and average path length <jats:italic>L<\/jats:italic> (describing global interconnectedness) for each individual. Modeling of MZ and DZ twin and sibling resemblance indicated that across various frequency bands 46\u201389% of the individual differences in <jats:italic>C<\/jats:italic> and 37\u201362% of the individual differences in <jats:italic>L<\/jats:italic> are heritable. It is asserted that <jats:italic>C<\/jats:italic>, <jats:italic>L<\/jats:italic>, and a small\u2010world organization are viable markers of genetic differences in brain organization. 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