Fig. 6

Macaque verification of hub connectivity suppression and perturbation effects. Suppressing hub connectivity in the macaque cortical network verified the result of increased modularity found in the human cerebral cortex network (Fig. 4). Throughout the critical regime modules were found to have increased intramodular synchrony when hub connectivity was suppressed pointing at the important role of hub nodes in establishing intermodular and global synchrony (a). Similar to the effects observed in the human network (Fig. 5), perturbing the internal frequencies of the hub nodes in the macaque cortical network prevented the modules from synchronizing (b). Perturbation of an equally large random set of nodes (c) or a module (d) did not keep the unperturbed part of the network from synchronizing, underlining the importance of the hub nodes in intermodular communication and integration