Cognitive processing requires the ability to flexibly adjust and integrate information across large brain networks. More information is needed on how brain networks dynamically reorganize to allow such broad communication across many different brain regions in order to integrate the necessary information. Here, we use intracranial EEG to record neural activity from 12 epileptic patients while they perform a cognitive task in order to study how the broadness of communication changes across the underlying network spanning many different brain regions. The broadness of communication is characterized by functional measures of integration and segregation. Across all patients, we found significant increases in integration and decreases in segregation during cognitive processing, especially in the gamma band (50-90 Hz). Accordingly, we also found significantly higher level of global synchronization and functional connectivity during the execution of the cognitive task, again particularly in the gamma band. Furthermore, we demonstrate that these modulations in the level of communication across the network were not caused by changes in the level of the underlying oscillations as reflected by the corresponding power spectra.