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Neural interactions occur on different levels and scales. It is of particularimportance to understand how they are distributed among differentneuroanatomical and physiological relevant brain regions. We investigatedneural cross-frequency couplings between different brain regions according tothe Desikan-Killiany brain parcellation. The adaptive dynamic Bayesianinference method was applied to EEG measurements of healthy resting subjects inorder to reconstruct the coupling functions. It was found that even afteraveraging over all subjects, the mean coupling function showed a characteristicwaveform, confirming the direct influence of the delta-phase on the alpha-phasedynamics in certain brain regions and that the shape of the coupling functionchanges for different regions. While the averaged coupling function within aregion was of similar form, the region-averaged coupling function was averagedout, which implies that there is a common dependence within separate regionsacross the subjects. It was also found that for certain regions the influenceof delta on alpha oscillations is more pronounced and that oscillations thatinfluence other are more evenly distributed across brain regions than theinfluenced oscillations. When presenting the information on brain lobes, it wasshown that the influence of delta emanating from the brain as a whole isgreatest on the alpha oscillations of the cingulate frontal lobe, and at thesame time the influence of delta from the cingulate parietal brain lobe isgreatest on the alpha oscillations of the whole brain.

Delta-alpha cross-frequency coupling for different brain regions