Hemodynamic Correlates of Electrophysiological Activity in the Default Mode Network
Frontiers in Neuroscience October 4, 2019 Marco Marino, Giorgio Arcara, Camillo Porcaro et al.
Alpha oscillations (8–13 Hz) are the dominant electrophysiological rhythms during resting state and correlate more strongly than other frequency bands with blood oxygen-level dependent (BOLD) signals in default mode network (DMN) regions. Using simultaneously collected high-density EEG and fMRI data from 20 healthy volunteers at rest, the authors detected the DMN from source-reconstructed EEG data across multiple frequency bands and mapped correlations between EEG-derived DMN activity and fMRI-BOLD signals voxel by voxel. The correlation map for alpha oscillations overlapped with DMN regions more than maps for other bands did, supporting a primary role of alpha oscillations in DMN functioning. Simultaneous EEG-fMRI is suggested as a tool for investigating human brain networks.