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Updated: May 3, 2026
Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
Published on: August 5, 2014
The default mode network and EEG regional spectral power: a simultaneous fMRI-EEG study
Irene Neuner1, Jorge Arrubla2, Cornelius J Werner3
1Institute of Neuroscience and Medicine 4, INM 4, Forschungszentrum Jülich, Jülich, Germany ; Department of Psychiatry, Psychotherapy and Psychosomatics, RWTH Aachen University, Aachen, Germany ; JARA - BRAIN - Translational Medicine, RWTH Aachen University, Aachen, Germany.
This study links brain activity patterns measured by electroencephalography (EEG) to the default mode network (DMN) using simultaneous fMRI-EEG. Findings reveal specific EEG frequency bands correlate with DMN activity, suggesting a unique electrophysiological signature.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- Electroencephalography (EEG) frequencies are recognized as electrophysiological signatures of specific brain functions.
- The default mode network (DMN) is a crucial brain network implicated in various cognitive processes during rest.
- Understanding the electrophysiological underpinnings of the DMN is essential for deciphering its role in cognition.
Purpose of the Study:
- To investigate the relationship between the default mode network (DMN) and the power of different EEG frequency bands.
- To identify specific electrophysiological signatures associated with DMN activity during resting state.
- To explore correlations between spontaneous BOLD (Blood-Oxygen-Level-Dependent) responses within the DMN and EEG frequency power.
Main Methods:
- Simultaneous functional Magnetic Resonance Imaging (fMRI) and Electroencephalography (EEG) data acquired at 3 Tesla.
- fMRI data analyzed using Multivariate Exploratory Linear Optimized Decomposition into Independent Components (MELODIC) and dual regression.
- EEG power in alpha, beta, delta, and theta bands extracted from DMN regions using Low Resolution Electromagnetic Tomography (LORETA).
Main Results:
- A significant correlation was found between left parahippocampal gyrus BOLD response and delta-band power from the anterior cingulate cortex.
- Positive correlations observed between beta-1 and beta-2 frequency power from the posterior cingulate cortex (PCC) and supplementary motor/frontal cortex BOLD responses.
- Delta-band power within the DMN showed a strong correlation with the parahippocampal gyrus, aligning with delta frequencies' association with memory processes.
Conclusions:
- Spontaneous BOLD fluctuations within the DMN are associated with distinct EEG frequency bands, indicating a complex electrophysiological signature.
- Beta-band activity may play a role in maintaining the 'status quo' in cognitive and motor states.
- The findings support the notion that the DMN exhibits a unique electrophysiological profile, with different rhythms contributing to its diverse functions, including memory-related processes.
