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Updated: Jan 20, 2026
Network Analysis of the Default Mode Network Using Functional Connectivity MRI in Temporal Lobe Epilepsy
Published on: August 5, 2014
Default network and frontoparietal control network theta connectivity supports internal attention.
Julia W Y Kam1, Jack J Lin2,3, Anne-Kristin Solbakk4,5,6
1Helen Wills Neuroscience Institute, University of California - Berkeley, Berkeley, CA, USA. juliakam@berkeley.edu.
Internal attention relies on enhanced theta band connectivity between the default network (DN) and a specific part of the frontoparietal control network (FPCN_A). This finding clarifies the neural basis of inner world attention.
Area of Science:
- Cognitive Neuroscience
- Electrophysiology
- Neuroimaging
Background:
- Understanding the neural basis of inner world attention is crucial.
- Previous research implicates the default network (DN) and frontoparietal control network (FPCN), but electrophysiological interactions are unclear.
Purpose of the Study:
- To investigate the electrophysiological basis of interactions between the default network and frontoparietal control network during directed attention.
Main Methods:
- Intracranial electroencephalogram (iEEG) was recorded from DN and FPCN electrodes in epilepsy patients.
- Participants performed tasks involving externally directed attention (focusing on tones) and internally directed attention (mind-wandering).
- Theta band connectivity between DN and FPCN subsystems was analyzed.
Main Results:
- Increased theta band connectivity between the default network (DN) and FPCN subsystem A (FPCN_A) was observed during internally directed attention compared to externally directed attention.
- This enhanced connectivity positively correlated with subjective attention ratings.
- No significant difference in connectivity was found between DN and FPCN subsystem B (FPCN_B) across attention states.
Conclusions:
- Enhanced theta band connectivity between the default network and FPCN_A is a key electrophysiological mechanism underlying internally directed attention.
- These findings provide novel insights into the neural dynamics of attending to one's inner world.
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