期刊
NETWORK NEUROSCIENCE
卷 4, 期 3, 页码 658-677出版社
MIT PRESS
DOI: 10.1162/netn_a_00135
关键词
Brain connectivity; Human connectome; Concurrent EEG-fMRI; ICA
资金
- National Institutes of Health [R01MH11622601A1, R21NS10460302, R01EB022574, R01MH108467]
- Beckman Institute for Advanced Science and Technology, University of Illinois, Urbana-Champaign
- Indiana Alcohol Research Center [P60AA07611]
- European Research Council [260347]
- European Research Council (ERC) [260347] Funding Source: European Research Council (ERC)
Concurrent electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) bridge brain connectivity across timescales. During concurrent EEG-fMRI resting-state recordings, whole-brain functional connectivity (FC) strength is spatially correlated across modalities. However, cross-modal investigations have commonly remained correlational, and joint analysis of EEG-fMRI connectivity is largely unexplored. Here we investigated if there exist (spatially) independent FC networks linked between modalities. We applied the recently proposed hybrid connectivity independent component analysis (connlCA) framework to two concurrent EEG-fMRI resting-state datasets (total 40 subjects). Two robust components were found across both datasets. The first component has a uniformly distributed EEG frequency fingerprint linked mainly to intrinsic connectivity networks (ICNs) in both modalities. Conversely, the second component is sensitive to different EEG frequencies and is primarily linked to intra-ICN connectivity in fMRI but to inter-ICN connectivity in EEG. The first hybrid component suggests that connectivity dynamics within well-known ICNs span timescales, from millisecond range in all canonical frequencies of FCEEG to second range of FCfMRI. Conversely, the second component additionally exposes linked but spatially divergent neuronal processing at the two timescales. This work reveals the existence of joint spatially independent components, suggesting that parts of resting-state connectivity are co-expressed in a linked manner across EEG and fMRI over individuals.
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