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Correlates of alpha rhythm in functional magnetic resonance imaging and near infrared spectroscopy (2003)
| Venue: | Neuroimage |
| Citations: | 42 - 2 self |
BibTeX
@ARTICLE{Moosmann03correlatesof,
author = {Matthias Moosmann and Petra Ritter and Ina Krastel and Andrea Brink and Sebastian Thees and Felix Blankenburg and Birol Taskin and Hellmuth Obrig and Arno Villringer},
title = {Correlates of alpha rhythm in functional magnetic resonance imaging and near infrared spectroscopy},
journal = {Neuroimage},
year = {2003},
pages = {145--158}
}
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Abstract
We used simultaneous electroencephalogram-functional magnetic resonance imaging (EEG-fMRI) and EEG-near infrared spectroscopy (NIRS) to investigate whether changes of the posterior EEG alpha rhythm are correlated with changes in local cerebral blood oxygenation. Cross-correlation analysis of slowly fluctuating, spontaneous rhythms in the EEG and the fMRI signal revealed an inverse relationship between alpha activity and the fMRI-blood oxygen level dependent signal in the occipital cortex. The NIRS-EEG measurements demonstrated a positive cross-correlation in occipital cortex between alpha activity and concentration changes of deoxygenated hemoglobin, which peaked at a relative shift of about 8 s. Our data suggest that alpha activity in the occipital cortex is associated with metabolic deactivation. Mapping of spontaneously synchronizing distributed neuronal networks is thus shown to be feasible. © 2003 Elsevier Inc. All rights reserved.
Keyphrases
alpha activity occipital cortex alpha rhythm functional magnetic resonance imaging eeg-near infrared spectroscopy nirs-eeg measurement posterior eeg alpha rhythm simultaneous electroencephalogram-functional magnetic resonance imaging local cerebral blood oxygenation cross-correlation analysis relative shift metabolic deactivation positive cross-correlation deoxygenated hemoglobin neuronal network elsevier inc inverse relationship fmri signal concentration change fmri-blood oxygen level dependent signal spontaneous rhythm
