Publication Type Academic Article
Authors Singh M, Kim S, Kim T
Journal Magn Reson Med
Volume 49
Issue 1
Pagination 108-14
Date Published 01/01/2003
ISSN 0740-3194
Keywords Brain Mapping, Cerebrovascular Circulation, Electroencephalography, Magnetic Resonance Imaging, Oxygen, Photic Stimulation
Abstract The correlation between signals acquired using electroencephalography (EEG) and fMRI was investigated in humans during visual stimulation. Evoked potential EEG and BOLD fMRI data were acquired independently under similar conditions from eight subjects during stimulation by a checkerboard flashed at frequencies ranging from 2-12 Hz. The results indicate highly correlated changes in the strength of the EEG signal averaged over two occipital electrodes and the BOLD signal within the occipital lobe as a function of flash frequency for 7/8 subjects (average linear correlation coefficient of 0.76). Both signals peaked at approximately 8 Hz. For one subject the correlation coefficient was 0.20; the EEG signal peaked at 6 Hz and the BOLD signal peaked at 10 Hz. Overall, the EEG and BOLD signals, each averaged over 40-sec stimulation periods, appear to be coupled linearly during visual stimulation by a flashing checkerboard.
DOI 10.1002/mrm.10335
PubMed ID 12509825
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