Synchrony-based integration of EEG and fMRI-BOLD in cognitive state transitions
© Dees et al; licensee BioMed Central Ltd. 2007
Published: 6 July 2007
Both the BOLD signal and the low frequency EEG envelope data from left and right visual cortices show increased synchronization in the descent into sleep (stage 1; Figure 1).
It has been suggested that low frequency oscillations (< 30 Hz) in scalp-recorded EEG organize spatially disparate regions  and data further suggests that slower rhythms can entrain such high frequency activity . Recent data shows that low frequency oscillatory activity in the BOLD signal (< 1 Hz) correlates activity in functional neural networks. Based upon these data, we suggest that very low frequency oscillation (0.1 Hz) common to both EEG and BOLD fMRI can be used to link the temporal resolution of neurophysiological activity seen in EEG to the excellent spatial resolution of the BOLD signal to create a fuller picture of neural functional activity.
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