Alpha rhythm in EEG is prominent in the occipital and parietal cortex under an awake brain state. Previous studies have reported strong correlations between the resting-state fMRI signals and EEG alpha power. Here, we re-examined their correlations at different time delays. We found strong positive fMRI correlations at the zero lag, which is distinct from those observed at the typical hemodynamic delay. The finding suggests that the resting-state EEG alpha modulation is likely associated with a sequential brain process starting much earlier.
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