To gather electrophysiological evidence of time-varying functional networks, we developed a new method to analyze simultaneous fMRI and LFP data, which averages the fMRI frames at LFP power higher or lower than a threshold. The results not only show that the correlation between LFP power and BOLD is driven by a few distinct instead of a continuous interaction, but also suggests that the non-stationary resting state networks found in fMRI studies represent the time-varying behavior of LFPs.
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