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Fig 4. Frequencies present in spontaneous BOLD fluctuations in the primary visual cortex. A, Full-field (inset) and zoomed-in power spectra of resting-state BOLD fluctuations. Spectra are computed for each subject, normalized to the unit area under the curve, and averaged across subjects. Shaded regions represent ±1 standard error of the mean as a function of frequency. B, Superimposed vascular filtering data of Fig 3B and the resting-state power spectrum from Fig 4A. Frequencies between 0.05 and 0.2 Hz are under-represented if frequency distribution of spontaneous BOLD fluctuations arises from vascular filtering alone.
