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Time series and spectral analysis of spontaneous BOLD signal fluctuations (a) time course at a voxel in the occipital region of one study participant; (b) corresponding Fourier spectrum. Across the applied frequency band of 0.01–0.08 Hz, the amplitude of low-frequency fluctuations (ALFF) yields 605.7 as of this voxel’s fluctuation amplitude (plotted in the green shade).
