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Fourier power does not directly reflect a signal's rhythmicity, but lagged coherence does. A: waveforms can vary in their amplitude and rhythmicity. Waveforms a and b have the same rhythmicity and only differ in their amplitude, whereas waveforms b and c have the same Fourier amplitude at 10 Hz, but differ in their rhythmicity. B: Fourier power spectra for signals a, b, and c. C: lagged coherence spectra for signals a, b, and c.
