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At each point in time, the value of the HF-HRV signal (top pane) is equivalent to the power spectral density of the RR series (RR-PSD) which, in a classical approach, is calculated by integrating the Fourier-derived RR-PSD in the HF band (depicted in insets). The dynamic HF-HRV signal is synchronous with the measured BOLD signal (bottom pane).
