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However, due to the low accuracy of the current analysis methods for low frequency signal extraction of ALFF, we propose the Fourier\u2010based synchrosqueezing transform (FSST), which is often used in the field of signal processing to extract the ALFF of the low frequency power spectrum of the whole\u2010time dimension. The low frequency characteristics of the extracted signal are compared with those of FSST and fast Fourier transform (FFT) through the resting\u2010state data. 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