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Amplitude modulations in multiple frequencies of STN-LFPs during gait with the corresponding GPM values before, during, and after auditory cues. The time–frequency (TF) plot shows amplitude modulations in the STN vary across a gait cycle, 0 s aligns to the contralateral heel strikes. Diagrams on the left of TF plots show the corresponding GPM spectrums up to 50 Hz, wherein Hβ and low frequency (<4 Hz) reveal high GPM values.
