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The SSVEPs elicited by no flicker and time-varying PAC flicker, averaged for each condition across subjects. (A) The HHT and time-varying HHS analysis of SSVEPs induced by no flicker. The amplitude spectra are unclear for both methods. (B) The HHT and time-varying HHS analysis of SSVEPs induced by time-varying PAC flicker. The amplitudes increased at 3 Hz AM modulating 16 Hz carrier corresponding to the stimulation waveform.
