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Phase consistency of a ‘dipping da’ and a ‘level-F0 da’ using single polarity, added polarity, and subtracted polarity responses. For FFRs to either sound, in the single polarity, the fundamental frequency, second harmonic and formant frequencies all show the strongest phase coherence (red lines). Adding emphasizes the phase coherence of the lower frequencies, below ~600 Hz, and subtracting emphasizes the phase coherence of the higher frequencies above ~600 Hz.
