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Pitch frequency estimates are invariant to sound level. The pooled first-order ISI histograms have a major peak at 5 ms (1/F0) for sound level from 50 to 80 dB (bottom to top). The harmonic frequencies of the MF complex are {600, 800, 1000} Hz with fundamental frequency F0 = 200 Hz. The lower amplitude of the peak at sound level 50 dB (bottom) is due to the lower input rate from AN fibers.
