The location of most BM movement is a operate of stimulus frequency, with high-frequency waves being localized to the “base” of the cochlea and low-frequency waves approaching the “apex” of the cochlea. Thus every cochlear site has a characteristic frequency , to which it responds maximally. BM vibrations produce movement of hair cell stereocilia, which gates stereociliar transduction channels resulting in the era of hair cell receptor potentials and the excitation of afferent auditory nerve fibers. At the apex of the cochlea, nonlinearities look like much less prominent than at the base, perhaps implying that the cochlear amplifier plays a lesser position in figuring out apical mechanical responses to sound.

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