4.21 cochlear microphonic. Alternating current electric potential generated within the cochlea in response to a sound stimulus. At low and moderate sound pressures the amplitude of the cochlear microphonic is proportional to the instantaneous sound pressure of the stimulus, and is a faithful reproduction of the stimulus waveform. The source of the cochlear microphonic is believed to be the hair cells in the organ of Corti. Unit, volt (V).
Annotation 1 At low and moderate sound pressures, the amplitude of the cochlear microphonic is a linear function of the instantaneous displacement of the basilar membrane.
Annotation 2 Maximum peak amplitude of the cochlear microphonic within the scala media is 2 to 5 mV.
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