Abstract
The sound pressure near the tympanic membrane of gerbils was measured using a probe tube microphone during the injection of ac current into the basal turn of the cochlea. Electrical currents of up to 5 μA with frequencies ranging from 25 to 1500 Hz were used. The sound pressure signal was sampled, averaged, and stored by computer for subsequent Fourier analysis. The sound pressure is modulated as much as 1% by the electrical current. The modulation is proportional to current level and is a low‐pass function of electrical frequency with a time constant of approximately 1 ms. The modulation disappears in dead animals and is not observed if the current injection electrode is not in scala media. In addition, the modulation can vary with time and often deteriates in long experiments. Our data may be the result of changes in stiffness of the haircell stereocilia, mediated by changes in haircell membrane potential.
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