The effects of dc polarization of the cochlear partition were observed on harmonic distortion components in microphonics. The qualitative effects of negative polarization (scala vestibuli negative) were quite consistent and similar to those observed in the polarization of intermodulation distortion components. The effects of positive polarization were much more variable, but the general trends of the data suggest that when the stimulus is presented below 85-95 dB SPL, the harmonic distortion output is enhanced by both positive and negative polarizing currents. At higher intensities, these components behave much as the fundamental microphonic component. These results have been interpreted as indications that electromechanical and hydromechanical nonlinearities, respectively, dominate the distortion process over low-and high-intensity ranges. Subject Classification: 4.2.4.
ASJC Scopus subject areas
- Acoustics and Ultrasonics
- Arts and Humanities (miscellaneous)