Abstract
The direct incorporation of negative resistance and nonlinear damping in a mechanical model of the basilar membrane (BM) may be used to. correlate BM response data as well as the properties of stimulated and spontaneous emissions in the external auditory meatus (S. Koshigoe and A. Tubis, 1982). We have tried to remedy the ad hoc nature of this formal “black box” approach by seeking a microscopic basis for the assumed nonlinear and active BM response. Such a basis is suggested by evidence that mechanical cochlear function is strongly influenced by efferent innervation of outer hair cells (OHC) (D.C. Mountain, 1980; J.H. Siegel and D.O. Kim, 1982). We consider the chain: OHC stereocilia deflection → nonlinear change in receptor potential (A.J. Hudsneth and P.P. Corey, 1977)→induced feedback force on the BM as the primary origin of nonlinear active cochlear response. Our proposed model is qualitatively compatible with data on cochlear emissions, nonlinear cochlear response, combination-tone psychophysics, and changes in cochlear response induced by COCB stimulation or variation of the endocochlear potential.
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