Abstract
We propose a feedback model for cochlear mechanics in which the hair cell cilia exert an active restoring force in response to displacement. The restoring force is described by first order kinetics and leads to an increase in sensitivity and frequency selectivity of the basilar membrane response. Several different experimental results from our laboratory suggest that hair cell membrane potential plays an important role in this feedback process. They include the measurement of acoustic emissions in response to passing sinusoidal electric current through the cochlea and the modulation of the sound pressure level (SPL) of single tones by electrical current. The latter effect saturates at levels of the acoustic stimulus similar to the level at which the cochlear microphonic saturates. The experimental data suggest that saturation of the transduction process at high SPL could account for the saturating nonlinearity observed by others in basilar membrane displacement. These electromechanical effects may also explain the generation of acoustic harmonics and distortion products as well as the positive cochlear summating potential.
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Dallos, P., Santos-Sacchi, J., and Flock, Å. (1982). Intracellular recordings from cochlear outer cells, Science 218, 582–584.
Evans, E.F. (1976). Temporary sensorineural hearing losses and 8th nerve changes. In: Effects of Noise on Hearing, edited by D. Henderson, R.P. Hamernik, D.S. Dosanjh and J.H. Mills (Raven Press, New York), 199–221.
Gold, T. (1948). Hearing. II. The physical basis of the action of the cochlea, Proc. Roy. Soc. B. 210, 71–72.
Hubbard, A.E., and Mountain, D.C. (1982). Injection of AC current into scala media alters the sound pressure at the tympanic membrane: Variations with acoustic stimulus parameters, J. Acoust. Soc. Am. 71, S100.
Hubbard, A.E., Voigt, H.F., and Mountain, D.C. (1983). Injection of direct current into scala media alters auditory-nerve response properties, Abstracts of the Sixth Midwinter Research Meeting, Association for Research in Otolaryngology, 103–104.
Khanna, S.M., and Leonard, D.G.B. (1982). Basilar membrane tuning in the cat cochlea, Science 215, 305–306.
McMullen, T. (1983). Model of summating potential production by voltagedependent cilia stiffness, Abstracts of the Sixth Midwinter Research Meeting, Association for Research in Otolaryngology, 68–69.
Mountain, D.C. (1980). Changes in endolymphatic potential and crossed olivo-cochlear bundle stimulation alter cochlear mechanics, Science 210, 71–72.
Mountain, D. C., and Hubbard, A.E. (1983). Injection of alternating current into scala media produces an ear canal emission of cochlear origin, Abstracts of the Sixth Midwinter Research Meeting, Association for Research in Otolaryngology, 103.
Neely, S.T., and Kim, D.O. (1982). An active model for sharp tuning and high sensitivity in cochlear mechanisms, J. Acoust. Soc. Am. 71, S16.
Nuttall, A.L. (1983). Inner hair cell dc receptor potential changes from direct currents introduced into the quinea pig cochlea, Abstracts of the Sixth Midwinter Research Meeting, Association for Research in Otolaryngology, 104–105.
Rhode, W.S. (1971). Observations of the vibration of the basilar membrane in squirrel monkeys using the Mossbauer technique, J. Acoust. Soc. Am. 49, 1218–1231.
Strelioff, D., and Flock, Å. (1982). Mechanical properties of receptor cells in the guinea pig cochlea, Soc. Neurosci. Abstr. 8, 40.
Teas, D. C., Konishi, T., and Wernick, J.S. (1970) Effects of electrical current applied to the cochlear partition on discharges in individual auditory-nerve fibers, II. Interaction of electrical polarization and acoustic stimulation, J. Acoust. Soc. Am. 50, 587–601.
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© 1983 Delft University Press, The Netherlands
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Mountain, D.C., Hubbard, A.E., McMullen, T.A. (1983). Electromechanical Processes in the Cochlea. In: de Boer, E., Viergever, M.A. (eds) Mechanics of Hearing. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-6911-7_14
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DOI: https://doi.org/10.1007/978-94-009-6911-7_14
Publisher Name: Springer, Dordrecht
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