Acoustic input-admittance of the alligator-lizard ear: nonlinear features

Hearing Research
J J RosowskiT J Lynch

Abstract

The acoustic input-admittance at the alligator lizard's tympanic membrane varies with stimulus level; the magnitude of the variation can be as much as a factor of three. At 1.6 kHz, the frequency of maximum admittance magnitude, the admittance varies when the stimulus level exceeds 65 dB SPL. At frequencies above or below 1.6 kHz, larger SPLs are needed to produce admittance changes. With stimulus frequencies below 0.3 kHz or above 4.0 kHz the admittance is virtually constant for stimulus levels up to at least 100 dB SPL. The nonlinear behavior (a) is greatly reduced when the cochlear partition is destroyed, (b) does not return when the mechanical load of the partition is replaced, (c) is decreased by the introduction of proteolytic enzymes into the inner ear, and (d) is not affected by some manipulations that greatly reduce cochlear potentials. The results suggest that the mechanical properties of the cochlear partition are the source of the nonlinear admittance. Parallels between this phenomenon and two-tone distortion products in the ear canal (Rosowski et al. (1984): Hearing Res. 13, 141-158) suggest that the same nonlinear mechanical source that generates the level-dependent admittance also produces two-tone distortion pro...Continue Reading

References

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Citations

Sep 1, 2006·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·John J RosowskiJocelyn E Songer
Feb 1, 1992·Hearing Research·Y E CohenJ C Saunders
Aug 21, 2002·The Journal of the Acoustical Society of America·B L Farmer-Fedor, R D Rabbitt
May 1, 1990·The Annals of Otology, Rhinology, and Laryngology·J J RosowskiM D Coltrera
Dec 14, 2004·Journal of Neurophysiology·Zhi-Wu HuangHong-Bo Zhao
May 1, 1993·American Journal of Otolaryngology·Y E CohenJ C Saunders
Apr 20, 2021·Hearing Research·Jeffrey Tao ChengJohn Rosowski

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