Laser amplification with a twist: traveling-wave propagation and gain functions from throughout the cochlea

The Journal of the Acoustical Society of America
C A Shera

Abstract

Except at the handful of sites explored by the inverse method, the characteristics-indeed, the very existence-of traveling-wave amplification in the mammalian cochlea remain largely unknown. Uncertainties are especially pronounced in the apex, where mechanical and electrical measurements lack the independent controls necessary for assessing damage to the preparation. At a functional level, the form and amplification of cochlear traveling waves are described by quantities known as propagation and gain functions. A method for deriving propagation and gain functions from basilar-membrane mechanical transfer functions is presented and validated by response reconstruction. Empirical propagation and gain functions from locations throughout the cochlea are obtained in mechanically undamaged preparations by applying the method to published estimates of near-threshold basilar membrane responses derived from Wiener-kernel (chinchilla) and zwuis analysis (cat) of auditory-nerve responses to broadband stimuli. The properties of these functions, and their variation along the length of the cochlea, are described. In both species, and at all locations examined, the gain functions reveal a region of positive power gain basal to the wave peak. ...Continue Reading

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Citations

Mar 6, 2009·Journal of the Association for Research in Otolaryngology : JARO·Watjana Lilaonitkul, John J Guinan
May 5, 2010·Journal of the Association for Research in Otolaryngology : JARO·Christopher A SheraAndrew J Oxenham
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