模拟基底膜非线性和粗糙度对刺激频率耳声发射精细结构的联合效应。

Modeling the combined effects of basilar membrane nonlinearity and roughness on stimulus frequency otoacoustic emission fine structure.

作者信息

Talmadge C L, Tubis A, Long G R, Tong C

机构信息

National Center for Physical Acoustics, University of Mississippi, 38677, USA.

出版信息

J Acoust Soc Am. 2000 Dec;108(6):2911-32. doi: 10.1121/1.1321012.

DOI:10.1121/1.1321012

PMID:11144584

Abstract

A theoretical framework for describing the effects of nonlinear reflection on otoacoustic emission fine structure is presented. The following models of cochlear reflection are analyzed: weak nonlinearity, distributed roughness, and a combination of weak nonlinearity and distributed roughness. In particular, these models are examined in the context of stimulus frequency otoacoustic emissions (SFOAEs). In agreement with previous studies, it is concluded that only linear cochlear reflection can explain the underlying properties of cochlear fine structures. However, it is shown that nonlinearity can unexpectedly, in some cases, significantly modify the level and phase behaviors of the otoacoustic emission fine structure, and actually enhance the pattern of fine structures observed. The implications of these results on the stimulus level dependence of SFOAE fine structure are also explored.

摘要

提出了一个用于描述非线性反射对耳声发射精细结构影响的理论框架。分析了以下几种耳蜗反射模型：弱非线性、分布粗糙度以及弱非线性与分布粗糙度的组合。特别地，在刺激频率耳声发射（SFOAE）的背景下对这些模型进行了研究。与先前的研究一致，得出的结论是只有线性耳蜗反射能够解释耳蜗精细结构的潜在特性。然而，研究表明，在某些情况下，非线性会意外地显著改变耳声发射精细结构的电平与相位特性，并且实际上增强了所观察到的精细结构模式。还探讨了这些结果对SFOAE精细结构刺激电平依赖性的影响。