Modeling the fine structure of ear canal pressure and cochlear microphonics in response to a pure tone.
- Resource Type
- Article
- Authors
- Meaud, Julien; Wen, Haiqi; Samaras, George; Xia, Yiwei
- Source
- AIP Conference Proceedings. 2024, Vol. 3062 Issue 1, p1-6. 6p.
- Subject
- *EAR canal
*COCHLEA physiology
*HAIR cells
*COCHLEA
*GERBILS
*PREDICTION models
- Language
- ISSN
- 0094-243X
Experimental measurements of the ear canal pressure (ECP) and cochlear microphonics at the round window (RWCM) in response to a pure tone exhibit quasi-periodic ripples in the amplitude. This fine structure, which is hypothesized to be due to a linear reflection mechanism caused by inhomogeneities in the properties of the cochlear partition, can be used to provide noninvasive information about cochlear function. In this work, a previously developed model of the gerbil cochlea is used to study the generation of the fine structure on the ECP and RWCM. The model includes cochlear roughness due to inhomogeneities in the properties of outer hair cells (OHCs) and a longitudinal cable model to represent the propagation of electrical currents in the cochlear ducts. The fine structure predicted in both ECP and RWCM is in line with experimental measurements in other species. Model simulations are used to derive the reflection components of the ECP and RWCM by taking the difference between predictions with a model with roughness and a smooth model. Results from simulations are analyzed to determine the cochlear regions that contribute to the RWCM fine structure. [ABSTRACT FROM AUTHOR]