English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The cochlea or inner ear has a remarkable ability to amplify sound signals.This is understood to derive at least in part from some active process thatmagnifies vibrations of the basilar membrane (BM) and the cochlear partition inwhich it is embedded, to the extent that it overcomes the effect of viscousdamping from the surrounding cochlear fluid. Many authors have associated thisamplification ability to some type of mechanical resonance within the cochlea,however there is still no consensus regarding the precise cause ofamplification. Our work is inspired by experiments showing that the outer haircells within the cochlear partition change their lengths when stimulated, whichcan in turn cause periodic distortions of the BM and other structures in thecochlea. This paper investigates a novel fluid-mechanical resonance mechanismthat derives from hydrodynamic interactions between an oscillating BM and thesurrounding cochlear fluid. We present a model of the cochlea based on theimmersed boundary method, in which a small-amplitude periodic internal forcingdue to outer hair cells can induce parametric resonance. A Floquet stabilityanalysis of the linearized equations demonstrates the existence of resonant(unstable) solutions within the range of physical parameters corresponding tothe human auditory system. Numerical simulations of the immersed boundaryequations support the analytical results and clearly demonstrate the existenceof resonant solution modes. These results are then used to illustrate theinfluence of parametric resonance on wave propagation along the BM and explicitcomparisons are drawn with results from another two-dimensional cochlea model.

An immersed boundary model of the cochlea with parametric forcing