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The Cochlea

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

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Sound Waves: Resonance

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Double Resonance Techniques: Overview

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Related Experiment Video

Updated: May 17, 2026

Cochlear Surface Preparation in the Adult Mouse

Cochlear Surface Preparation in the Adult Mouse

Published on: November 6, 2019

A resonance approach to cochlear mechanics.

¹Eccles Institute of Neuroscience, John Curtin School of Medical Research, The Australian National University, Canberra, Australia. andrew.bell@anu.edu.au

|November 13, 2012

Summary

This study proposes a resonance-based model for cochlear mechanics, suggesting that a travelling wave arises from coupled oscillators, not just wave propagation. This explains frequency analysis and cochlear sound emissions.

Area of Science:

Auditory Neuroscience
Bioacoustics
Mechanical Engineering

Background:

The cochlea's frequency analysis mechanism has been debated, shifting from Helmholtz's resonance theory to Békésy's travelling wave theory.
The discovery of cochlear sound emissions in 1978 reopened questions about the adequacy of the current travelling wave model.
Recent findings challenge the conventional understanding of cochlear travelling waves, necessitating a re-evaluation of cochlear mechanics.

Purpose of the Study:

To re-examine cochlear frequency analysis using basic resonance principles.
To investigate if a resonance-based model can explain experimental observations in cochlear mechanics.
To propose an alternative framework for understanding the cochlea as a system of coupled oscillators.

Main Methods:

Related Experiment Videos

Last Updated: May 17, 2026

Cochlear Surface Preparation in the Adult Mouse

Cochlear Surface Preparation in the Adult Mouse

Published on: November 6, 2019

A graded bank of harmonic oscillators, mimicking cochlear frequencies and quality factors, was simultaneously excited.
Basic resonance principles were applied to analyze the system's frequency responses, group delays, and wave velocities.
The behavior of coupled oscillator chains, including travelling waves and resonance phenomena, was reviewed.

Main Results:

The resonance model produced frequency responses, group delays, and travelling wave velocities consistent with experimental data.
A gradient in group delay was observed, leading to a decelerating wave of peak displacement from cochlear base to apex.
The model demonstrated that an apparent travelling wave can emerge from coupled resonators without direct energy transfer.

Conclusions:

Cochlear mechanics can be explained by a travelling wave arising from coupled harmonic oscillators, rather than solely wave propagation.
Phase and group delays in driven harmonic oscillators can generate an apparent travelling wave, highlighting the role of fast pressure waves.
The cochlea can be modeled as a chain of globally forced coupled oscillators, integrating aspects of both resonance and travelling wave theories.