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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.

Anatomy of the Ear

Anatomy of the Ear

Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...

Hair Cells

Hair Cells

Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.

Perceiving Loudness, Pitch, and Location

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...

Auditory Pathway

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...

Sound Waves: Interference

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...

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Updated: Jun 7, 2026

Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol

Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol

Published on: August 18, 2023

Modeling cochlear dynamics: interrelation between cochlea mechanics and psychoacoustics.

Bastian Epp¹, Jesko L Verhey, Manfred Mauermann

¹Neuroacoustics, Institute of Physics, Carl von Ossietzky Universität Oldenburg, Carl-von-Ossietzky-Str. 9-11, Oldenburg 26111, Germany. Bastian.Epp@uni-oldenburg.de

The Journal of the Acoustical Society of America

|October 26, 2010

Summary

This summary is machine-generated.

A new cochlear model integrates physiological and psychoacoustic approaches, simulating otoacoustic emissions and auditory perception. This model accurately reproduces key cochlear functions and auditory phenomena in healthy ears.

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Area of Science:

Auditory Neuroscience
Bioacoustics
Computational Auditory Modeling

Background:

Bridging the gap between otoacoustic emission models and psychoacoustic filter models is crucial.
Existing models often fail to integrate physiological data with psychoacoustic observations.

Purpose of the Study:

To develop a unified nonlinear, active, one-dimensional transmission line model of the cochlea.
To validate the model against physiological and psychoacoustic data using a single parameter set.

Main Methods:

Development of a nonlinear and active one-dimensional transmission line cochlear model.
Simulation of cochlear excitation patterns, input-output functions, and two-tone suppression.
Modeling of distortion product otoacoustic emissions (DPOAEs), stimulus-frequency otoacoustic emissions (SFOAEs), and spontaneous otoacoustic emissions (SOAEs).

Main Results:

The model demonstrated plausible excitation patterns and a linear-compressive-linear input-output function.
Realistic simulations of DPOAE growth, SFOAE finestructure, and SOAEs were achieved.
The model successfully explained psychoacoustic modulation detection data near threshold through cochlear mechanics.

Conclusions:

The developed cochlear model effectively integrates physiological and psychoacoustic paradigms.
It provides a powerful tool for investigating acoustic signal representation in healthy and impaired cochleae.
The model advances our understanding of the auditory pathway's early stages.