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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.

Hearing

Hearing

When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.

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...

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.

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...

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...

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Related Experiment Video

Updated: Mar 21, 2026

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

Published on: December 20, 2024

Recent developments in air-conduction hearing aids

¹ENT Department, Linköping University, Sweden.

Ear, Nose, & Throat Journal

|May 1, 1997

Summary

This summary is machine-generated.

Digital hearing aids offer powerful new tools for real-world testing of signal processing. This technology allows for unbiased comparisons, paving the way for significant user benefits in hearing assistance.

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Last Updated: Mar 21, 2026

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

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Published on: December 20, 2024

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Published on: October 11, 2024

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

Area of Science:

Audiology
Digital Signal Processing
Biomedical Engineering

Background:

Traditional hearing aids relied on analog signal processing.
Complex signal processing schemes were limited to laboratory settings.
Previous clinical trials suffered from bias comparing new vs. old hearing aids.

Purpose of the Study:

To introduce the advent of digital hearing aids and their potential.
To highlight the capability for real-world field testing of advanced signal processing.
To emphasize the potential for unbiased comparative studies of hearing aid technologies.

Main Methods:

Leveraging wearable digital hearing aids for powerful, real-world testing.
Utilizing software-controlled signal processing algorithms for flexibility.
Designing blind field tests to eliminate bias in comparative studies.

Main Results:

Digital hearing aids provide enhanced tools for extensive field testing of signal processing ideas.
Software control enables unbiased, blind comparisons of different processing schemes.
The digital era promises noticeable benefits for hearing aid users.

Conclusions:

The transition to digital hearing aids marks a significant advancement, enabling rigorous field testing.
Blind comparative studies are now feasible, overcoming historical biases.
Future research in digital signal processing will likely benefit various assistive listening devices.