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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...

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...

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...

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.

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Related Experiment Video

Updated: Apr 26, 2026

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Published on: January 25, 2016

How neuroscience relates to hearing aid amplification.

K L Tremblay¹, C W Miller¹

¹Department of Speech and Hearing Sciences, University of Washington, Seattle, WA 98105, USA.

International Journal of Otolaryngology

|July 22, 2014

Summary

This review explores how physiological data can enhance hearing aid technology for individuals with hearing loss, improving sound audibility in noisy environments. Researchers are leveraging neuroscience, clinical insights, and engineering to optimize hearing aid design and user benefit.

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Optogenetic Stimulation of the Auditory Nerve

Optogenetic Stimulation of the Auditory Nerve

Published on: October 8, 2014

Area of Science:

Neuroscience
Audiology
Biomedical Engineering

Background:

Hearing aids aim to improve audibility for hearing loss but effectiveness varies, especially with background noise.
Individual differences in processing amplified sound impact real-world hearing aid performance.

Purpose of the Study:

To review the use of physiological information in improving hearing aid design and application.
To bridge the gap between neuroscience, audiology, and engineering for better hearing solutions.

Main Methods:

Review of current research integrating physiological signals (e.g., EEG, fMRI, otoacoustic emissions) with hearing aid technology.
Analysis of how different physiological measures inform hearing aid signal processing and fitting algorithms.

Main Results:

Physiological data offers objective insights into auditory perception and neural processing, aiding personalized hearing aid adjustments.
Integration of physiological feedback can lead to more adaptive and effective hearing aid algorithms, enhancing speech understanding in noise.

Conclusions:

Utilizing diverse physiological information is crucial for advancing hearing aid technology beyond basic amplification.
A multidisciplinary approach combining neuroscience, clinical audiology, and engineering is key to developing next-generation hearing aids that cater to individual auditory needs.