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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.

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...

Auditory Perception

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach 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.

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Related Experiment Video

Updated: Mar 20, 2026

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Published on: January 25, 2016

Effect of conductive hearing loss on central auditory function.

Arash Bayat¹, Mohammad Farhadi², Hesam Emamdjomeh³

¹Ahvaz Jundishapur University of Medical Sciences, Hearing and Speech Research Center, Ahvaz, Iran.

Brazilian Journal of Otorhinolaryngology

|May 30, 2016

Summary

Individuals with chronic conductive hearing loss (CHL) demonstrate reduced auditory temporal processing (ATP) abilities. This study highlights the need for clinical evaluation of ATP in CHL patients.

Keywords:

Adult Adulto Auditory temporal processing Conductive hearing loss Gap in noise Gap no ruído Perda auditiva condutiva Processamento temporal auditivo

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Area of Science:

Audiology
Neuroscience
Speech and Hearing Sciences

Background:

Long-term conductive hearing loss (CHL) may impair auditory temporal processing (ATP), crucial for speech comprehension and sound localization.
The impact of CHL on central auditory processing, particularly temporal aspects, remains under-investigated.

Purpose of the Study:

To assess auditory temporal processing (ATP) in individuals with chronic conductive hearing loss (CHL).

Main Methods:

A cross-sectional study involving 52 adults with mild to moderate CHL and 52 normal-hearing controls (aged 18-45).
Auditory temporal processing was evaluated using the Gaps-in-Noise (GIN) test.
Analysis focused on gap detection thresholds and correct response percentages for each ear.

Main Results:

Participants with CHL exhibited significantly higher GIN thresholds (poorer performance) in both ears compared to controls.
CHL group showed significantly lower percentages of correct responses on the GIN test for both ears.
No correlation was observed between GIN test performance and the degree of hearing loss.

Conclusions:

Adults with CHL demonstrate diminished auditory temporal processing capabilities compared to normal-hearing individuals.
Clinical protocols for evaluating ATP in patients with CHL are recommended.