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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.

Perception of Sound Waves

Perception of Sound Waves

The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...

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...

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Related Experiment Video

Updated: May 21, 2025

Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses

Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses

Published on: January 23, 2017

Generational Differences in Audiometric and Self-Reported Hearing and Hearing Aid Use.

Lauren K Dillard¹, Lois J Matthews², Judy R Dubno²

¹Department of Otolaryngology - Head and Neck Surgery, Medical University of South Carolina, Charleston, SC, USA. dillalau@musc.edu.

Journal of the Association for Research in Otolaryngology : JARO

|May 19, 2025

Summary

Recent generations show lower rates of audiometric hearing loss, but generational differences in self-reported hearing difficulty and hearing aid use were not observed. These findings impact future hearing loss burden projections.

Keywords:

Aging Birth cohort Cohort studies Cross-sectional studies Epidemiology Hearing loss

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Last Updated: May 21, 2025

Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses

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Published on: January 23, 2017

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Simple Surgical Induction of Conductive Hearing Loss with Verification Using Otoscope Visualization and Behavioral Clap Startle Response in Rat

Simple Surgical Induction of Conductive Hearing Loss with Verification Using Otoscope Visualization and Behavioral Clap Startle Response in Rat

Published on: October 26, 2019

Area of Science:

Audiology
Epidemiology
Public Health

Background:

Birth cohort differences reflect societal changes impacting population health.
Understanding generational trends in hearing is crucial for public health planning.

Purpose of the Study:

To investigate birth cohort differences, defined by generation, in hearing-related outcomes.
To assess generational variations in audiometric hearing loss and self-reported hearing difficulty.

Main Methods:

A community-based cohort study analyzed 1554 participants across five generations (Greatest to Gen Z).
Audiometric hearing loss (pure-tone average > 25 dB HL) and self-reported hearing difficulty (Revised Hearing Handicap Inventory score ≥ 6) were primary outcomes.
Multivariable logistic regression models evaluated associations between generation and hearing outcomes, with sex-stratified analyses.

Main Results:

The prevalence of audiometric hearing loss was 48.9%, self-reported hearing difficulty was 48.8%, and hearing aid use was 22.0%.
Generation was associated with audiometric hearing loss in the overall sample and in males.
No consistent generational associations were found for self-reported hearing difficulty or hearing aid use.

Conclusions:

More recent generations exhibited a lower prevalence of audiometric hearing loss.
No significant generational disparities were identified in self-reported hearing difficulty or hearing aid utilization.
Identifying secular hearing trends aids in projecting future hearing loss burden and healthcare needs.