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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.

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Assessing Body Temperature - Tympanic membrane

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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...

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Related Experiment Video

Updated: Jan 5, 2026

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

Teacher Prescreening for Hearing Loss in the Developing World.

Justin R Shinn¹, Asitha D L Jayawardena¹, Ankita Patro¹

¹Department of Otolaryngology, 12328Vanderbilt University Medical Center, Nashville, TN, USA.

Ear, Nose, & Throat Journal

|October 15, 2019

Summary

Teachers in low-resource settings can effectively identify children with hearing loss. This approach achieved a 100% identification rate, improving hearing screening efficiency and enabling early intervention for affected students.

Keywords:

audiometry global health hearing loss hearing tests low- and middle-income countries low-resourced settings mobile health physician-extenders public health

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Last Updated: Jan 5, 2026

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

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Published on: March 24, 2023

Area of Science:

Public Health
Audiology
Pediatrics

Background:

Hearing loss is a significant global health issue, particularly in low-resource settings.
Efficient screening methods are crucial for early detection and intervention in children.
Traditional hearing screening programs face challenges in resource-limited environments.

Purpose of the Study:

To evaluate the effectiveness of teachers in identifying schoolchildren at risk of hearing loss.
To assess the efficiency of teacher-led prescreening for hearing impairment in low-resource settings.
To determine the potential of leveraging school teachers for hearing loss identification and early intervention.

Main Methods:

Prospective cohort study conducted in 4 semirural schools in Malindi, Kenya.
Comparison of preselected schoolchildren perceived as hearing impaired with those presumed to have normal hearing.
Utilized portable audiometry for hearing screening.

Main Results:

Eight out of 127 children (6.3%) failed the hearing screening.
All children who failed screening were initially identified by school teachers as high-risk.
Teacher prescreening demonstrated a 100% hearing loss identification rate and a 20% referral rate.

Conclusions:

Teachers can effectively identify schoolchildren with potential hearing loss in resource-limited settings.
Teacher prescreening significantly enhances hearing screening efficiency, identifying 1 in 5 children needing further evaluation.
This strategy supports early intervention for hearing impairment, overcoming challenges of universal screening in resource-constrained areas.