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Sound Intensity Level

Sound Intensity Level

Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and...

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Related Experiment Video

Updated: May 21, 2025

A Low Cost Setup for Behavioral Audiometry in Rodents

A Low Cost Setup for Behavioral Audiometry in Rodents

Published on: October 16, 2012

Two Tests for Quantifying Aided Hearing at Low- and High-Input Levels.

Carl Pedersen^1,2, Jesper Hvass Schmidt^1,2, Ellen Raben Pedersen³

¹Research Unit for ORL - Head & Neck Surgery and Audiology, Odense University Hospital, Odense, Denmark, University of Southern Denmark, Odense, Denmark.

Trends in Hearing

|March 18, 2025

Summary

This summary is machine-generated.

New hearing tests accurately measure aided hearing across a wide sound range. These reliable tests help optimize hearing aid fittings for better audibility and comfort.

Keywords:

hearing aids hearing in noise test loudness perception overamplification speech perception underamplification

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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
Hearing Science
Speech and Hearing Sciences

Background:

Hearing aid fitting often struggles with under- or overamplification of sound.
Quantifying aided hearing across everyday sound levels is crucial for effective hearing aid use.

Purpose of the Study:

To implement and evaluate two new variants of the Hearing in Noise Test (HINT) for assessing aided hearing at the lower and upper limits of everyday sound levels.
To determine the test-retest reliability of these new HINT variants in adult hearing aid users.

Main Methods:

30 adult hearing aid users participated in the study.
A test battery included the standard Danish HINT, a lower-threshold HINT variant, and an upper-threshold HINT variant.
Participants completed the test battery twice to assess test-retest reliability.

Main Results:

Both new HINT variants demonstrated high test-retest reliability, with small effect sizes for test-retest differences.
Pearson correlation coefficients indicated strong and significant correlations between test and retest for all HINT versions.
Within-subject standard deviations were 0.8 dB for standard HINT, 0.9 dB for the lower-end test, and 2.2 dB for the upper-end test.

Conclusions:

The new lower-end and upper-end HINT variants provide consistent and reliable measurements of aided hearing.
These tests are valuable tools for optimizing hearing aid amplification and improving patient outcomes.