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Hearing

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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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Intensity just-noticeable differences at equal-loudness levels in normal and pathological ears

J A Stillman¹, J J Zwislocki, M Zhang

¹Institute for Sensory Research, Syracuse University, New York 13244.

The Journal of the Acoustical Society of America

|January 1, 1993

Summary

This study found that intensity discrimination, measured by just-noticeable differences (jnd

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Area of Science:

Audiology
Psychoacoustics
Sensory neuroscience

Background:

Understanding intensity discrimination is crucial for diagnosing and treating hearing impairments.
Cochlear hearing loss often leads to loudness recruitment, affecting the perception of sound intensity.
Investigating the relationship between loudness and intensity discrimination helps elucidate auditory processing mechanisms.

Purpose of the Study:

To investigate the relationship between loudness level and intensity discrimination in the frequency range of 0.5-6.5 kHz.
To compare intensity just-noticeable differences (jnd's) at equal-loudness levels in individuals with unilateral hearing loss.
To determine how loudness recruitment influences intensity discrimination in impaired ears.

Main Methods:

Comparing intensity jnd's at equal-loudness levels in the better and poorer ears of eight individuals with unilateral cochlear hearing loss.
Correlating jnd's with loudness level, sound-pressure level (SPL), and sensation-level (SL) across different frequency ranges.
Analyzing the effects of loudness recruitment on the relationship between these auditory variables.

Main Results:

No systematic differences in jnd's were found between the better and poorer ears at equal-loudness levels across the group.
Statistically, equal-loudness jnd's did not differ significantly between ears, though corresponding SLs and SPLs did.
The rate of loudness growth did not impact jnd's, and mean jnd's decreased with sound intensity, consistent with the near-miss to Weber's law.

Conclusions:

Intensity discrimination is primarily related to loudness level, not SPL or SL, in individuals with unilateral cochlear hearing loss.
Loudness recruitment, while altering SPL and SL relationships, does not systematically impair intensity discrimination at equal-loudness levels.
The findings support the near-miss to Weber's law and highlight the importance of loudness level in auditory intensity perception.