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On the relation between hearing sensitivity and otoacoustic emissions

D McFadden1, R Mishra

  • 1Department of Psychology, University of Texas, Austin 78712.

Hearing Research
|December 1, 1993
PubMed
Summary

Individuals with spontaneous otoacoustic emissions (SOAEs) demonstrate better hearing sensitivity. This study directly links SOAE presence to improved quiet hearing, suggesting a shared underlying auditory mechanism.

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Area of Science:

  • Auditory Neuroscience
  • Human Hearing Physiology

Background:

  • Existing auditory literature suggests a correlation between spontaneous otoacoustic emissions (SOAEs) and better hearing.
  • However, direct experimental validation of this relationship has been lacking.

Purpose of the Study:

  • To directly investigate the relationship between the presence of SOAEs and hearing sensitivity in quiet conditions.
  • To examine potential sex-based differences in hearing sensitivity when SOAE prevalence is considered.

Main Methods:

  • Hearing sensitivity was measured in human subjects categorized by the presence (≥4 SOAEs) or absence of SOAEs in the right ear.
  • Measurements were conducted across various frequencies for both males and females.

Main Results:

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  • Subjects with SOAEs exhibited approximately 3 dB better hearing sensitivity, averaged across frequencies, in both ears compared to subjects without SOAEs.
  • Hearing sensitivity was significantly better in right ears than left ears.
  • The typically observed sex difference in hearing sensitivity (females better than males) was not found when SOAE prevalence was accounted for.

Conclusions:

  • A direct relationship exists between hearing sensitivity in quiet and the presence of SOAEs.
  • A common underlying physiological mechanism may be responsible for both SOAE generation and enhanced hearing sensitivity.
  • The previously reported sex difference in hearing may be confounded by differences in SOAE prevalence between sexes.