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Related Experiment Videos

Basilar membrane nonlinearity and loudness

R S Schlauch1, J J DiGiovanni, D T Ries

  • 1Department of Communication Disorders, University of Minnesota, Minneapolis 55455, USA. Schla001@maroon.tc.umn.edu

The Journal of the Acoustical Society of America
|May 5, 1998
PubMed
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This study derived the basilar membrane input-output function in normal hearing ears using loudness matching data from individuals with hearing loss. Results show a strong correlation between basilar membrane mechanics and loudness perception, especially for long tones.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Hearing Science

Background:

  • Understanding the relationship between physical sound processing in the cochlea and perceived loudness is crucial for diagnosing and treating hearing loss.
  • The basilar membrane's (BM) input-output (I/O) function describes how its mechanical response changes with sound intensity, but direct measurement in humans is challenging.

Purpose of the Study:

  • To derive the presumed basilar membrane (BM) input-output (I/O) function in a normal-hearing ear using loudness matching data from individuals with unilateral hearing loss.
  • To compare the derived BM I/O function with existing physiological data from animal models and human psychoacoustic data.

Main Methods:

  • Loudness matching functions were analyzed from individuals with one ear exhibiting hearing loss (shifted thresholds) and one normal ear.

Related Experiment Videos

  • A linearized cochlea model was assumed for the hearing-impaired ear to derive the normal ear's BM I/O function.
  • Comparisons were made with archival chinchilla BM I/O data and human loudness matching data for long-duration tones.

    • Main Results:

    • A close resemblance was found between the derived BM I/O function and loudness matching functions for long-duration tones, despite comparing human and chinchilla data.
    • Derived BM I/O functions became shallower as hearing loss increased (40-80 dB), with slopes for losses ≥60 dB aligning with physiological data.
    • The slope of the loudness function and derived BM I/O function correlated with behavioral tone thresholds, particularly for short tones in noise.

    Conclusions:

    • The study suggests a correspondence between basilar membrane displacement and loudness perception in cases of auditory recruitment for long tones.
    • The degree of hearing loss and signal duration influence basilar membrane compression, indicating that neural population responses may also contribute to loudness perception.