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Auditory filter nonlinearity in mild/moderate hearing impairment.

Richard J Baker1, Stuart Rosen

  • 1Human Communication and Deafness, School of Education, University Of Manchester, United Kingdom. richard.baker@man.ac.uk

The Journal of the Acoustical Society of America
|April 5, 2002
PubMed
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Hearing impairment reduces the nonlinear behavior of auditory filters, making them more linear across different sound levels. This loss of nonlinearity is evident even in mild hearing loss cases.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Audiology

Background:

  • Sensorineural hearing loss (SHL) often leads to reduced frequency selectivity.
  • The impact of SHL on the level-dependent nature of auditory selectivity is less understood.
  • Normal hearing exhibits prominent nonlinearity in auditory filter characteristics.

Purpose of the Study:

  • To investigate changes in auditory filter nonlinearity in individuals with mild to moderate hearing impairment.
  • To characterize how hearing loss affects the level-dependent properties of auditory filters.
  • To quantify the reduction in nonlinearity in the auditory system due to hearing impairment.

Main Methods:

  • Measured notched-noise masked thresholds at 2 kHz in hearing-impaired listeners (20-50 dB loss).

Related Experiment Videos

  • Utilized various notch widths across a range of stimulus levels.
  • Estimated level-dependent auditory filter shapes and derived input/output functions.

    • Main Results:

    • Growth-of-masking functions were more parallel in hearing-impaired listeners, suggesting a more linear filter.
    • Auditory filter shapes showed minimal change across different sound levels in impaired listeners.
    • Reduced nonlinearity was observed even in listeners with mild 20-dB hearing loss.

    Conclusions:

    • Mild to moderate sensorineural hearing loss significantly reduces the nonlinearity of auditory filters.
    • This loss of nonlinearity impacts the level-dependent processing of sound.
    • Auditory system nonlinearity is compromised early in the progression of hearing impairment.