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Related Experiment Videos

Cochlear compression in listeners with moderate sensorineural hearing loss.

Enrique A Lopez-Poveda1, Christopher J Plack, Ray Meddis

  • 1Instituto de Neurociencias de Castilla y León, Universidad de Salamanca, Avenida Alfonso X El Sabio s/n, 37007 Salamanca, Spain. ealopezpoveda@usal.es

Hearing Research
|June 15, 2005
PubMed
Summary

Hearing-impaired listeners show compressive basilar membrane responses, but the amount varies. Damage to hair cells may explain differences in compression, impacting auditory perception.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Audiology

Background:

  • Normal-hearing listeners demonstrate consistent basilar membrane (BM) compression across characteristic frequencies (CFs).
  • Compression's frequency range is widest at lower CFs.
  • Sensorineural hearing loss (SHL) may alter these compression characteristics.

Purpose of the Study:

  • To investigate basilar membrane (BM) response compression in hearing-impaired (HI) listeners with SHL.
  • To compare BM compression in HI listeners to normal-hearing (NH) listeners.
  • To explore the relationship between hair cell damage and BM compression in HI ears.

Main Methods:

  • Temporal masking curves (TMCs) were measured for probe frequencies (500-8000 Hz) and masker frequencies (0.5-1.2x probe).

Related Experiment Videos

  • Basilar membrane (BM) response functions were estimated from TMCs.
  • Estimated BM functions for HI listeners were compared to NH listeners.

    • Main Results:

    • Compressive BM responses were observed for tones at and below CF in all three HI ears.
    • The maximum compression amount was largely uncorrelated with absolute hearing threshold.
    • Two HI ears showed near-normal compression; one showed reduced compression, especially at higher CFs (>4000 Hz).

    Conclusions:

    • Compressive BM responses occur in SHL, but the degree can vary.
    • Differences in compression may relate to the extent of inner and outer hair cell damage.
    • The findings prompt re-evaluation of assumptions in behavioral methods for estimating BM compression.