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Related Experiment Videos

Holes in hearing.

Robert V Shannon1, John J Galvin, Deniz Baskent

  • 1House Ear Institute, Los Angeles, CA 90057, USA. shannon@hei.org

Journal of the Association for Research in Otolaryngology : JARO
|August 7, 2002
PubMed
Summary
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Spectral holes in the cochlea significantly impair speech recognition, especially for vowels and consonants. Rerouting spectral information did not improve performance, indicating that preserving tonotopic representation is crucial for hearing prosthetics.

Area of Science:

  • Auditory Neuroscience
  • Speech Perception
  • Prosthetic Devices

Background:

  • Correct tonotopic representation is vital for speech recognition.
  • Hearing aids and cochlear implants can cause frequency/place mismatches.
  • Neural damage can create spectral holes, distorting frequency mapping.

Purpose of the Study:

  • To quantitatively assess the impact of spectral holes on speech recognition.
  • To investigate the effect of hole location and size on speech perception.
  • To evaluate strategies for managing spectral information around cochlear holes.

Main Methods:

  • Speech processing using a 20-band processor (SPEAK for CI, noise processor for NH).
  • Creation of spectral holes (1.5-6 mm) in basal, middle, or apical cochlear regions.

Related Experiment Videos

  • Measurement of vowel, consonant, and sentence recognition under different spectral information redistribution conditions.

    • Main Results:

    • Speech features reliant on spectral cues (consonant place, vowel identity) were more affected.
    • Apical cochlear holes caused greater deficits than basal or middle holes.
    • No significant difference was found when spectral information was dropped versus redistributed.

    Conclusions:

    • Spectral holes significantly impair speech recognition, particularly in the apical cochlea.
    • Loss of spectral information, not just frequency mapping distortion, is the primary cause of deficits.
    • Current strategies for rerouting spectral information around holes are ineffective.