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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Using speech sounds to test functional spectral resolution in listeners with cochlear implants.

Matthew B Winn1, Ruth Y Litovsky2

  • 1Waisman Center and Department of Surgery, University of Wisconsin-Madison, 1500 Highland Avenue, Madison, Wisconsin 53705.

The Journal of the Acoustical Society of America
|March 20, 2015
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Summary

Cochlear implant (CI) users show different speech sound perception compared to normal hearing listeners. CI users rely more on spectral tilt, a coarse spectral cue, than formant transitions, a fine spectral cue.

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Area of Science:

  • Auditory Neuroscience
  • Speech Perception
  • Hearing Technology

Background:

  • Cochlear implants (CIs) aim to restore hearing but face challenges in spectral resolution.
  • Understanding how CI users process spectral cues is crucial for improving speech understanding.

Purpose of the Study:

  • To investigate functional spectral resolution in cochlear implant (CI) users.
  • To compare the perception of fine-resolution (formant transitions) and coarse-resolution (spectral tilt) spectral cues in CI users versus normal hearing (NH) listeners.

Main Methods:

  • Tested perception of the /ba/-/da/ speech contrast using formant transitions and spectral tilt.
  • Controlled spectral resolution in NH listeners using a noise vocoder to simulate electrical current spread.
  • Modeled perceptual weighting of cues using mixed-effects logistic regression.

Main Results:

  • Perceptual weighting of spectral cues varied systematically with spectral resolution.
  • NH listeners used formant cues more than CI listeners, especially in unprocessed speech.
  • CI users relied more on spectral tilt and less on formant transitions compared to NH listeners.
  • Cue-weighting results correlated moderately with word recognition scores.

Conclusions:

  • CI users exhibit altered functional spectral resolution compared to NH listeners.
  • CI users demonstrate a greater reliance on coarse spectral cues (spectral tilt) over fine spectral cues (formant transitions).
  • This method provides a framework for evaluating CI processing strategies and technological advancements.