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Factors affecting speech understanding in gated interference: cochlear implant users and normal-hearing listeners
1Department of Communication Disorders, University of Minnesota, Minneapolis, Minnesota 55455, USA. nelso477@umn.edu
The Journal of the Acoustical Society of America
|May 14, 2004
Summary
Cochlear implant users struggle with modulated noise due to poor spectral information and auditory fusion. Improving spectral channels and auditory fusion may enhance speech understanding in complex sound environments for implant users.
Area of Science:
- Auditory Neuroscience
- Speech Perception
- Hearing Technology
Background:
- Previous research indicated cochlear implant (CI) users do not benefit from masking release in modulated noise.
- This lack of benefit was observed across different devices and speech processing strategies.
Purpose of the Study:
- To investigate the causes of reduced masking release in CI users.
- To examine the roles of spectral resolution and auditory fusion in speech perception with CI simulation.
Main Methods:
- Tested normal-hearing listeners, CI users, and normal-hearing listeners with a 4-band CI simulation.
- Assessed speech understanding in gated noise with varying duty cycles and gate frequencies.
- Evaluated auditory fusion by testing understanding of gated sentences.
Main Results:
- Noise duty cycle did not systematically affect performance, suggesting masking is not solely energetic.
- Increased spectral channels (4 to 12) significantly improved masking release and gated sentence understanding in simulations.
- CI and simulation listeners showed significant difficulty with gated sentences, indicating auditory fusion limitations.
Conclusions:
- Reduced masking release in CI users is linked to degraded spectral information.
- Limitations in auditory fusion across temporal gaps also contribute to speech understanding difficulties.
- Improving spectral resolution and auditory fusion may enhance CI users' ability to process speech in modulated noise.