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Talker intelligibility differences in cochlear implant listeners.

Tim Green1, Sotira Katiri, Andrew Faulkner

  • 1Department of Phonetics and Linguistics, University College London, 4 Stephenson Way, London NW1 2HE, United Kingdom.

The Journal of the Acoustical Society of America
|June 8, 2007
PubMed
Summary
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Speech intelligibility differences between talkers persist for cochlear implant (CI) users, mirroring findings in normal-hearing listeners. Key speech characteristics influencing intelligibility remain detectable even with CI processing.

Area of Science:

  • Audiology and Speech Sciences
  • Hearing Technology and Rehabilitation

Background:

  • Individual differences in speech intelligibility are well-documented in normally-hearing individuals.
  • The impact of these across-talker intelligibility variations on cochlear implant (CI) users is not fully understood.

Purpose of the Study:

  • To investigate if speech intelligibility differences observed across talkers in normal hearing are also present in cochlear implant users.
  • To determine if the acoustic properties crucial for intelligibility are preserved in cochlear implant-processed speech.

Main Methods:

  • Speech perception tests were conducted using male, female, and child talkers with varying intelligibility.
  • Assessments included normal hearing conditions, as well as actual and simulated cochlear implant (CI) processing.

Related Experiment Videos

Main Results:

  • Cochlear implant (CI) users exhibited poorer overall speech recognition compared to normal-hearing listeners, as anticipated.
  • Crucially, consistent differences in talker intelligibility were observed across all listener groups, including CI users.
  • No single acoustic feature was identified as the sole determinant of these intelligibility variations.

Conclusions:

  • The primary factors contributing to across-talker speech intelligibility differences are largely preserved in the cochlear implant (CI) signal.
  • These findings suggest that CI processing maintains the relative intelligibility variations between different speakers.