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Changes in voice-onset time in speakers with cochlear implants

H Lane1, J Wozniak, J Perkell

  • 1Massachusetts Institute of Technology, Research Laboratory of Electronics, Cambridge 02139.

The Journal of the Acoustical Society of America
|July 1, 1994
PubMed
Summary
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Cochlear implants improved speech production in deafened adults. Patients showed better voice-onset time (VOT) and syllable duration, suggesting hearing aids calibrate speech mechanisms.

Area of Science:

  • Speech acoustics
  • Auditory neuroscience
  • Phonetics

Background:

  • Postlingually deafened adults often exhibit altered speech production.
  • Multichannel cochlear implants restore some auditory function.

Purpose of the Study:

  • To investigate the impact of cochlear implants on voice-onset time (VOT) and syllable duration in deafened adults.
  • To evaluate if restored hearing aids in calibrating speech production mechanisms.

Main Methods:

  • Measured VOT and syllable duration in four postlingually deafened cochlear implant recipients before and after device activation.
  • Adjusted VOT for syllable duration changes (VOTc) to isolate voicing effects.
  • Compared patient data to normative data from hearing speakers.

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Main Results:

  • Three of four patients reduced syllable duration post-implantation.
  • Pre-implantation, all patients had abnormally short VOT for voiced plosives.
  • Following implantation, three patients lengthened VOTc, indicating improved voicing contrast perception and production.
  • Patients made few voicing errors in post-implantation listening tests.

Conclusions:

  • Restored auditory feedback via cochlear implants appears to help calibrate speech production mechanisms.
  • The study supports the hypothesis that hearing is crucial for monitoring and adjusting articulation.
  • VOT and syllable duration changes reflect improved voicing perception and production in cochlear implant users.