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Related Experiment Videos

Voice onset time encoding in patients with left and right cochlear implants.

Stéphane Roman1, Georges Canévet, Christian Lorenzi

  • 1Laboratoire d'Audio-Phonologie Clinique, Centre Hospitalier Universitaire de La Timone, F-13385 Marseille Cedex 5, France.

Neuroreport
|April 20, 2004
PubMed
Summary

Auditory evoked potentials (AEPs) reveal how cochlear implant patients (CIP) perceive speech sounds. Poor temporal processing in AEPs correlates with reduced speech discrimination, offering an objective measure for implanted children.

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Area of Science:

  • Neuroscience
  • Audiology
  • Speech-Language Pathology

Background:

  • Cochlear implants (CIP) aim to restore hearing but speech perception varies.
  • Understanding the neural encoding of speech cues is crucial for improving implant efficacy.
  • Auditory evoked potentials (AEPs) offer a non-invasive method to assess auditory processing.

Purpose of the Study:

  • To investigate stop-consonant discrimination in normal-hearing listeners and CIP using AEPs.
  • To determine if AEPs reflect temporal processing of speech cues (/b epsilon/ vs. /p epsilon/).
  • To establish AEPs as an objective measure of speech perception in CIP.

Main Methods:

  • Recording AEPs to /b epsilon/ and /p epsilon/ syllables in normal-hearing listeners and CIP.
  • Analyzing time-locking of AEP components to stimulus temporal structure (voice onset time).

Related Experiment Videos

  • Correlating AEP measures with psychophysically determined discrimination thresholds.

    • Main Results:

    • AEPs demonstrated time-locked components reflecting the temporal structure of speech syllables in both groups.
    • The side of cochlear implantation did not influence AEP structure or discrimination thresholds.
    • A significant association was found between poor AEP time-locking and impaired speech discrimination.

    Conclusions:

    • AEPs objectively index temporal processing of speech cues in CIP.
    • EEG-based temporal processing assessment can serve as a reliable measure of speech perception in CIP.
    • This method holds potential for evaluating speech processing in implanted children.