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Related Experiment Videos

Effect of delayed auditory feedback on normal speakers at two speech rates.

Andrew Stuart1, Joseph Kalinowski, Michael P Rastatter

  • 1Department of Communication Sciences and Disorders, East Carolina University, Greenville, North Carolina 27858-4353, USA. stuarta@mail.ecu.edu

The Journal of the Acoustical Society of America
|June 8, 2002
PubMed
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Delayed auditory feedback (DAF) significantly increased speech dysfluencies in normal speakers at longer delays (200 ms) and faster speech rates. These findings suggest DAF

Area of Science:

  • Speech production and perception
  • Auditory feedback mechanisms
  • Fluency and dysfluency in speech

Background:

  • Auditory feedback is crucial for real-time speech production.
  • Delayed auditory feedback (DAF) is known to disrupt speech fluency.
  • The impact of varying DAF durations and speech rates on fluent speakers requires further investigation.

Purpose of the Study:

  • To investigate the effects of different durations of delayed auditory feedback (DAF) on the speech fluency of normal speakers.
  • To examine how speech rate interacts with DAF to influence dysfluency.
  • To differentiate the effects of DAF on fluent speakers from characteristics of stuttering.

Main Methods:

  • Seventeen participants produced speech under DAF conditions.

Related Experiment Videos

  • Auditory feedback delays of 0, 25, 50, and 200 ms were tested.
  • Speech was recorded at both normal and fast rates.

    • Main Results:

    • A significant increase in dysfluencies (2-3 times more) was observed at the 200 ms DAF delay compared to shorter delays (p<0.05).
    • Speech rate significantly impacted fluency, with more dysfluencies noted at faster rates (p=0.028).
    • Longer DAF delays primarily disrupt the peripheral feedback systems in fluent speakers.

    Conclusions:

    • Long auditory feedback delays disrupt normal speech production by affecting peripheral feedback mechanisms.
    • The pattern of speech disruption under DAF in fluent speakers differs from stuttering, suggesting DAF is not a direct analog.
    • Understanding DAF effects is crucial for speech motor control research and potential therapeutic interventions.