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Delayed Auditory Feedback Elicits Specific Patterns of Serial Order Errors in a Paced Syllable Sequence Production

Jessica R Malloy1, Dominic Nistal2, Matthias Heyne3

  • 1Program in Neuroscience, Boston University, MA.

Journal of Speech, Language, and Hearing Research : JSLHR
|April 20, 2022
PubMed
Summary

Delayed auditory feedback (DAF) significantly increases speech errors, particularly vowel and syllable repetitions, at delays of 100 ms or more. These findings offer insights into speech planning and production mechanisms under auditory interference.

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Area of Science:

  • Speech Production and Perception
  • Auditory Feedback Mechanisms
  • Speech Motor Control

Background:

  • Delayed auditory feedback (DAF) is known to disrupt speech output, leading to distortions and disfluencies.
  • Previous research on DAF-induced speech errors is limited by small sample sizes and uncontrolled variables, obscuring specific error patterns.
  • Understanding DAF's precise impact on serial order errors is crucial for refining models of speech planning.

Purpose of the Study:

  • To systematically characterize the types of serial order speech errors elicited by DAF.
  • To investigate error patterns in a controlled syllable sequence production task.
  • To analyze the influence of varying DAF delay durations on speech error types and timing.

Main Methods:

  • Sixteen adults repeatedly produced CVCVCV sequences under DAF conditions (0-250 ms delays).
  • Speech recordings were transcribed, and errors were classified based on established slip-of-the-tongue literature.
  • Mixed-effects models analyzed the effects of DAF delay on error types, error timing, and speech rate.

Main Results:

  • DAF significantly increased overall speech error rates at delays of 100 ms and above.
  • Vowel/syllable repetitions, vowel exchanges/omissions, onset disfluencies, and distortions were significantly affected by DAF.
  • Vowel and syllable repetitions emerged as the dominant serial order error types under DAF; errors occurred earlier with longer delays.

Conclusions:

  • DAF elicits a distinct pattern of serial order speech errors, primarily characterized by repetitions.
  • The prevalence of repetition errors suggests DAF influences speech planning representations.
  • Findings align with and inform the GODIVA model of speech planning and production.