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Limited Pre-Speech Auditory Modulation in Individuals Who Stutter: Data and Hypotheses
Ludo Max1,2, Ayoub Daliri3
1Department of Speech and Hearing Sciences, University of Washington, Seattle.
Journal of Speech, Language, and Hearing Research : JSLHR
|August 30, 2019
Summary
Adults who stutter show reduced pre-speech auditory modulation (PSAM), impacting speech planning. This suggests inefficient auditory system modulation may contribute to stuttering behaviors.
Area of Science:
- Neuroscience
- Speech Science
- Auditory Processing
Background:
- Speech production involves complex motor planning and auditory feedback processing.
- Individuals who stutter often exhibit differences in speech motor control and auditory processing compared to fluent speakers.
Purpose of the Study:
- To investigate motor-to-auditory influences during speech movement planning in fluent speakers and those who stutter.
- To examine pre-speech auditory modulation (PSAM) and auditory-motor adaptation in these groups.
Main Methods:
- Recorded auditory evoked potentials (AEPs) in response to probe tones during speaking and non-speaking conditions.
- Calculated PSAM as changes in AEP amplitude.
- Assessed auditory-motor adaptation using formant-shifted auditory feedback and delayed auditory feedback.
Main Results:
- Adults who stutter demonstrated significantly reduced PSAM compared to fluent speakers.
- This reduction in PSAM was also observed when participants merely expected to hear their speech.
- Speakers who stutter showed less auditory-motor adaptation and a negative correlation between PSAM and adaptation, unlike fluent speakers.
Conclusions:
- Speech movement planning normally modulates auditory processing for optimal feedback monitoring.
- Adults who stutter may fail to appropriately modulate their auditory system before speech onset.
- This lack of modulation could result in maladaptive feedback-driven corrections, manifesting as stuttering behaviors.
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