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Stuttering adults' lack of pre-speech auditory modulation normalizes when speaking with delayed auditory feedback
1Arizona State University, Tempe, AZ, United States.
Summary
Adults who stutter (AWS) have limited auditory modulation and speech learning. Delayed auditory feedback normalized auditory modulation in AWS, suggesting potential therapeutic benefits for stuttering.
Area of Science:
- Neuroscience
- Speech-language pathology
Background:
- Auditory modulation during speech planning is reduced in adults who stutter (AWS).
- The functional relevance of this reduced auditory modulation to speech motor learning is unclear.
Purpose of the Study:
- To investigate the relationship between pre-speech auditory modulation and auditory-motor speech learning in AWS and adults who do not stutter (AWNS).
- To examine the effect of real-time versus delayed auditory feedback (DAF) on pre-speech auditory modulation.
Main Methods:
- Experiment I: Sensorimotor adaptation paradigm to assess auditory-motor speech learning via formant frequency adjustments.
- Experiment II: Electroencephalography (EEG) to measure pre-speech auditory modulation (N1 amplitude) under non-altered auditory feedback (NAF) and DAF conditions.
Main Results:
- AWS demonstrated limited auditory-motor learning, negatively correlated with stuttering frequency.
- AWS exhibited reduced pre-speech auditory modulation, replicated from prior findings.
- DAF decreased auditory modulation in AWNS but increased it in AWS, correlating positively with stuttering frequency.
- AWS showed a negative correlation between pre-speech auditory modulation and auditory-motor learning, unlike AWNS.
Conclusions:
- AWS exhibit deficits in both pre-speech auditory modulation and auditory-motor learning.
- Limited pre-speech auditory modulation is not directly linked to impaired auditory-motor adaptation in AWS.
- Delayed auditory feedback may paradoxically normalize pre-speech auditory modulation in adults who stutter.
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