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Effects of delayed auditory feedback (DAF) on the pitch-shift reflex
T C Hain1, T A Burnett, C R Larson
1Department of Otolaryngology, Head and Neck Surgery, Northwestern University Medical School, Chicago, Illinois 60611, USA.
The Journal of the Acoustical Society of America
|June 2, 2001
Summary
Auditory feedback changes voice pitch by adjusting vocal fundamental frequency (F0) through the audio-vocal system. Introducing delays in feedback did not alter response timing but confirmed the system
Area of Science:
- Neuroscience
- Auditory Feedback
- Vocal Control
Background:
- The audio-vocal system uses auditory feedback to regulate voice fundamental frequency (F0).
- Previous research suggests this system operates via negative feedback to correct voice errors.
- Understanding the timing-dependent mechanisms of this feedback loop is crucial.
Purpose of the Study:
- To investigate the role of auditory feedback timing in voice pitch regulation.
- To determine how delays in auditory feedback affect the audio-vocal system's response.
- To explore the sensitivity of the audio-vocal system to stimulus onset velocity.
Main Methods:
- Subjects vocalized with delayed auditory feedback (0-500 ms) during pitch-shift stimuli.
- A second experiment used varying feedback delays (100-300 ms) and stimulus onset velocities (330-1000 cents/s).
- A simple feedback model was used to analyze experimental results.
Main Results:
- Delayed auditory feedback did not impact voice F0 response latency or magnitude.
- However, feedback delays shifted the timing of later components of the vocal response.
- The audio-vocal system demonstrated sensitivity to the velocity of stimulus onset.
Conclusions:
- The audio-vocal system actively monitors auditory feedback.
- Closed-loop negative feedback, incorporating delays, adjusts voice F0 to minimize fluctuations.
- Results support the model of audio-vocal control adjusting for unintentional voice errors.