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Contribution of sensory memory to speech motor learning
Takayuki Ito1,2, Jiachuan Bai1, David J Ostry2,3
1Laboratoire de Recherche Grenoble, Images, Parole, Signal, Automatique, Grenoble Institute of Technology, Université Grenoble Alpes, Centre National de la Recherche Scientifique, Grenoble, France.
Journal of Neurophysiology
|September 9, 2020
Summary
Somatic sensory memory, not auditory memory, predicts speech motor learning. This finding highlights the crucial role of touch and body position in adapting speech production.
Area of Science:
- Neuroscience
- Speech Science
- Motor Learning
Background:
- Speech production demands precise motor control and information storage for adaptation.
- Both auditory and somatosensory inputs support speech, suggesting roles for auditory and somatic sensory memory in learning.
- Previous research documented somatic sensory memory's role in limb movement, but its role in speech learning was unclear.
Purpose of the Study:
- To investigate the contribution of auditory and somatic sensory memory to speech motor learning.
- To determine which type of sensory memory predicts adaptation to altered auditory feedback during speech production.
Main Methods:
- Used adaptation to altered auditory feedback as a model for speech motor learning.
- Assessed participants' auditory sensory memory for speech sounds.
- Assessed participants' somatic sensory memory for speech-like facial deformations.
Main Results:
- Somatic sensory memory significantly predicted speech motor learning and adaptation.
- Auditory sensory memory did not predict adaptation to altered auditory feedback.
- Auditory memory for speech sounds was generally better than somatic memory for facial deformations.
Conclusions:
- Somatic sensory memory, rather than auditory sensory memory, provides the crucial memory support for speech motor learning.
- Despite speech's reliance on auditory feedback, somatosensory inputs are key for motor adaptation in speech.
- This study reveals the surprising predictive power of somatic sensory memory in speech learning.
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