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Functional organization of human sensorimotor cortex for speech articulation
Kristofer E Bouchard1, Nima Mesgarani, Keith Johnson
1Department of Neurological Surgery, University of California, San Francisco, 505 Parnassus Avenue, San Francisco, California 94143, USA.
Nature
|February 22, 2013
Summary
Scientists mapped human speech sensorimotor cortex using high-resolution brain recordings. They discovered dynamic, somatotopic representations of speech articulators organized by phonetic features during syllable production.
Area of Science:
- Neuroscience
- Speech Science
- Motor Control
Background:
- Speaking involves complex, coordinated movements of multiple articulators (lips, jaw, tongue, larynx) on rapid timescales.
- Understanding the neural basis of speech production is crucial for deciphering motor control and potential speech disorders.
Purpose of the Study:
- To investigate the organization of the human speech sensorimotor cortex.
- To reveal how speech articulators are represented and coordinated during syllable production.
Main Methods:
- Utilized high-resolution, multi-electrode cortical recordings in humans.
- Analyzed neural activity during the production of consonant-vowel syllables.
Main Results:
- Identified somatotopic speech-articulator representations on the ventral pre- and post-central gyri, with partial overlap.
- Observed temporal coordination of these representations as sequences during syllable production.
- Revealed emergent population-level representations organized by phonetic features, dynamically transitioning over tens of milliseconds.
Conclusions:
- The speech sensorimotor cortex exhibits a dynamic organization for generating multi-articulator movements.
- Neural activity patterns reflect phonetic features, underlying the effortless production of fluent speech.
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