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Distinct neural processes link speech planning and execution
Suseendrakumar Duraivel1,2, Shervin Rahimpour3,4, Katrina Barth1
1Department of Biomedical Engineering, Duke University, Durham, NC, USA.
Nature Human Behaviour
|August 14, 2026
Summary
This study reveals how the brain coordinates speech planning and execution. Distinct brain regions discretely code speech units during planning, which are then integrated to guide continuous motor sequences during execution.
Area of Science:
- Neuroscience
- Cognitive Science
- Speech Production
Background:
- Human communication relies heavily on speech production.
- The neural basis for coordinating speech planning and execution remains incompletely understood.
- A distributed network of brain regions is involved in speaking, but the precise mechanisms are unclear.
Purpose of the Study:
- To elucidate the distinct neural mechanisms underlying speech planning and execution.
- To understand how discrete speech units are represented and integrated during speech production.
- To investigate the dynamic transition from speech planning to motor execution.
Main Methods:
- Utilized intracranial recordings with high spatio-temporal resolution.
- Analyzed neural activity at different spatial scales during speech tasks.
- Investigated neural coding of speech units during planning and execution phases.
Main Results:
- Identified discrete neural coding of different speech units at distinct prefrontal sites during planning.
- Demonstrated dynamic integration of planned speech units across cortical levels.
- Observed continuous motor sequences during execution reflecting discrete units and transitional properties.
Conclusions:
- Speech planning involves discrete coding of speech units in prefrontal cortex.
- Speech execution involves continuous motor sequences generated by speech motor regions.
- A rapid neural transition links discrete planning to continuous execution, enabling fluent speech.
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