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The role of the supplementary motor area (SMA) in word production
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The supplementary motor area (SMA) is a key structure for behavioral planning and execution. Recent research on motor control conducted with monkeys and humans has put to light an anatomical and functional distinction between pre-SMA and SMA-proper. According to this view, the pre-SMA would be involved in higher level processes while the SMA-proper would be more closely tied to motor output. We extended this general framework to the verbal domain, in order to investigate the role of the SMA in speech production. We conducted two speech production experiments with fMRI where we manipulated parameters such as familiarity, complexity or constraints on word selection. The results reveal a parcellation of the SMA into three distinct regions, according to their involvement in different aspects of word production. More specifically, following a rostrocaudal gradient, we observed differential activations related to lexical selection, linear sequence encoding and control of motor output. A parallel organization was observed in the dorsolateral frontal cortex. By refining its anatomical and functional parcellation, these results clarify the roles of the SMA in speech production.
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“A rostrocaudal gradient distinction was made between the pre-SMA and the more posterior SMA-proper: During silent articulation, the pre-SMA was associated with sequencing abstract motor plans while the SMA-proper was associated with the control of motor output (Alario et al., 2006).”
From A review and synthesis of the first 20years of PET and fMRI studies of heard speech, spoken language and reading (2012) · cites this paper as Alario et al., 2006
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Metadata
- Authors
- Alario, F.-X., Chainay, H., Lehericy, S., & Cohen, L.
- Affiliations
- Centre National de la Recherche Scientifique (FR)
- Université de Bretagne Occidentale (FR)
- Inserm (FR)
- Corresponding author
- Alario, F.-Xavier
- Venue
- Brain Research
- Publisher
- Elsevier BV
- Published
- 2006-03
- Volume
- 1076
- Issue
- 1
- Pages
- 129-143
- ISSN
- 0006-8993 (ISSN-L)
- OpenAlex
- W2085757311
- Cited by
- 377
- References
- 88
- Citations by year
- 2026: 19 · 2025: 23 · 2024: 21 · 2023: 20 · 2022: 24 · 2021: 22 · 2020: 20 · 2019: 20 · 2018: 21 · 2017: 18 · 2016: 22 · 2015: 26 · 2014: 14 · 2013: 16 · 2012: 20
- FWCI
- 6.31
- Type
- journal article
- Language
- en
- Open access
- green
- hal.science
- Licence
- Locations
- Brain Research (publishedVersion)
- PubMed (publishedVersion)
- HAL AMU (submittedVersion, other-oa)
- HAL (submittedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neurobiology of Language and Bilingualism
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Phonetics and Phonology Research
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
- Keywords
- supplementary motor area, speech production, word production, pre-supplementary motor area, rostrocaudal gradient, word choice, dorsolateral prefrontal cortex, functional parcellation, word familiarity, word complexity
- MeSH terms
- Adult, Brain Mapping, Choice Behavior, Female, Humans, Image Processing, Computer-Assisted, Magnetic Resonance Imaging, Male, Motor Cortex, Oxygen, Photic Stimulation, Reading, Time Factors, Verbal Behavior
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