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論文
- タイトル
- タイトル（英）
- Temporal dynamics of the sensorimotor convergence underlying voluntary limb movement
- 参照URL
- https://researchmap.jp/kore2460/published_papers/40557391
- 著者
- 著者（英）
- Tatsuya Umeda,Tadashi Isa,Yukio Nishimura
- 担当区分
- 概要
- 概要（英）
- Descending motor drive and somatosensory feedback play important roles in modulating muscle activity. Numerous studies have characterized the organization of neuronal connectivity in which descending motor pathways and somatosensory afferents converge on spinal motor neurons as a final common pathway. However, how inputs from these two pathways are integrated into spinal motor neurons to generate muscle activity during actual motor behavior is unknown. Here, we simultaneously recorded activity in the motor cortices (MCx), somatosensory afferent neurons, and forelimb muscles in monkeys performing reaching and grasping movements. We constructed a linear model to explain the instantaneous muscle activity using the activity of MCx (descending input) and peripheral afferents (afferent input). Decomposition of the reconstructed muscle activity into each subcomponent indicated that muscle activity before movement onset could first be explained by descending input from mainly the primary motor cortex and muscle activity after movement onset by both descending and afferent inputs. Descending input had a facilitative effect on all muscles, whereas afferent input had a facilitative or suppressive effect on each muscle. Such antagonistic effects of afferent input can be explained by reciprocal effects of the spinal reflex. These results suggest that descending input contributes to the initiation of limb movement, and this initial movement subsequently affects muscle activity via the spinal reflex in conjunction with the continuous descending input. Thus, spinal motor neurons are subjected to temporally organized modulation by direct activation through the descending pathway and the lagged action of the spinal reflex during voluntary limb movement.
- 出版者・発行元
- 出版者・発行元（英）
- Proceedings of the National Academy of Sciences
- 誌名
- 誌名（英）
- Proceedings of the National Academy of Sciences
- 巻
- 119
- 号
- 48
- 開始ページ
- 終了ページ
- 出版年月
- 2022年11月29日
- 査読の有無
- 招待の有無
- 掲載種別
- 研究論文（学術雑誌）
- ISSN
- 0027-8424
- DOI URL
- https://doi.org/10.1073/pnas.2208353119
- 共同研究・競争的資金等の研究課題
研究者
西村 幸男
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