人間における言語生成の単一ニューロン要素
Arjun R Khanna1, William Muñoz1, Young Joon Kim2
1Department of Neurosurgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
Nature
|January 31, 2024
まとめ
研究者達は 人間の前頭前皮質に 発音の詳細をコードする ニューロンを発見しました これらの脳細胞は 発音のシーケンスや音節構造や 音の組成を追跡し 言語の細胞基盤を明らかにします
科学分野:
- 神経科学
- 言語学
- スピーチ プロダクション
背景:
- 人間の発話には 複雑な発音の動きと 音声の配列が含まれます
- 言語の計画と生成のための 基礎的な神経機構と細胞構造は ほとんど未知のままです
- 言語処理の解読には 言語の神経基盤を理解することが 極めて重要です
研究 の 目的:
- 言語の計画と発音に 関わる 基本的な細胞単位を特定する
- 前頭前野の神経細胞が 音声生成に関連する情報をどのようにコードするかを調査する.
- 言語発音中の神経細胞の組織と活動パターンを解明する.
主な方法:
- ヒトの急性超高密度ニューロピクセルの記録を用いて 皮質の縦横のサンプルを採取した.
- 言語が支配する前頭前皮質における ニューロンの活動を分析した.
- 音声の配列のニューラル・エンコーディング,シラビフィケーション,およびタイムダイナミクスを調べました.
主要な成果:
- 前頭前皮質のニューロンが発見され 計画された単語の 詳細な音声組成と順番をコードします
- 発音イベントのシーケンス,音節のセグメンテーション,そして来る音声/音節のコンポーネントの予測を反映したニューロンを観察した.
- これらのニューロンの集団は,皮質の柱に沿って組織され,計画から生産への移行活動,また知覚を追跡し,話すことと聞くことを区別することが示されました.
結論:
- 前頭前部のニューロンは 言語の音声表現のための 構造化された組織と符号化カスケードを示します
- これらの発見は ヒトの言語の計画と生産を支える 細胞過程を明らかにしています
- この研究は,細胞レベルで人間の言語能力の 神経的基盤についての洞察を提供します.
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