連続順序のモーター皮質のエンコーディングは,文脈リコールタスクで実行されます.
A F Carpenter1, A P Georgopoulos, G Pellizzer
1Brain Sciences Center, Veterans Affairs Medical Center, Minneapolis MN 55417, USA.
Science (New York, N.Y.)
|March 12, 1999
まとめ
運動皮質のニューラル活動は,メモリタスク中の刺激の連続順序を反映します. これは,モーター皮質が単なる運動コマンドを処理する以上のことを示唆しています.
科学分野:
- 神経科学は神経科学である.
- 認知神経科学とは
- モーター・コントロール・コントロール
背景:
- 猿の運動皮質における連続順序のニューラルエンコーディングを調査した.
- 連続した視覚刺激を含む文脈リコールメモリスキャンタスクを使用しました.
- 猿は,記憶された刺激の順序に基づいて運動反応を行いました.
研究 の 目的:
- 運動皮質における連続順序のニューラルエンコーディングを調査する.
- 運動皮質活動が,メモリタスク中の刺激の配列を反映しているかどうかを判断する.
- 運動皮質が"上部運動ニューロン"のシステムにすぎないという伝統的な見解に異議を唱える.
主な方法:
- 猿は,連続した視覚刺激を含む文脈リコールメモリスキャンタスクを実行した.
- 運動皮質のニューラル活動は,刺激の提示と運動応答の間に記録されました.
- 分析は,神経活動が刺激と運動方向の連続順序とどのように相関するかに焦点を当てた.
主要な成果:
- 刺激のプレゼンテーション中の神経活動の変化は,視覚刺激の連続順番を反映した.
- 運動皮質の活動に対する刺激の連続順の影響は,運動方向の影響と同等であった.
- この効果は,周辺運動イベントの変化がない場合に起きました.
結論:
- 運動皮質は,メモリタスク中に刺激の連続順序を積極的にコードする.
- シリアル・オーダー・プロセッシングは,モーター・エグゼクション以前にさえも,モーター・コルチカル・アクティビティの重要な決定因子である.
- この発見は,単純なモーターコマンドの実行を超えて,モーター皮質の既知の機能を拡張します.
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