人間の認知における前前頭前皮質の役割
E Koechlin1, G Basso, P Pietrini
1Cognitive Neuroscience Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892-1440, USA.
Nature
|May 21, 1999
まとめ
フロント・ポラー前頭前皮質 (FPPC) は,個人が主目標を維持し,同時にサブゴールを管理することを可能にすることで,複雑な計画をサポートします. この脳の領域は,人間の推論と問題解決能力にとって極めて重要です.
科学分野:
- 神経科学は神経科学である.
- 認知心理学とは,認知心理学である.
- 人間の脳イメージング
背景:
- 複雑な問題解決と計画は,前頭葉,特に前極前頭皮質 (FPPC) に依存しています.
- FPPCの正確な認知機能,特に人間の認知におけるその役割は,まだ完全に理解されていません.
- FPPCは,ヒトでは他の霊長類の種よりも著しく発達しています.
研究 の 目的:
- FPPCによって仲介された複雑な認知作業の基礎にある特定の神経機構を調査する.
- 目標管理におけるFPPCの役割を,作業記憶とデュアルタスクから区別する.
主な方法:
- 機能性磁気共鳴画像 (fMRI) を用いて脳の活動を観察した.
- 参加者は,主要目標と並行するサブゴール,作業記憶,およびデュアルタスクのパフォーマンスを維持する認知プロセスを隔離するために設計されたタスクを実行しました.
主要な成果:
- FPPC内の二国間地域は,参加者が並行して二次的目標と並行して主要な目標を達成した場合にのみ選択的活性化を示しました.
- 持続的な目標維持 (作業記憶) も,連続的な注意移転 (デュアルタスク) も,これらのFPPC領域を独立して活性化しませんでした.
- この発見は,執行機能の重要な側面の特定の神経相関を特定しています.
結論:
- FPPCは,従属目的の探索と処理を同時にしながら,主目的を心に留める認知能力に選択的に関与しています.
- FPPCのこの機能は,複雑な人間の計画と推論能力に不可欠です.
- この研究は,人間に特有の高度な認知機能のための重要な神経基盤を明らかにしています.
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