急速なピークを起こす細胞を駆動すると,ガンマリズムが誘発され,感覚反応が制御されます
Jessica A Cardin1, Marie Carlén, Konstantinos Meletis
1McGovern Institute for Brain Research and Department of Brain and Cognitive Sciences, MIT, Cambridge, Massachusetts 02139, USA.
Nature
|April 28, 2009
まとめ
科学者たちは,集中した注意力にとって極めて重要なガンマ振動を生成する際の急速なスパイクを持つ内ニューロンの役割を因果的にテストした. これらの特定のニューロンを活性化すると,ガンマ活性が増幅され,脳の機能と疾患における中心的な役割をサポートします.
科学分野:
- 神経科学は神経科学である.
- 計算神経科学とは
- 細胞神経科学は細胞神経科学である.
背景:
- 皮質のガンマ振動 (20〜80 Hz) は,集中した注意と関連しており,神経学的/精神学的障害において損なわれています.
- 既存の理論では,急速なスパイクを起こす阻害性内ニューロンが,同期リズム阻害によってガンマ振動を生成することを提案している.
- このリズム阻害は,ニューラル・アンサンブル・シンクロニーを作り出し,効果的な興奮を可能にすると仮定されています.
研究 の 目的:
- 急速なスパイクするインターニューロンが皮質のガンマ振動を生成するという仮説を因果的にテストするために.
- ネットワークの振動に対するインターニューロンとピラミッドニューロンの細胞型特異的な貢献を調査する.
- 細胞型特異の活性化が,体内で異なるネットワーク活動状態を誘発できるかどうかを判断する.
主な方法:
- In vivo optogenetic マニピュレーションは,バレル皮質の急速なスパイクインテレニューロンをターゲットにします.
- 8~200Hzの周波数帯で急速なスパイクする内ニューロンの活性化.
- 内ニューロン活性化によるガンマ振動増幅の比較とピラミッド型のニューロン活性化.
主要な成果:
- さまざまな周波数で高速にピークする内ニューロンの選択的な光駆動活性化により,ガンマ振動が増幅されます.
- ピラミッド神経細胞の活性化により,選択的に低い周波数の振動が増幅され,細胞タイプ特有の解離が示されました.
- ガンマサイクルの相対的な感覚インプットのタイミングは,喚起された神経応答の幅度と精度に影響を与えました.
結論:
- ガンマ振動生成のための急速なスパイクインテレウロン-ガンマ仮説を直接サポートしています.
- 細胞型特異の活性化が,体内において異なるネットワーク活動状態を誘発できるという最初の因果的証拠を提供する.
- ネットワークのダイナミクスと注意の形成におけるインターニューロン-ピラミダル細胞の相互作用の重要な役割を強調しています.
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