抑制は,覚醒した皮質の感覚反応を支配する
Bilal Haider1, Michael Häusser, Matteo Carandini
1UCL Institute of Ophthalmology, University College London, 11-43 Bath Street, London EC1V 9EL, UK. b.haider@ucl.ac.uk
Nature
|November 23, 2012
まとめ
目覚めているとき,目覚めた脳は,
科学分野:
- 神経科学は神経科学である.
- センサリー処理 センサリー処理
- 皮質活動 皮質活動
背景:
- 皮質の活動は,シナプス刺激と抑制のバランスに依存しています.
- 視覚皮質の反応に関する以前の研究は,麻酔下で実施され,覚醒時の脳機能の理解を制限していました.
- 覚醒状態での自然な視覚刺激中のシナプス活動は,ほとんど不明のままである.
研究 の 目的:
- 麻酔と覚醒したマウスの視覚皮質で視覚的に誘発されたシナプス反応を調査し比較する.
- 異なる皮質状態における感覚処理におけるシナプス刺激と阻害の役割を明らかにする.
主な方法:
- マウスの視覚皮質における全細胞パッチクランプの記録.
- 視覚的に誘発された反応と,その基礎にあるシナプス伝導の測定.
- 麻酔状態と覚醒状態の間の神経活動とシナプス動態の比較.
主要な成果:
- 覚醒したマウスは,麻酔したマウスと比較して,より空間的に選択的で,より短い視覚反応を示した.
- シナプス阻害は,覚醒中の空間的選択性において,麻酔中の状態よりも著しく強く,より幅広く示された.
- 麻酔下では,抑制は興奮の振幅と空間的選択性を反映した.
結論:
- 目覚めた脳の視覚刺激に対する皮質の反応は,主に強く,広く選択的なシナプス阻害によって制御されます.
- この阻害は,視覚皮質における神経活動の空間的広がりと時間的持続を制限する.
- この発見は,覚醒した脳皮質における感覚反応を制御するシナプスメカニズムについての洞察を提供します.
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