リモートメモリの検索戦略のダイナミクス
Inbal Goshen1, Matthew Brodsky, Rohit Prakash
1Department of Bioengineering, Howard Hughes Medical Institute, CNC Program, Stanford University, Stanford, CA 94305, USA.
Cell
|October 25, 2011
まとめ
長期記憶のリコールには通常,海馬が関与しますが,この研究はそれが適応できることを示しています. hippocampal CA1ニューロンを一時的に阻害することで,遠隔の恐怖記憶を可逆的に廃止し,記憶の可塑性を明らかにしました.
科学分野:
- 神経科学は神経科学である.
- 記憶の研究 記憶の研究
- システム神経科学 システム神経科学
背景:
- 長期記憶は,ヒポキャンパスと新皮質の連続処理を含むと考えられています.
- 遠隔記憶は一般的に海馬から独立していると考えられています.
- 以前の研究では,文脈的な恐怖の記憶は,時間の経過とともに海馬から独立するようになると示唆されています.
研究 の 目的:
- 遠隔記憶のリコールにヒポキャンパスのCA1刺激性ニューロンのリアルタイムの貢献を調査する.
- メモリリコールメカニズムの可塑性を調べる.
- 遠隔記憶における前帯状皮質 (ACC) の役割を調査する.
主な方法:
- ニューラル活動の精密なリアルタイム操作のための高速光遺傳学的技術を使用しました.
- ヒポキャンパスのCA1ニューロンの一時的に特異的な光遺伝的阻害が,歯類における遠隔の文脈的恐怖記憶リコールに及ぼす影響を調査した.
- 遠隔記憶のリコールにおける前帯状皮質 (ACC) の役割を調査した.
主要な成果:
- 遠隔の文脈的な恐怖記憶のリコールを可逆的に廃止することは,訓練から数週間後でさえ,海馬のCA1ニューロンを光遺伝的に抑制することによって達成されました.
- 薬理学的タイムラインを模倣した拡張抑制により,遠隔記憶のリコールがヒポカンプス依存から独立へと移行した.
- 遠隔記憶のための前帯状皮質 (ACC) の重要性を確認し,ACCの採用にヒポカンパのCA1を関与させた.
結論:
- 遠隔メモリリコールは,厳密にヒポカンプス独立ではなく,ヒポカンプスCA1活動によって逆向きに調節されることがあります.
- 記憶回収メカニズムは可塑性を発揮し,神経基板の適応的なシフトを可能にします.
- 海馬 (CA1) は,ACCのような他の脳領域をリモートメモリリコールに勧誘する役割を果たします.
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