ヒポカンプスの協働構造を 堅固な記憶から 柔軟な記憶へと編成する
Giuseppe P Gava1, Laura Lefèvre1, Tabitha Broadbelt1
1Medical Research Council Brain Network Dynamics Unit, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK.
まとめ
マウスの食物記憶を 形成することで ヒッポキャンプスを制限し 物体の位置を 柔軟に記憶することができません 食物記憶形成の過程で この神経活動を抑制することで 柔軟性が回復し ヒポキャンパスのネットワークが 競合する記憶の要求を 管理する方法を明らかにしました
科学分野:
- 神経科学
- 記憶に関する研究
- 計算神経科学
背景:
- 新しい記憶は既存の知識と統合されます
- 連続した記憶は 神経ネットワークに 矛盾する要求を課します
- ヒポキャンプスは 記憶の形成と復元に不可欠です
研究 の 目的:
- ヒポカンプスが 異なる記憶の要求を どう処理するかを調べるためだ
- 記憶の獲得過程における神経集団の活動制約を理解する.
- これらの制約を緩和することで 記憶の柔軟性を回復できるかどうか
主な方法:
- マウスモデルを使って 記憶の形成を研究した
- 記録された海馬集団の活動 (食品の文脈) と (オブジェクトの位置) の記憶タスク.
- 神経活動を調節する 閉環光生抑制を用いた
- スパイクトレインの相関とネットワークのトポロジーを分析した.
主要な成果:
- 強固な (食物関連) 記憶の獲得は,高度に相関する海馬の神経発火を誘発した.
- この相関する活動は,トポロジカルな制約を生み出し,その後の柔軟な (オブジェクト位置) メモリ形成を妨げました.
- 記憶の獲得 (食品関連) の間での光遺伝的抑制は,ニューロンのリクルートメントを減少させ,記憶の柔軟性を回復させた.
結論:
- ヒッポキャンパスのネットワークトポロジーは 関連ニューロンの発火によって特徴付けられ 後の記憶計算を制限することができます
- 脳は 記憶の要求を均衡させるため 神経の協働の 組織的原理を採用します
- 前回の記憶形成による制約を克服することができます.
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