猿の頭皮質における知覚決定の表現幾何学
Gouki Okazawa1, Christina E Hatch1, Allan Mancoo2
1Center for Neural Science, New York University, New York, NY 10003, USA.
Cell
|June 25, 2021
まとめ
意思決定の過程で 側頭部内部の神経発火率は 逆のパターンを示し 既存のモデルに 異議を唱えます これらの発見は,知覚的意思決定回路における文脈依存の神経表現を示唆しています.
科学分野:
- 神経科学
- 認知神経科学
- 計算神経科学
背景:
- 側頭部内側頭部 (LIP) の神経集合は,競合する行動を含む知覚的決定を表すようにモデル化されています.
- 現在のモデルは,決定変数 (DVs) が同一の競合するアクションを持つタスクに類似してエンコードされていることを示唆しています.
- DVは,行動選択集団のバランスの取れた活動を通じて,部分的に強化された行動計画として表現されていると考えられています.
研究 の 目的:
- 感知的な意思決定のための回路モデルの基本的な原理をテストする.
- LIPニューロンが新しい顔識別タスクで決定をどのように表現するのかを調査する.
- 集団反応の多様性の役割と,その行動表現との連携を探求する.
主な方法:
- LIPニューロンから 顔の識別を記録します
- 神経発火率を分析する 証拠のレベルが変化する
- 反応パターンを従来の動作差別のタスクと比較する.
- LIPと前頭皮における集団反応の多様性を調査する.
主要な成果:
- LIPの発射率は,顔の差別化タスクの裏付けデータで低下し,動きの差別化タスクとは対照的です.
- 反対の反応パターンは 曲線型の集団反応多様体に沿って形成された決定から生じました
- これらのマニフォールドはアクション表現と並べ替えられ,タスクの文脈に基づいて回転しました.
- 側頭前皮質と中頭前皮質で同様の多様体が観察された.
結論:
- 決定変数の表現は,同一の競合するアクションにのみ依存するものではありません.
- 決定の形成に重要な役割を果たし,文脈に依存しています.
- 意思決定回路の表象的幾何学は 異なる脳領域で保存され得る.
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