慢性的なストレスは前頭前の再編成を引き起こし,意思決定に影響を及ぼします
Eduardo Dias-Ferreira1, João C Sousa, Irene Melo
1Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710-057 Braga, Portugal.
まとめ
慢性的なストレスは,動物を結果に敏感にせず,習慣に依存するようにして意思決定を妨げます. このシフトは,皮質・上皮質の回路における脳の構造的変化と関連しています.
科学分野:
- 神経科学は神経科学である.
- 行動科学は,行動科学である.
- ストレス研究 ストレス研究
背景:
- 意思決定には,行動戦略を柔軟に切り替えることが必要です.
- 慢性的なストレスは,意思決定を含む認知機能に影響することが知られている.
研究 の 目的:
- 慢性的なストレスが意思決定戦略にどのように影響するかを調査する.
- ストレスに起因する行動バイアスの根底にある神経メカニズムを探求する.
主な方法:
- ネズミの2つの異なるオペラントコンディショニングタスクを使用しました.
- 評価された行動反応は,結果の値とアクション・アウトカム・コンティンジェンシーが異なる条件下で評価される.
- 神経解剖学的技術を用いて,前皮質・上皮質回路の構造的変化を調べた.
主要な成果:
- 慢性的なストレスは,結果値の変化に対する無感性につながった.
- ストレスを受けたネズミは,アクション・アウトカム・コンティンジェンシーの変化に対して抵抗性を示した.
- 反対の構造的変化が観察されました:中部前頭前皮質とアソシエーティブ・ストライアトムの縮,センソモーター・ストライアトムの縮.
結論:
- 慢性的なストレスは,習慣的な戦略に向かって意思決定をバイアスします.
- コルチコストリアタル回路の構造的変化は,ストレス誘発の行動不柔軟性を媒介する.
- 研究結果は,慢性ストレスが適応的意思決定に与える有害な影響を強調しています.
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