基礎側桃体における無条件刺激のニューラル表現は,先天的および学習された応答を媒介する
Felicity Gore1, Edmund C Schwartz1, Baylor C Brangers1
1Department of Neuroscience, Columbia University, New York, NY 10032, USA.
Cell
|July 4, 2015
まとめ
研究者らは,基礎側桃体 (BLA) の特定の細胞を特定し,感情的反応と学習に不可欠な報酬と嫌悪的刺激を表しています. これらの細胞を活性化すると,先天的な行動が誘発され,学習した関連が強化されます.
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.
- 遺伝学 遺伝学とは
背景:
- 桃体,特に下側桃体 (BLA) は,感情的刺激と関連学習の処理における役割が認められています.
- 脳が報酬と嫌悪性の刺激のバレンスをどのようにコードするかを理解することは,感情的反応と学習を説明する鍵です.
研究 の 目的:
- BLAにおける無条件刺激 (USs) を表す,報酬性または嫌悪性を持つニューラル・アンサンブルを遺伝子的に特定し,特徴づけること.
- これらの特定されたBLA細胞集団が先天的な感情的行動と学習された関連を媒介する役割を調査する.
主な方法:
- BLA内の特定のUS反応性細胞集団を標的とし活性化するための遺伝的戦略の開発.
- これらのBLA集合体の活性化後の生理学的および行動的反応の検討.
- 中性刺激とペアリングされたとき,BLA細胞活性化の食欲および嫌悪性学習への影響の評価.
主要な成果:
- BLAにおけるUS反応性細胞の特定の集合体の活性化は,USのバレンスの対応する先天的な生理学的および行動的反応を誘発する.
- これらのBLA細胞組の標的型活性化は,食欲と嫌悪性の学習の両方を成功裏に強化します.
- これらのUS反応性BLA細胞の活性化は,条件付き応答の発現に不可欠であることが示されています.
結論:
- 条件づけられた刺激と無条件刺激の両方のニューラル表現は,BLAのUS反応性細胞集合に収束する.
- これらのBLA細胞集団は,先天的な感情的行動と,刺激に対する学習された反応の両方の重要な仲介者です.
- この発見は,BLAが感覚情報を統合して,感情的,学習プロセスを駆動する方法の細胞基礎を提供する.
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