ドーパミンの媒介によるパヴロビアン・コンディショニング中の匂いによって誘発された桃体ポテンシャルの調節
J Amiel Rosenkranz1, Anthony A Grace
1Department of Neuroscience, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA. rosenk@bns.pitt.edu
Nature
|May 17, 2002
まとめ
パブロフのコンディショニングは,桃体 (LAT) の側核のニューロン反応を高めます. ドーパミンは,この感情的な記憶形成に不可欠であり,ニューロン興奮性とシナプス可塑性に影響を与えます.
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.
- 神経生物学 神経生物学とは
背景:
- パブロフの条件付けは,中立な刺激を関連する刺激と関連付け,学習した反応につながります.
- 桃体 (LAT) の側核は,コンディショニング中の感情的記憶形成に不可欠である.
- LATのニューロン活動は,条件付けによって増加し,ドーパミンによって調節されます.
研究 の 目的:
- パブロヴィアン・コンディショニング中のLATにおけるニューロン刺激性とシナプス駆動の変化を調査する.
- これらの神経生理学的変化におけるドーパミンの役割を明らかにする.
主な方法:
- In vivo細胞内記録は,パブロヴィアン条件付け中にラットのLATニューロンで行われました.
- ネズミは,ペアリングされたまたはペアリングされていない匂いと足の衝撃刺激にさらされました.
- ドーパミンの作用を評価するために,ドーパミンの抗体であるハロペリドールを投与した.
主要な成果:
- ペアリングされた匂い・足・ショック・コンディショニングは,LATニューロンのポストシナプス・ポテンシャル (PSP) 応答とニューロンの興奮性を高めました.
- 非ペア化された匂いは,PSP応答の減少につながり,習慣化を示しています.
- ハロペリドールはPSP増強と興奮性の増加を阻害したが,確立されたコンディショニングを逆転させなかった.
結論:
- コンディショニングと習慣化は,LATニューロン活動に相反する効果を誘発する.
- ドーパミンは,LATにおける感情的記憶形成に関連する神経生理学的変化を媒介する上で重要な役割を果たします.
- これらの発見は,感情的記憶プロセスにおけるドーパミンの確立された役割を支持しています.
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