最初の罰の学習中に腹部テグメンタル領域の抑制がなくなると,罰の持続的な無感性が生じます
Shannen Y S Tan1, Michelle H Shen1, Luke J Keevers1
1School of Psychology, UNSW, Sydney, Australia.
まとめ
ベントラル・テグメンタル・エリア (VTA) のドーパミンニューロンにおけるGABAergic抑制は,罰を回避することを学ぶために重要である. このGABA媒介のVTAドーパミンの抑制は,早期の刑罰学習中に,長期的な回避行動に不可欠である.
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.
- 神経薬理学神経薬理学について
背景:
- 適応的行動には,ネガティブな結果を避けることが必要です.
- 腹部タグメンタル領域のドーパミンニューロン (VTADA) のGABAergic阻害は,嫌悪的な結果につながる行動を抑制すると仮定されています.
- 罰則学習におけるドーパミン抑制の正確な役割は完全に理解されていません.
研究 の 目的:
- 罰則学習におけるVTADAニューロンのGABAergic阻害の役割を調査する.
- 回避行動に対するVTADA活動とGABA入力による因果的貢献を決定する.
主な方法:
- ラットでは,VTADA活動とGABA入力を測定するために,繊維光度測定と化学遺伝学が使用されました.
- GABAA受容体をブロックする薬理学的介入が採用されました.
- 処罰学習のさまざまな段階にわたる実験が行われました.
主要な成果:
- VTADA活動とGABAインプットは,応答誘発的結果とともに増加した.
- VTADAの活動は報酬に対してより反応的であり,GABAの投入は初期学習中にショック・ペニッサーに対してより反応的であった.
- 早期の刑罰学習中にGABAA受容体をブロックしたり,VTADAニューロンを活性化したりすると,長期的な回避欠陥が生じます.
結論:
- GABA媒介のVTADA阻害の重要なウィンドウは,刑罰学習中に存在する.
- この早期の抑制は,長期的な回避行動の確立に不可欠です.
- 発見は,適応的意思決定における抑制性神経伝送の重要性を強調しています.
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