中部前頭前皮質のニューロンは,恐怖の絶滅の記憶をシグナルします
Mohammed R Milad1, Gregory J Quirk
1Department of Physiology, Ponce School of Medicine, Ponce, Puerto Rico 00732, USA.
Nature
|November 8, 2002
まとめ
絶滅の学習は,恐怖を消すのではなく,新しい記憶を形成します. 中部前頭前皮質にあるインフラリンビック皮質は,恐怖反応を抑制することによって,恐怖の消滅を想起するために重要である.
科学分野:
- 神経科学は神経科学である.
- 行動神経科学は,行動神経科学である.
- 学習と記憶について
背景:
- 恐怖の条件付けと絶滅は,基本的な学習プロセスです.
- 絶滅は恐怖の消去ではなく,新しい記憶の形成を伴うという仮説がある.
- 中間前頭前皮質は,絶滅記憶の長期保存に関与しています.
研究 の 目的:
- 恐怖の絶滅のリコールにおけるインフラリンビックニューロンの役割を調査する.
- 恐怖反応の抑制と関連しているかを判断する.
- 絶滅記憶をシミュレートするために,インフラリンビック皮質刺激の可能性を調査する.
主な方法:
- ネズミの恐怖条件付けと絶滅の際に,下膜皮質のニューラル活動を記録する.
- 恐怖の記憶の測定として凍結行動の評価.
- 恐怖反応に対するその効果を観察するために,インフラリンビック皮質を刺激する.
主要な成果:
- インフラリンビックニューロンは,特定の絶滅時の条件付けトーンに反応して発火した.
- 低凍結レベルは,下下膜神経細胞活動の増加と相関する.
- インフラリムビック皮質の電気刺激は,絶滅記憶を模倣し,絶滅していないネズミの恐怖を軽減しました.
結論:
- 絶滅の学習の強化は,インフラリンビック皮質の活動を強化する.
- この潜在的インフラリンビック活動は,恐怖のシグナルの後の遭遇時に恐怖を抑制する役割を果たします.
- インフラリンビック皮質は,恐怖の記憶のニューラル回路において重要な役割を果たします.
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