在听觉皮层中,用于协会性恐惧学习的消毒性微电路
Johannes J Letzkus1, Steffen B E Wolff, Elisabeth M M Meyer
1Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland. johannes.letzkus@fmi.ch
Nature
|December 14, 2011
概括
关联性恐惧记忆的获取依赖于听觉皮层中的消毒性微电路. 这个电路涉及1层内部神经元的胆固醇激活,抑制2/3层神经元,这对学习至关重要.
科学领域:
- 神经科学是一个神经科学.
- 学习和记忆的学习和记忆
- 听觉皮层电路的电路.
背景情况:
- 突触可塑性得到了很好的研究,但学习的神经元电路机制仍然不太了解.
- 研究局部网络中的神经元相互作用如何促进学习过程是必不可少的.
研究的目的:
- 阐明小鼠听觉皮层中关联性恐惧记忆获取背后的电路机制.
- 为了确定特定的神经元类型和相互作用涉及到恐惧学习.
主要方法:
- 在小鼠中利用恐惧调节范式.
- 采用药理和光遗传技术来操纵神经元活动.
- 专注于听觉皮层及其微电路组件.
主要成果:
- 恐惧记忆的获取取决于在听觉皮层中招募一个消毒的微电路.
- 由脚冲击触发的1层内部神经元的胆固醇激活抑制了2/3层的帕瓦胺阳性内部神经元.
- 阻断这种金字塔神经元去抑制,可以防止恐惧学习.
结论:
- 听觉皮层中的刺激趋同是关联性恐惧学习复杂音调所必需的.
- 层1介导的消抑制是新皮质回路中学习和信息处理的关键机制.
- 确定了特定的电路元素,调解听力皮层对恐惧学习的融合.
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