运动皮质中的反赫比塑性促进了防御性结
Yang Bai1, Bryce Grier1, Erez Geron1
1Neuroscience Institute, New York University, New York, NY 10016, USA.
Current biology : CB
|August 5, 2023
概括
初级运动皮层 (M1) 中的神经元通过削弱活跃连接来对恐惧线索产生负面反应. 这种神经可塑性通过减少运动促进,有助于结行为.
科学领域:
- 神经科学是一个神经科学.
- 细胞神经科学 细胞神经科学
- 系统神经科学 系统神经科学
背景情况:
- 区域性大脑活动往往会因应外部事件而减少.
- 这些负面神经元反应的发展背后的机制尚不清楚.
- 恐惧调节提供了一个模型来研究初级运动皮质 (M1) 中负面反应的出现.
研究的目的:
- 研究主要运动皮层 (M1) 中的神经元如何在学习恐惧后产生负面反应.
- 阐明推动这些负面反应的突触机制.
- 了解这些负面反应在调解结行为中的作用.
主要方法:
- 在老鼠的古典恐惧调节.
- 在体内两光子显微镜用于监测神经元活动与突触分辨率.
- 对CaMKII活性进行光遗传学操纵,以研究可塑性机制.
主要成果:
- 主要运动皮层5层金字塔神经元 (L5 PNs) 在恐惧调节后一个小时内产生了负音响.
- 这些负面反应取决于训练期间活跃的树突脊柱的削弱.
- 抑制这种反赫布斯可塑性破坏了负音响和结行为.
结论:
- 在记忆编码过程中,活跃的树突棘的削弱导致了M1中神经元的负面反应.
- 这些负面反应降低了M1促进移动的能力,促进了结.
- 这项研究为特定区域对突出线索的负面反应提供了机制性的解释.
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