从运动皮质到Somatosensory皮质5层电路中的两个并行皮质皮质路径的功能动力学和选择性
Hye-Hyun Kim1, Kelly E Bonekamp1,2, Grant R Gillie1,2
1Department of Physiology, Michigan State University, East Lansing, Michigan 48824.
eNeuro
|June 4, 2024
概括
运动皮层 (M1) 与体感皮层 (S1) 神经元的连接表现出明显的短期动态. 这些突触可塑性和神经元响应的差异在胡须系统中的感觉运动集成中形成了形状.
科学领域:
- 神经科学是一个神经科学.
- 系统神经科学 系统神经科学
- 感官系统 感官系统
背景情况:
- 活动感知和感官运动集成依赖于运动皮层 (M1) 和体感官皮层 (S1) 之间的动态相互作用.
- 了解这些相互作用需要详细了解动物胡须系统中的突触连接和神经元反应.
研究的目的:
- 描述S1.1.中M1和不同神经元群体 (第5层的intracelencephalic (IT) 和pyramidal tract (PT) 神经元) 之间的突触连接.
- 为了阐明短期突触动力学如何影响在重复刺激期间的神经元反应和信息处理.
主要方法:
- 结合光遗传学,逆行标记和电生理学在小鼠 (两性) 中.
- 研究了S1 IT和PT神经元对M1输入的突触性质和突触后反应.
主要成果:
- M1突触到S1 IT细胞显示短期抑郁,而突触到PT神经元显示强大的短期促进.
- 尽管有抑郁症,但IT细胞由于动力学较慢而表现出总和,而PT细胞由于重复刺激期间的促进而表现出最小的总和但更大的反应.
- 在不改变时间的情况下,促进M1输入增加了PT细胞的爆破概率.
结论:
- 在S1层5中存在两个平行,动态不同的M1突触激发系统.
- 这些系统通过突触短期动态,突触后神经元类和响应模式来区分,为不同的感觉运动处理途径做出贡献.
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