经验依赖的内在可塑性在巴雷尔皮质的第四层,在whisking开始时
Molly C Shallow1, Lucy Tian1, Bryan T Higashikubo1
1Department of Biology, Washington University in Saint Louis, Saint Louis, Missouri 63130.
eNeuro
|July 29, 2025
概括
在小鼠中,主动鞭打的出现增加了神经元在皮质皮质的刺激能力,这是一个关键的体感处理区域. 这种依赖于经验的变化在关键的发育时期完善神经回路.
科学领域:
- 神经科学是一个神经科学.
- 感官系统 感官系统
- 发展生物学 发展生物学
背景情况:
- 感官器官的运动控制对于积极的环境探索至关重要.
- 感官器官运动控制对感官皮层发育的影响尚不清楚.
研究的目的:
- 为了调查活跃的鞭打行为是否会影响小鼠体感皮层的发展.
- 探索主动感知与神经电路成熟之间的关系.
主要方法:
- 在小鼠中利用了ex vivo电生理学.
- 检查了神经元内在刺激能力在皮层 (第四层和二/三层) 和视觉皮层.
- 采用预测建模来分析神经元反应.
主要成果:
- 刺激神经元激发能力的短暂增加在皮质层IV中被观察到,在鞭毛开始后立即出现.
- 这种兴奋度的增加是经验依赖的,是叶片特异性的 (第四层),而不是由于突触强度的变化.
- 在皮层或视觉皮层的II/III层中没有发现类似的效果,这表明体感特异性.
结论:
- 活跃的鞭毛发作触发了体验依赖的,在体感皮层中神经元刺激能力的细化.
- 这种暂时增加神经元增益的thalamic输入层可能在皮质成熟和感官处理在关键的发育窗口期间发挥作用.
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