在麻醉的子中,TMS诱导的皮层脊髓轴突对不同电流方向的反应
Isabel S Glover1, Steve A Edgley2, Stuart N Baker1
1Biosciences Institute, Newcastle University, Framlington Place, Newcastle upon Tyne, NE2 4HH, United Kingdom.
Cerebral cortex (New York, N.Y. : 1991)
|February 17, 2026
概括
跨磁刺激 (TMS) 根据电流方向选择性地激活不同的皮质脊髓电流. 前后电流优先刺激直接波,而前后电流则刺激后期间接波.
科学领域:
- 神经科学是一个神经科学.
- 发动机控制器的控制器
- 电子生理学 电子生理学
背景情况:
- 应用到主要运动皮层 (M1) 的跨体磁刺激 (TMS) 引发皮质脊髓电流,包括直接 (D) 和间接 (I) 波.
- 由于变化TMS线圈方向,这些波的偏好刺激的精确单细胞机制尚不清楚.
研究的目的:
- 为了研究焦点TMS诱导的皮质脊髓发射的单细胞机制.
- 要确定线圈方向是否影响D波和I波的选择性激活.
主要方法:
- 在麻醉的子中,在C5处记录了249个皮质脊髓轴突的响应,这些子使用了M1的焦点TMS.
- 用后前 (PA) 和前后 (AP) 两种不同强度的诱导电流来管理TMS.
主要成果:
- PA和AP电流都产生了D,早期间接 (I1) 和晚期I波.
- 温和的PA电流选择性地产生D波,而温和的AP电流选择性地产生晚期I波.
- 大多数轴突在中等强度的单个延迟窗口 (D,I1,或晚期I) 中响应;多个窗口的响应随着强度的增加而增加,特别是对于AP刺激.
- 在响应AP TMS的轴突中观察到更快的传导速度在I延迟后期.
结论:
- 焦点TMS可以通过调整线圈的方向和强度来选择性地激活特定的皮层脊髓波 (D波或晚期I波).
- 这些发现为焦点TMS的神经机制及其与皮质脊髓管的相互作用提供了详细的见解.
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