不同强度的Beta tACS不同影响静止状态和运动相关的传感动力功率
Kym Wansbrough1,2,3, Welber Marinovic4, Hakuei Fujiyama1,2,3
1School of Psychology, College of Health and Education, Murdoch University, Perth, WA, Australia.
Frontiers in neuroscience
|June 19, 2025
概括
这项研究发现,在运动准备和终止期间,20 Hz的跨交替电流刺激 (tACS) 对感觉运动振荡的影响不同,对功率和频率的影响取决于强度. 这些发现提供了对运动障碍的tACS神经调节的见解.
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
- 大脑刺激 大脑刺激
背景情况:
- 难以自愿运动的困难对日常生活和自主性产生重大影响.
- 跨交替电流刺激 (tACS) 显示出调节感觉运动β振荡的潜力,这对于自愿运动至关重要.
- 贝塔tACS对振荡功率的确切影响尚不清楚.
研究的目的:
- 研究20 Hzβ tACS不同强度对静止状态和与事件相关的感应运动振荡的影响.
- 探索不同的tACS强度如何影响β振荡功率和频率.
- 了解刺激强度和神经调节效应之间的关系.
主要方法:
- 21名健康成年人接受了四次20分钟的tACS课程,以不同强度 (假,0.5,1.0,1.5mA) 针对左主运动皮质.
- 电脑电图 (EEG) 在休息状态和自动节奏的手指按下按任务期间,在刺激之前和之后被记录下来.
- 分析的重点是传感动力β功率 (13-30 Hz) 和宽带功率 (4-90 Hz) 的变化.
主要成果:
- 与假药相比,在各种刺激强度之间没有观察到静止状态β功率的显著变化.
- 与事件相关的活动显示了强度相关的宽带功率变化:在准备过程中增加了1.0mA功率;在终止过程中减少了0.5mA功率,而在终止过程中增加了1.0和1.5mA功率.
- 1.0 mA刺激在运动执行期间将峰值β频率转移到tACS频率,而tACS前峰值β频率与功率变化有负相关.
结论:
- 在运动的特定阶段 (准备和终止) 中,β tACS强度会影响感觉运动振荡反应.
- 这些发现凸显了tACS诱导的神经调节的强度依赖性.
- 这项研究为优化tACS协议在运动障碍的研究和临床应用提供了宝贵的见解.
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