火花随着距离的增长而消失:电场分布对使用不同的tES技术对全球运动感知的影响
Andrea Pavan1, Filippo Ghin2, Adriano Contillo3
1University of Bologna, Department of Psychology, Bologna, Italy; University of Lincoln, School of Psychology, Lincoln, United Kingdom.
概括
在跨电刺激 (tES) 期间改变电极位置会影响大脑活动和视觉运动感知. 电极之间的距离增加会改变电流流量,影响神经调节的有效性.
科学领域:
- 神经科学是一个神经科学.
- 认知科学 认知科学
- 生物医学工程 生物医学工程
背景情况:
- 跨电刺激 (tES) 调节大脑活动和行为.
- 之前的研究表明,用脑部组合的高频跨脑随机噪声刺激 (hf-tRNS) 降低了运动一致性值.
- 脑外装配提供了一个替代方案,通过避免在返回电极下的刺激.
研究的目的:
- 为了研究不同的tES协议对视觉运动歧视的影响,使用脑外组合.
- 评估如何改变电极定位,特别是增加电极间距离,影响神经调节效应.
- 为了比较hf-tRNS,阳极/阴极跨直流刺激 (tDCS) 和hMT+区域的假刺激.
主要方法:
- 参与者通过使用随机点影像图 (RDK) 进行视觉运动区分任务.
- 在hMT+区域使用hf-tRNS,阳极/阴极tDCS和假条件进行了刺激.
- 返回电极被放置在ipsilateral手臂上,与头脑组装相比,增加了电极间的距离.
主要成果:
- 电极间距离的增加改变了目标皮层区域内的电流流特性,包括分布和焦点.
- 电流流中的这些变化导致了对运动歧视的不同神经调节效应.
- 没有观察到阳极tDCS,阴极tDCS或假刺激与测试的脑外组合的显著影响.
结论:
- 电极组装配置显著影响tES对认知表现的神经调节效应.
- 电极间距离的变化可以改变电场,改变电流流量并影响刺激结果.
- 未来的研究应该在脑刺激研究中仔细考虑刺激组合参数.
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