在手幻象期间,电机唤起的潜在幅度没有减少
Arran T Reader1,2, Sara Coppi2, Victoria S Trifonova2
1Department of Psychology, Faculty of Natural Sciences, University of Stirling, Stirling, UK.
Brain and behavior
|August 7, 2023
概括
手幻觉 (RHI) 没有可靠地降低皮质脊髓刺激能力,用运动唤起的潜能 (MEP) 来衡量. 这表明,运动皮层处理的变化不是RHI的一致结果.
科学领域:
- 神经科学是一个神经科学.
- 心理学 心理学 心理学
- 肉体感官研究研究
背景情况:
- 手幻觉 (RHI) 是一种现象,其中真实手和假手的同步触觉刺激会引起对假肢的身体所有权感.
- 之前的研究表明,RHI可以降低皮质脊髓刺激性,由运动唤起潜能 (MEP) 幅度表明,将运动处理与身体所有权联系起来.
- 然而,这些神经生理变化的可靠性和功能相关性仍在争论中.
研究的目的:
- 为了复制在RHI期间报告的MEP幅度的减少.
- 调查RHI的哪些组成部分可能解释皮质脊髓刺激能力的变化.
- 澄清身体所有权的主观经验与客观神经生理学措施之间的关系.
主要方法:
- 使用单脉冲的横磁刺激 (TMS) 通过MEP振幅来评估皮质脊髓刺激能力.
- 参与者通过同步和异步触觉刺激对他们的真实手和手进行RHI的体验.
- 收集了关于幻觉存在和感知到手部位置变化的主观报告.
主要成果:
- 参与者报告说他们经历了RHI,感知到手的位置向手转移.
- 在RHI期间没有观察到MEP振幅的显著减少.
- 幻觉被成功诱导,但预期的神经生理学相关性缺失.
结论:
- 减少MEP振幅不是RHI的可靠或一致的结果.
- 如果在RHI期间发生运动皮层刺激性变化,它们可能很小并且在功能上没有显著意义.
- 在RHI中,主观身体所有权与运动皮层处理之间的联系可能比以前假设的要弱.
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