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探究运动想象中运动抑制的时程动态。

Probing the temporal dynamics of movement inhibition in motor imagery.

机构信息

Laboratory for Brain Recovery and Function, School of Physiotherapy, Dalhousie University, Halifax, NS B3H4R2, Canada; Department of Psychology and Neuroscience, Dalhousie University, Halifax, Nova Scotia B3H4R2, Canada.

Department of Psychology and Neuroscience, Dalhousie University, Halifax, Nova Scotia B3H4R2, Canada; Department of Physics & Atmospheric Sciences, Dalhousie University, Halifax, Nova Scotia B3H4R2, Canada.

出版信息

Brain Res. 2019 Oct 1;1720:146310. doi: 10.1016/j.brainres.2019.146310. Epub 2019 Jun 25.

Abstract

Beyond the lack of overt movement in motor imagery (MI), MI is thought to be functionally equivalent to motor execution (ME). Two theories appear viable to explain the neural mechanism underlying the inhibition of movement in MI, with one suggesting the inhibition of movement in MI occurs early in the planning process, and the other suggesting it occurs after the planning for movement is compete. Here we sought to generate evidence related to the timing of movement inhibition in MI. Participants performed a motor task via MI and ME that had distinct preparation and performance phases, with brain activity obtained throughout. Analysis of sensor-level data was performed to isolate event related desynchrony (ERD) in the mu and beta frequency bands in both a sensorimotor and left parietal region of interest (ROI). The magnitude of ERD in the sensorimotor ROI was significantly greater in ME than MI during both the preparatory and performance phases. The reduced ERD in the mu and beta frequency bands in the sensorimotor ROI during the preparatory phase for MI, compared to ME, suggests that movement planning is inhibited (or at least reduced) in MI, contributing to the lack of movement. While past work has shown that the networks of functional brain activity underlying MI and ME are heavily overlapping, differences in the temporal dynamics of this activity suggest that MI and ME are not equivalent processes.

摘要

除了在运动想象(MI)中缺乏明显的运动外,运动想象被认为在功能上等同于运动执行(ME)。有两种理论似乎可以解释 MI 中运动抑制的神经机制,一种理论认为 MI 中的运动抑制发生在计划过程的早期,另一种理论认为它发生在运动计划完成之后。在这里,我们试图产生与 MI 中运动抑制的时间有关的证据。参与者通过 MI 和 ME 执行运动任务,这两种任务具有明显的准备和执行阶段,同时获得了大脑活动。对传感器级别的数据分析表明,在传感器运动和左顶叶感兴趣区域(ROI)中,在 mu 和 beta 频带中可以分离出事件相关去同步(ERD)。在准备和执行阶段,ME 中的传感器运动 ROI 中的 ERD 明显大于 MI。与 ME 相比,在 MI 的准备阶段,传感器运动 ROI 中 mu 和 beta 频带中的 ERD 减少,这表明 MI 中的运动计划受到抑制(或至少减少),这导致了运动的缺乏。虽然过去的工作表明,MI 和 ME 所基于的功能性大脑活动网络高度重叠,但这种活动的时间动态差异表明,MI 和 ME 不是等效的过程。

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