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Probing the temporal dynamics of movement inhibition in motor imagery

机译：探测电动机成像中运动抑制的时间动态

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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.
机译：除了在电动机图像（MI）中缺乏明显的运动，MI被认为是在功能上等同于电机执行（ME）。两种理论看起来可行的是解释MI中运动抑制的神经机制，有一个表明在规划过程中早期发生MI的运动抑制，另一个表明它发生在计划运动之后发生竞争。在这里，我们试图产生与MI中运动抑制的时间相关的证据。参与者通过MI和ME进行了一项机动任务，具有不同的准备和性能阶段，始终获得脑活动。对传感器级数据进行分析，以将事件相关的Desynchrony（ERD）隔离在SensorImotor和左侧兴趣区域（ROI）中的MU和BETA频带中。在准备和性能阶段，在MI中，传感器ROI中的ERD中的ERD的大小明显大于MI。与MI相比，MI的预备阶段在MI的预备阶段中的MU和β频带中的SENSIMOTOR ROI中的SERD减少表明，在MI中抑制了运动计划（或至少减少），有助于缺乏运动。虽然过去的工作表明，MI和MI底层的功能性大脑活动网络严重重叠，但该活动的时间动态的差异表明MI和ME不是等同的过程。

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