MENTAL REPRESENTATIONS OF MOVEMENTS - BRAIN POTENTIALS ASSOCIATED WITH IMAGINATION OF HAND MOVEMENTS
MENTAL REPRESENTATIONS OF MOVEMENTS - BRAIN POTENTIALS ASSOCIATED WITH IMAGINATION OF HAND MOVEMENTS
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DOI：
10.1016/0168-5597(94)00226-5
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发表时间：
1995-03-01
期刊：
影响因子：
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通讯作者：
BERTHOZ, A
中科院分区：
文献类型：
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作者：
BEISTEINER, R;HOLLINGER, P;BERTHOZ, A
本研究旨在为理解运动表象的生理学做出贡献。当受试者想象或执行一系列单侧或双侧手部动作时，记录直流电。这一序列包括向前、向后、向右和向左四个方向的手部运动，不同的试验有不同的动作。这一序列是由计算机屏幕上的可视目标提示的，在试验开始之前必须记住。任务执行和想象之间的DC电位变化定位于中央记录(C3、Cz、C4)，在任务执行时的幅度大于想象时。与任务执行相关的外周感受器的刺激或皮质运动神经系统的不同水平的激活可能解释了这一发现。本研究的主要结果是，单侧动作时，动作手一侧(右手、左手)在感觉运动手区(C3、C4)的记录具有局部化效应，与想象和执行在定性上相同，在数量上相似(即无显著差异)。右手增强的负直流电位在C3中的表现，左手的增强幅度在C4中的表现。这一结果与运动想象激活初级运动皮质的假设是一致的。最后，讨论了运动表象是否在更大程度上涉及左脑，而不是运动的执行。结果表明，只有在严格控制的条件下，与运动想象相关的左半球的特定贡献才能显现出来。
The present study was designed in order to contribute towards the understanding of the physiology of motor imagery. DC potentials were recorded when subjects either imagined or executed a sequence of unilateral or bilateral hand movements. The sequence consisted of hand movements in 4 directions, forwards, backwards, to the right and to the left, and varied from trial to trial. The sequence had been cued by visual targets on a computer screen and had to be memorized before the trial was initiated. Changes of DC potentials between task execution and imagination were localized in central recordings (C3, Cz, C4) with larger amplitudes when executing the task than when imagining to do so. Stimulation of peripheral receptors associated with task execution or a different level of activation of the cortico-motoneural system could account for this finding. The main result of the present study was that with unilateral performance, the side of the performing hand (right, left) had localized effects in recordings over the sensorimotor hand area (C3, C4) which were qualitatively the same with imagination and execution and quantitatively similar (i.e., without significant difference). Performance of the right hand augmented negative DC potentials in C3, performance of the left hand augmented amplitudes in C4. This result is consistent with the assumption that the primary motor cortex is active with motor imagery. Finally, the question has been addressed whether motor imagery may involve the left hemisphere to a larger extent than the execution of the movement. It is shown that a particular contribution of the left hemisphere associated with motor imagery may only show up under strictly controlled conditions.