OBJECTIVE During motor execution (ME), mu power is diminished over the contralateral hemisphere and increased over the ipsilateral hemisphere, which has been associated with cortical activation of the contralateral motor areas and inhibition of the ipsilateral motor areas respectively. The influence of action observation (AO) and motor imagery (MI) on mu power is less clear, especially in children, and remains to be studied in children with unilateral cerebral palsy (uCP). METHODS We determined mu power during ME, AO, and MI of 45 typically developing (TD) children and 15 children with uCP over both hemispheres, for each hand. RESULTS In TD children, over the left hemisphere mu power was lowered during ME when the right hand was used. In line, over the right hemisphere mu power was lowered when the left hand was addressed. In addition, during AO and MI increased mu power was observed when the right hand was addressed. In children with uCP, over the spared hemisphere mu power was diminished during ME when the less-affected hand was used. However, over the lesioned hemisphere, no mu changes were observed. CONCLUSIONS The results of TD children fit the activation/inhibition model of mu power. SIGNIFICANCE The results of children with uCP suggest that the lesioned hemisphere is unresponsive to the motor tasks.

中文翻译：

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典型发育儿童和单侧脑瘫儿童在动作观察和运动想象中的侧向脑电图 mu 功率

目的 在运动执行 (ME) 期间，对侧半球的 mu 功率减弱，同侧半球的 mu 功率增加，这分别与对侧运动区的皮质激活和同侧运动区的抑制有关。动作观察 (AO) 和运动想象 (MI) 对 mu power 的影响尚不清楚，尤其是在儿童中，在单侧脑瘫 (uCP) 儿童中仍有待研究。方法 我们确定了 45 名典型发育 (TD) 儿童和 15 名 uCP 儿童在 ME、AO 和 MI 期间的每只手的 mu power。结果 在 TD 儿童中，当使用右手时，在 ME 期间左半球的 mu 功率降低。与此一致，当处理左手时，右半球的 mu 功率会降低。此外，在 AO 和 MI 期间，当处理右手时，观察到 mu 功率增加。在患有 uCP 的儿童中，当使用受影响较小的手时，在 ME 期间，在备用半球上的 mu 功率会减少。然而，在受损半球，没有观察到 mu 变化。结论 TD儿童的结果符合mu power的激活/抑制模型。意义 uCP 儿童的结果表明，受损的半球对运动任务没有反应。