The mirror system is a brain network that gets activated during action performance and observation. Brain mu waves have been used as a mirror system activity index; however, mu rhythm is prone to contamination by occipital alpha wave activity, thus raising a concern regarding its reliability as an index of the mirror system activity. In this study, we investigated whether mu suppression can be used as an index of neurofeedback training, which influences mirror system activities. Participants observed videos of hand movement under three different conditions: central mu feedback (muFB), occipital alpha feedback (aFB), and simple observation without any feedback (OBS). Results showed that at the 4-5 min mark, mu wave was most significantly suppressed in the central site at muFB. We thus demonstrated the possibility of increasing mu wave suppression in feedback training using a specific stimulus such as motion observation.

中文翻译：

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对动作观察期间脑电图mu神经反馈的研究。

镜子系统是在动作执行和观察过程中被激活的大脑网络。脑电波已被用作镜像系统的活动指标。然而，μ节律容易受到枕骨α波活动的污染，因此引起人们对其作为镜系统活动性指标的可靠性的担忧。在这项研究中，我们调查了mu抑制是否可用作神经反馈训练的指标，它影响了镜子系统的活动。参与者在三种不同条件下观察了手部运动的视频：中央mu反馈（muFB），枕骨alpha反馈（aFB）和无任何反馈的简单观察（OBS）。结果表明，在4-5分钟标记处，在muFB的中心部位，mu波被最显着地抑制。