Graduate School of Integrated Frontier Sciences, Kyushu University, 4-9-1 Shiobaru, Minami-Ku, Fukuoka City, Fukuoka, Japan.
Research Fellow of the Japan Society for the Promotion of Science, Kojimachi Business Center, Building, 5-3-1 Kojimachi, Chiyoda-Ku, Tokyo, Japan.
J Physiol Anthropol. 2024 Sep 4;43(1):21. doi: 10.1186/s40101-024-00369-0.
Previous studies have reported that the sense of "self" is associated with specific brain regions and neural network activities. In addition, the mirror system, which functions when executing or observing an action, might contribute to differentiating the self from others and form the basis of the sense of self as a fundamental physical representation. This study investigated whether differences in mu suppression, an indicator of mirror system activity, reflect cognitions related to self-other discrimination.
The participants were 30 of healthy college students. The participants observed short video clips of hand movements performed by themselves or actors from two perspectives (i.e., first-person and third-person). The electroencephalogram (EEG) mu rhythm (8-13 Hz) was measured during video observation as an index of mirror neuron system activity. EEG activity related to self-detection was analyzed using participants' hand movements as self-relevant stimuli.
The results showed that mu suppression in the 8-13-Hz range exhibited perspective-dependent responses to self/other stimuli. There was a significant self-oriented mu suppression response in the first-person perspective. However, the study found no significant response orientation in the third-person perspective. The results suggest that mirror system activity may involve self-other discrimination differently depending on the perspective.
In summary, this study examined the mirror system's activity for self and others using the EEG's mu suppression. As a result, it was suggested that differences in self and others or perspectives may influence mu suppression.
先前的研究报告指出，自我意识与特定的大脑区域和神经网络活动有关。此外，镜像系统在执行或观察动作时起作用，可能有助于区分自我和他人，并构成自我意识的基础，即一种基本的物理表现。本研究旨在探讨 mu 抑制（镜像系统活动的一个指标）的差异是否反映了与自我-他人区分相关的认知。
参与者为 30 名健康大学生。参与者从两个视角（第一人称和第三人称）观察自己或演员手部动作的短视频片段。在视频观察期间测量脑电图（EEG）mu 节律（8-13 Hz）作为镜像神经元系统活动的指标。使用参与者的手部运动作为自我相关刺激来分析与自我检测相关的 EEG 活动。
结果表明，mu 抑制在 8-13 Hz 范围内对自我/他人刺激表现出视角依赖性反应。在第一人称视角下，存在显著的自我导向的 mu 抑制反应。然而，在第三人称视角下，没有发现显著的反应方向。这些结果表明，镜像系统活动可能因视角而异，涉及到自我和他人的不同区分。
总之，本研究使用 EEG 的 mu 抑制来检查镜像系统对自我和他人的活动。结果表明，自我和他人或视角的差异可能会影响 mu 抑制。
