Ueda Masaya, Ueno Keita, Inamoto Takashi, Shiroma China, Hata Masahiro, Ishii Ryouhei, Naito Yasuo
Graduate School of Comprehensive Rehabilitation, Osaka Prefecture University, Osaka 5838555, Japan.
Rehabilitation Unit, Kyoto University Hospital, Kyoto University, Kyoto 6068507, Japan.
Brain Sci. 2022 Feb 16;12(2):272. doi: 10.3390/brainsci12020272.
Physiological studies have shown that self-body images receive unique recognition processing in a wide range of brain areas, from the frontal lobe to the parietal-occipital cortex. Event-related potential (ERP) studies have shown that the self-referential effect on the image of a hand increases P300 components, but such studies do not evaluate brain oscillatory activity. In this study, we aimed to discover the self-specific brain electrophysiological activity in relation to hand images. ERPs on the fronto-parietal midline were elicited by a three-stimulus visual oddball task using hand images: the self-hand, another hand (most similar to the self-hand), and another hand (similar to the self-hand). We analyzed ERP waveform and brain oscillatory activity by simple averaging and time-frequency analysis. The simple averaging analysis found no significant differences between the responses for the three stimulus tasks in all time windows. However, time-frequency analysis showed that self-hand stimuli elicited high gamma ERS in 650-900 ms at the Cz electrode compared to other hand stimuli. Our results show that brain activity specific to the self-referential process to the self-hand image was reflected in the long latency gamma band activity in the mid-central region. This high gamma-band activity at the Cz electrode may be similar to the activity of the mirror neuron system, which is involved in hand motion.
生理学研究表明，自身身体图像在从额叶到顶枕叶皮质的广泛脑区中接受独特的识别处理。事件相关电位（ERP）研究表明，对手部图像的自我参照效应会增加P300成分，但此类研究并未评估脑振荡活动。在本研究中，我们旨在发现与手部图像相关的自我特异性脑电生理活动。使用手部图像的三刺激视觉oddball任务在额顶中线诱发ERP：自身手部、另一只手（与自身手部最相似）和另一只手（与自身手部相似）。我们通过简单平均和时频分析来分析ERP波形和脑振荡活动。简单平均分析发现在所有时间窗口中，三种刺激任务的反应之间没有显著差异。然而，时频分析表明，与其他手部刺激相比，自身手部刺激在Cz电极处650 - 900毫秒时诱发了高伽马ERS。我们的结果表明，对自身手部图像的自我参照过程所特有的脑活动反映在中中央区域的长潜伏期伽马波段活动中。Cz电极处的这种高伽马波段活动可能类似于参与手部运动的镜像神经元系统的活动。
