Andreu-Sánchez Celia, Martín-Pascual Miguel Ángel, Gruart Agnès, Delgado-García José María
Neuro-Com Research Group, Department of Audiovisual Communication and Advertising, Universitat Autònoma de Barcelona, Barcelona, 08193, Spain.
Institut de Neurociències, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Barcelona, 08193, Spain.
Sci Rep. 2024 Oct 2;14(1):22921. doi: 10.1038/s41598-024-74453-x.
Mu rhythm (∼8-12 Hz) in the somatosensory cortex has traditionally been linked with doing and seeing motor activities. Here, we aimed to learn how the medium (physical or screened) in which motor actions are seen could impact on that specific brain rhythm. To do so, we presented to 40 participants the very same narrative content both in a one-shot movie with no cuts and in a real theatrical performance. We recorded subjects' brain activities with electroencephalographic (EEG) procedures, and analyzed Mu rhythm present in left (C3) and right (C4) somatosensory areas in relation to the 24 motor activities included in each visual stimulus (screen vs. reality) (24 motor and grasping actions x 40 participants x 2 conditions = 1920 trials). We found lower Mu spectral power in the somatosensory area after the onset of the motor actions in real performance than on-screened content, more pronounced in the left hemisphere. In our results, the sensorimotor Mu-ERD (event-related desynchronization) was stronger during the real-world observation compared to screen observation. This could be relevant in research areas where the somatosensory cortex is important, such as online learning, virtual reality, or brain-computer interfaces.
体感皮层中的缪节律（约8 - 12赫兹）传统上一直与执行和观看运动活动相关联。在此，我们旨在了解观看运动动作的媒介（实体或屏幕）如何影响这种特定的脑节律。为此，我们向40名参与者呈现了完全相同的叙事内容，一次是无剪辑的单部电影，另一次是真实的戏剧表演。我们采用脑电图（EEG）程序记录受试者的大脑活动，并分析左（C3）、右（C4）体感区域中与每个视觉刺激（屏幕与现实）中包含的24种运动活动相关的缪节律（24种运动和抓握动作×40名参与者×2种条件 = 1920次试验）。我们发现，在真实表演中运动动作开始后，体感区域的缪频谱功率低于屏幕呈现的内容，在左半球更为明显。在我们的结果中，与屏幕观察相比，在现实世界观察期间感觉运动缪-事件相关去同步化（Mu-ERD）更强。这可能在体感皮层起重要作用的研究领域中具有相关性，例如在线学习、虚拟现实或脑机接口。
