Electrophysiological evidence of global structure-from-motion processing of biological motion in 6-month-old infants
Electrophysiological evidence of global structure-from-motion processing of biological motion in 6-month-old infants
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6 个月大婴儿生物运动的整体运动结构处理的电生理学证据
DOI：
10.1016/j.neuropsychologia.2022.108229
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发表时间：
2022
期刊：
影响因子：
2.6
通讯作者：
Hakuno Yoko
中科院分区：
文献类型：
--
作者：
Hirai Masahiro;Hakuno Yoko
理解他人的行为是驾驭我们的社会世界的一项基本而重要的技能。我们的视觉系统如何对他人的行为敏感的一个显著例子是生物运动（BM）现象，在这种现象中，视觉系统从很少的十二个运动光点中编码有关行为的社会相关信息。先前的研究表明，婴儿可以区分BM和其他类型的动作。然而，目前还缺乏电生理学的证据来说明在生命的第一年里，脑脊膜的整体运动结构处理出现的确切时间点。我们在此展示了一个清晰的事件相关电位（ERP）反应，该反应与6个月大婴儿连贯的人类点光步行者的整体运动结构处理有关。我们引入了一种新的由两个刺激阶段组成的实验范式，以提取与人类相干点光步行者的整体运动结构处理相关的单个ERP分量。此外，我们还证明，在6个月大的婴儿中，连贯的人类点光步行者刺激开始后约482-586 ms时，单个ERP成分的增强大于空间打乱的点光步行者。这些发现表明，6个月大的婴儿可以处理连贯的人类点光步行者的整体运动结构信息，这可能涉及到颞上沟区域的后部。目前的研究结果进一步完善了最近概述的脑基加工发展理论。
Understanding the actions of others is a fundamental and important skill for navigating our social world. A striking example of how our visual system is sensitive to others’ actions is the phenomenon of biological motion (BM), in which the visual system encodes socially relevant information regarding action from as few as a dozen point-lights of motion. Previous studies have demonstrated that infants can discriminate between BM and other types of actions. However, there is a lack of electrophysiological evidence outlining the exact point of time within the first year of life when global structure-from-motion processing of BM emerges. We herein show a clear event-related potential (ERP) response related to the global structure-from-motion processing of a coherent human point-light walker in 6-month-old infants. We introduced a novel experimental paradigm composed of two stimuli phases to extract a single ERP component related to the global structure-from-motion processing of a coherent human point-light walker. Furthermore, we demonstrated that an enhanced single ERP component observed at approximately 482–586 ms following the onset of the stimulus of a coherent human point-light walker was larger than that of a spatially scrambled point-light walker in 6-month-old infants. These findings suggest that 6-month-old infants can process the global structure-from-motion information of a coherent human point-light walker, which may involve the posterior part of the superior temporal sulcus region. The current findings further refine the recently outlined developmental theory of BM processing.