Differential cortical processing of local and global motion information in biological motion: An event-related potential study
Differential cortical processing of local and global motion information in biological motion: An event-related potential study
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DOI：
10.1167/8.16.2
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发表时间：
2008-01-01
影响因子：
1.8
通讯作者：
Kakigi, Ryusuke
中科院分区：
文献类型：
--
作者：
Hirai, Masahiro;Kakigi, Ryusuke
为了揭示生物运动加工的神经动力学机制，我们引入了一种新的高尔夫挥杆点光运动（PLM）刺激与适应范式和测量的事件相关电位（ERP）。在适应阶段，PLM和扰频PLM（sPLM）的刺激，静态点光刺激也作为一个控制条件。在随后的测试阶段，呈现PLM或sPLM刺激。我们从测试阶段开始测量ERP。观察到两个负分量，并调制不同：N1分量的振幅显着衰减PLM和sPLM适应刺激相比，静态点光适应刺激，而响应于PLM测试刺激的N2分量的振幅显着衰减只有PLM适应刺激。当使用sPLM或静态适应刺激时，响应于PLM测试刺激的N2分量的幅度显著大于响应于sPLM测试刺激的N2分量的幅度。这些发现表明，N1分量是敏感的局部运动信息，而N2分量是敏感的存在下，一个连贯的形式传达的全球运动。
To reveal the neural dynamics underlying biological motion processing, we introduced a novel golf-swing point-light motion (PLM) stimulus with an adaptation paradigm and measured event-related potentials (ERPs). In the adaptation phase, PLM and scrambled PLM (sPLM) stimuli were presented; a static point-lights stimulus was also presented as a control condition. In the subsequent test phase, PLM or sPLM stimuli were presented. We measured ERPs from the onset of the test phase. Two negative components were observed and modulated differently: the amplitude of the N1 component was significantly attenuated by PLM and sPLM adaptation stimuli compared with the static point-light adaptation stimulus, whereas the amplitude of the N2 component in response to the PLM test stimulus was significantly attenuated only by the PLM adaptation stimulus. The amplitude of the N2 component in response to the PLM test stimulus was significantly larger than that in response to the sPLM test stimulus when a sPLM or static adaptation stimulus was used. These findings indicate that the N1 component is sensitive to local motion information while the N2 component is sensitive to the presence of a coherent form conveyed by global motion.