Shimada Sotaro, Hiraki Kazuo, Oda Ichiro
Department of General System Studies, The University of Tokyo, 3-4-1, Komaba, Meguro-ku, Tokyo, 153-8902, Japan.
Neuroimage. 2005 Feb 15;24(4):1225-32. doi: 10.1016/j.neuroimage.2004.10.039. Epub 2004 Dec 19.
One hypothesis on how we recognize an image of, for example, an arm as our own is through the co-occurrence of multiple sensory feedbacks, especially visual and proprioceptive feedbacks, in this process. It has been suggested that the parietal lobe is the region where proprioceptive and visual information of one's own body is integrated. This study investigated parietal cortical activity during a visual-proprioceptive synchrony judgment task in which visual feedback of the subjects' own passively moving hand was delayed. The subjects were required to judge whether or not there was a delay between the proprioceptive and visual feedbacks. Parietal cortical activity, which was measured using a 48-channel near-infrared spectroscopy (NIRS) apparatus, appeared to be modulated by the length of the delay between the visual and proprioceptive feedbacks. The bilateral superior/middle parietal areas were involved in experiencing the synchrony between the visual and proprioceptive feedbacks, whereas the right inferior parietal areas were strongly activated when discrepancy between the two feedbacks was detected. We postulate that the superior portion of the parietal lobe is essential for maintaining one's own body image, while the right inferior portion is involved in detecting movements of others.
关于我们如何将例如一只手臂的图像识别为自己身体一部分的一种假说，是通过在这个过程中多种感觉反馈（尤其是视觉和本体感觉反馈）的共同出现。有人提出，顶叶是整合自身身体本体感觉和视觉信息的区域。本研究调查了在一个视觉 - 本体感觉同步判断任务中顶叶皮质的活动，在该任务中，受试者自己被动移动手部的视觉反馈被延迟。受试者被要求判断本体感觉和视觉反馈之间是否存在延迟。使用48通道近红外光谱（NIRS）设备测量的顶叶皮质活动，似乎受到视觉和本体感觉反馈之间延迟长度的调节。双侧上/中顶叶区域参与体验视觉和本体感觉反馈之间的同步，而当检测到两种反馈之间的差异时，右侧下顶叶区域会强烈激活。我们推测，顶叶的上部对于维持自身身体形象至关重要，而右侧下部则参与检测他人的动作。
