Medendorp W Pieter, Goltz Herbert C, Vilis Tutis, Crawford J Douglas
Canadian Institutes of Health Research Group on Action and Perception, Centre for Vision Research, York University, Toronto, Ontario, Canada, M3J 1P3.
J Neurosci. 2003 Jul 16;23(15):6209-14. doi: 10.1523/JNEUROSCI.23-15-06209.2003.
Single-unit recordings have identified a region in the posterior parietal cortex (PPC) of the monkey that represents and updates visual space in a gaze-centered frame. Here, using event-related functional magnetic resonance imaging, we identified an analogous bilateral region in the human PPC that shows contralateral topography for memory-guided eye movements and arm movements. Furthermore, when eye movements reversed the remembered horizontal target location relative to the gaze fixation point, this PPC region exchanged activity across the two cortical lobules. This shows that the human PPC dynamically updates the spatial goals for action in a gaze-centered frame.
单细胞记录已在猴子的后顶叶皮层(PPC)中识别出一个区域,该区域以注视为中心的框架来表征和更新视觉空间。在此,我们使用事件相关功能磁共振成像,在人类PPC中识别出一个类似的双侧区域,该区域在记忆引导的眼动和手臂运动中显示出对侧拓扑结构。此外,当眼动相对于注视固定点反转记忆中的水平目标位置时,这个PPC区域在两个脑叶之间交换活动。这表明人类PPC以注视为中心的框架动态更新行动的空间目标。