Corbetta M, Kincade J M, Ollinger J M, McAvoy M P, Shulman G L
Department of Neurology and Neurological Surgery, Washington University School of Medicine, 4525 Scott Avenue, St. Louis, Missouri 63110, USA.
Nat Neurosci. 2000 Mar;3(3):292-7. doi: 10.1038/73009.
Human ability to attend to visual stimuli based on their spatial locations requires the parietal cortex. One hypothesis maintains that parietal cortex controls the voluntary orienting of attention toward a location of interest. Another hypothesis emphasizes its role in reorienting attention toward visual targets appearing at unattended locations. Here, using event-related functional magnetic resonance (ER-fMRI), we show that distinct parietal regions mediated these different attentional processes. Cortical activation occurred primarily in the intraparietal sulcus when a location was attended before visual-target presentation, but in the right temporoparietal junction when the target was detected, particularly at an unattended location.
人类基于视觉刺激的空间位置来关注这些刺激的能力需要顶叶皮层。一种假说认为，顶叶皮层控制注意力向感兴趣位置的自愿定向。另一种假说则强调其在将注意力重新定向到出现在未被关注位置的视觉目标方面的作用。在这里，我们使用事件相关功能磁共振成像（ER-fMRI）表明，不同的顶叶区域介导了这些不同的注意力过程。当在视觉目标呈现之前关注一个位置时，皮层激活主要发生在顶内沟，但当检测到目标时，特别是在未被关注的位置，激活发生在右侧颞顶联合区。
