Neural systems for visual orienting and their relationships to spatial working memory
Neural systems for visual orienting and their relationships to spatial working memory
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DOI：
10.1162/089892902317362029
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发表时间：
2002-04-01
影响因子：
3.2
通讯作者：
Shulman, GL
中科院分区：
文献类型：
--
作者：
Corbetta, M;Kincade, JM;Shulman, GL
我们使用事件相关功能磁共振成像（fMRI）研究了人类视觉定向的神经相关性。当受试者自愿将注意力集中到周边位置时，我们记录了来自顶内沟（IP）和上级额叶皮层（靠近额叶眼野，FEF）的独特的鲁棒和持续的信号。在腹侧IP和FEF中，血氧水平依赖性信号仅受到注意方向的调制。在7秒的延迟期间，当受试者在外围线索位置（工作记忆）保持注意力时，IN和FEF也保持最持续的激活水平。因此，IP和FEF形成了一个控制视觉空间注意的内源性分配和维持的背侧网络，一个单独的右半球网络被无人注意位置的目标检测激活，激活在很大程度上独立于目标的位置（视野）。这个网络包括右颞顶交界处和额下回等区域。我们建议，这个皮质网络是重要的重新定位到感觉事件。
We investigated neural correlates of human visual orienting using event-related functional magnetic resonance imaging (fMRI). When subjects voluntarily directed attention to a peripheral location, we recorded robust and sustained signals uniquely from the intraparietal sulcus (IPs) and superior frontal cortex (near the frontal eye field, FEF). In the ventral IPs and FEF only, the blood oxygen level dependent signal was modulated by the direction of attention. The IN and FEF also maintained the most sustained level of activation during a 7-sec delay, when subjects maintained attention at the peripheral cued location (working memory). Therefore, the IPs and FEF form a dorsal network that controls the endogenous allocation and maintenance of visuospatial attention, A separate right hemisphere network was activated by the detection of targets at Unattended locations, Activation was largely independent of the target's location (visual field). This network included among other regions the right temporo-parietal junction and the inferior frontal gyrus. We propose that this cortica l network is important for reorienting to sensory events.