Increased activity in human visual cortex during directed attention in the absence of visual stimulation
Increased activity in human visual cortex during directed attention in the absence of visual stimulation
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DOI：
10.1016/s0896-6273(00)80734-5
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发表时间：
1999-04-01
期刊：
影响因子：
16.2
通讯作者：
Ungerleider, LG
中科院分区：
文献类型：
--
作者：
Kastner, S;Pinsk, MA;Ungerleider, LG
当受试者将注意力集中到视觉场景中的特定位置时，视觉皮层对该位置处呈现的刺激的反应增强，并且附近干扰物的抑制影响减少。什么是自上而下的信号，调节反应的关注与无人值守的刺激？在这里，我们证明了增加活动相关的注意力在没有视觉刺激的情况下，在纹外皮层时，受试者隐蔽地将注意力集中到一个外围位置，期待视觉刺激的发作。额叶和顶叶区域显示出更强的信号增加，在这一预期比视觉领域。在没有视觉刺激的情况下，视觉皮层的活动增加可能反映了神经信号的自上而下的偏向，有利于关注的位置，这来自额顶叶网络。
When subjects direct attention to a particular location in a visual scene, responses in the visual cortex to stimuli presented at that location are enhanced, and the suppressive influences of nearby distracters are reduced. What is the top-down signal that modulates the response to an attended versus an unattended stimulus? Here, we demonstrate increased activity related to attention in the absence of visual stimulation in extrastriate cortex when subjects covertly directed attention to a peripheral location expecting the onset of visual stimuli. Frontal and parietal areas showed a stronger signal increase during this expectation than did visual areas. The increased activity in visual cortex in the absence of visual stimulation may reflect a top-down bias of neural signals in favor of the attended location, which derives from a fronto-parietal network.