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首页> 外文期刊>Neuron >Increased activity in human visual cortex during directed attention in the absence of visual stimulation.
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Increased activity in human visual cortex during directed attention in the absence of visual stimulation.

机译：在没有视觉刺激的情况下，定向注意力期间人类视觉皮层的活动增加。

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摘要

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 distractors 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.
机译：当受试者将注意力转移到视觉场景中的特定位置时，视觉皮层中对该位置出现的刺激的反应会增强，并且附近干扰物的抑制作用也会降低。自上而下的信号是什么，它调制对有人参与和无人参与刺激的响应？在这里，我们证明了当受试者暗中将注意力转移到期待视觉刺激发作的周围位置时，在视神经外皮层皮质缺乏视觉刺激的情况下，与注意力相关的活动增加。在这一预期中，额叶和顶叶区域比视觉区域显示出更强的信号增强。在没有视觉刺激的情况下，视觉皮层活动的增加可能反映了神经信号的自上而下的偏向，有利于从额顶网络获得的参与位置。

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