Top-down versus bottom-up control of attention in the prefrontal and posterior parietal cortices
Top-down versus bottom-up control of attention in the prefrontal and posterior parietal cortices
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DOI：
10.1126/science.1138071
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发表时间：
2007-03-30
期刊：
影响因子：
56.9
通讯作者：
Miller, Earl K.
中科院分区：
文献类型：
--
作者：
Buschman, Timothy J.;Miller, Earl K.
注意力可以通过任务需求产生的"自上而下"信号自愿地集中，也可以通过显著刺激产生的"自下而上"信号自动地集中。额叶和顶叶皮质也参与其中，但它们的神经活动还没有被直接比较。因此，我们在猴子身上同时记录了它们。在自上而下的注意中，前额叶神经元首先反映目标位置，而在自下而上的注意中，顶叶神经元更早地发出信号。额叶和顶叶区域之间的同步性在自上而下的注意中在较低的频率下更强，而在自下而上的注意中在较高的频率下更强。这一结果表明，自上而下和自下而上的信号分别来自额叶和感觉皮层，不同的注意模式可能会强调不同频率的同步性。
Attention can be focused volitionally by "top-down" signals derived from task demands and automatically by "bottom-up" signals from salient stimuli. The frontal and parietal cortices are involved, but their neural activity has not been directly compared. Therefore, we recorded from them simultaneously in monkeys. Prefrontal neurons reflected the target location first during top-down attention, whereas parietal neurons signaled it earlier during bottom-up attention. Synchrony between frontal and parietal areas was stronger in lower frequencies during top-down attention and in higher frequencies during bottom-up attention. This result indicates that top-down and bottom-up signals arise from the frontal and sensory cortex, respectively, and different modes of attention may emphasize synchrony at different frequencies.