Attention can either increase or decrease spike count correlations in visual cortex.
Attention can either increase or decrease spike count correlations in visual cortex.
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DOI：
10.1038/nn.3835
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发表时间：
2014-11
影响因子：
25
通讯作者：
Cohen, Marlene R.
中科院分区：
文献类型：
--
作者：
Ruff, Douglas A.;Cohen, Marlene R.
视觉注意增强了编码注意位置的视觉神经元的反应。最近的几项研究表明，注意力也会降低神经元对反应波动之间的相关性（称为尖峰计数相关性或rSC）。前面的结果与两个假设是一致的。注意力相关的变化率和rSC可能是联系在一起的（也许通过一个共同的机制），所以注意力总是降低rSC。或者，注意力可能会增加或减少rSC，这可能取决于神经元在行为任务中所扮演的角色。当猴子执行辨别任务时，我们同时记录了V4区的几十个神经元。我们发现了支持第二个假设的有力证据，表明注意力可以灵活地增加或减少相关性，这取决于神经元是否为相同或相反的感知决策提供证据。这些结果对认知因素的神经机制模型提出了重要的限制。
Visual attention enhances the responses of visual neurons that encode the attended location. Several recent studies showed that attention also decreases correlations between fluctuations in the responses of pairs of neurons (termed spike count correlation or rSC). The previous results are consistent with two hypotheses. Attention–related changes in rate and rSC might be linked (perhaps through a common mechanism), so that attention always decreases rSC. Alternately, attention might either increase or decrease rSC, possibly depending on the role the neurons play in the behavioral task. We recorded simultaneously from dozens of neurons in area V4 while monkeys performed a discrimination task. We found strong evidence in favor of the second hypothesis, showing that attention can flexibly increase or decrease correlations, depending on whether the neurons provide evidence for the same or opposite perceptual decisions. These results place important constraints on models of the neuronal mechanisms underlying cognitive factors.
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