Attention improves performance primarily by reducing interneuronal correlations.
Attention improves performance primarily by reducing interneuronal correlations.
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DOI：
10.1038/nn.2439
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发表时间：
2009-12
影响因子：
25
通讯作者：
Maunsell JH
中科院分区：
文献类型：
--
作者：
Cohen MR;Maunsell JH
视觉注意力可以让观察者专注于复杂场景中的重要信息，从而显着提高行为表现。注意力通常也会增加皮质感觉神经元的放电率。速率的增加提高了单个神经元的信噪比，并且这种改进被认为是与注意力相关的行为改善的基础。我们同时记录了视觉区域 V4 中的数十个神经元，发现单个神经元的变化仅占群体敏感性改善的一小部分。相反，超过 80% 的群体信号注意力改善是由神经元对反应的试验间波动之间的相关性降低引起的。这些结果表明，神经元群体中感觉信息的表示以及注意力影响群体敏感性的方式只能通过考虑神经元之间的相互作用来理解。
Visual attention can dramatically improve behavioural performance by allowing observers to focus on the important information in a complex scene. Attention also typically increases the firing rates of cortical sensory neurons. Rate increases improve the signal-to-noise ratio of individual neurons, and this improvement has been assumed to underlie attention-related improvements in behaviour. We recorded dozens of neurons simultaneously in visual area V4 and found that changes in single neurons accounted for only a small fraction of the improvement in the sensitivity of the population. Instead, over 80% of the attentional improvement in the population signal was caused by decreases in the correlations between the trial-to-trial fluctuations in the responses of pairs of neurons. These results suggest that the representation of sensory information in populations of neurons and the way attention affects the sensitivity of the population may only be understood by considering the interactions between neurons.
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