A backward progression of attentional effects in the ventral stream
A backward progression of attentional effects in the ventral stream
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DOI：
10.1073/pnas.0907658106
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发表时间：
2010-01-05
影响因子：
11.1
通讯作者：
Desimone, Robert
中科院分区：
文献类型：
--
作者：
Buffalo, Elizabeth A.;Fries, Pascal;Desimone, Robert
行为相关刺激的视觉处理通过自上而下的注意反馈得到增强。一种可能性是反馈首先针对早期的视觉区域，注意力的增强在视觉层次结构的后期逐渐建立起来。另一种可能性是，反馈首先针对较高级别的区域，而注意效应则向后传递到早期的视觉区域。在这里，我们比较了在执行相同任务的相同动物中，V1、V2和V4的注意增强的幅度和潜伏期。我们发现注意效应的顺序相反，即注意增强在V4中较大且较早，在V1中较小且较晚，在V2中结果居中。这些结果表明，注意机制是通过从高阶区域到低阶区域的反馈来运作的。
The visual processing of behaviorally relevant stimuli is enhanced through top-down attentional feedback. One possibility is that feedback targets early visual areas first and the attentional enhancement builds up at progressively later stages of the visual hierarchy. An alternative possibility is that the feedback targets the higher-order areas first and the attentional effects are communicated "backward" to early visual areas. Here, we compared the magnitude and latency of attentional enhancement of firing rates in V1, V2, and V4 in the same animals performing the same task. We found a reverse order of attentional effects, such that attentional enhancement was larger and earlier in V4 and smaller and later in V1, with intermediate results in V2. These results suggest that attentional mechanisms operate via feedback from higher-order areas to lower-order ones.