Two distinct types of remapping in primate cortical area V4.
Two distinct types of remapping in primate cortical area V4.
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DOI：
10.1038/ncomms10402
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发表时间：
2016-02-01
影响因子：
16.6
通讯作者：
Pack CC
中科院分区：
文献类型：
--
作者：
Neupane S;Guitton D;Pack CC
视觉神经元通常从视网膜的有限部分接收信息，而这种感受野是大部分视觉皮层的关键组织原则。同时，有强有力的证据表明，感受野在眼跳期间会发生短暂的变化。这种转变的性质是有争议的：之前的研究发现这种转变与知觉恒常性的作用一致。其他研究表明其在空间注意力分配中发挥作用。在这里，我们提供的证据表明，先前记录的这两种功能都存在于灵长类动物皮层 V4 区的单个神经元中。与知觉恒定性相关的重新映射发生在所有方向的眼跳中，而注意力转移主要发生在与眼跳终点位于同一半场的感受野的神经元上。后者相对缓慢，甚至在扫视计划期间也可以观察到。总的来说，这些结果表明在眼跳执行过程中视觉和视网膜外影响之间存在复杂的相互作用。 众所周知，视觉感受野会在扫视期间改变位置，但这种重新映射的性质尚不清楚。 Neupane 及其同事在此表明，视觉皮层 V4 区的神经元表现出两种类型的重新映射，一种与维持知觉稳定性的作用一致，另一种似乎反映了注意力的转移。
Visual neurons typically receive information from a limited portion of the retina, and such receptive fields are a key organizing principle for much of visual cortex. At the same time, there is strong evidence that receptive fields transiently shift around the time of saccades. The nature of the shift is controversial: Previous studies have found shifts consistent with a role for perceptual constancy; other studies suggest a role in the allocation of spatial attention. Here we present evidence that both the previously documented functions exist in individual neurons in primate cortical area V4. Remapping associated with perceptual constancy occurs for saccades in all directions, while attentional shifts mainly occur for neurons with receptive fields in the same hemifield as the saccade end point. The latter are relatively sluggish and can be observed even during saccade planning. Overall these results suggest a complex interplay of visual and extraretinal influences during the execution of saccades. Visual receptive fields are known to change positions around the time of a saccade, but the nature of this remapping is unclear. Here Neupane and colleagues show that neurons in area V4 of the visual cortex exhibit two types of remapping, one consistent with a role in maintaining perceptual stability, and a second that seems to reflect shifts of attention.