Representation of Rapid Image Sequences in V4 Networks.
Representation of Rapid Image Sequences in V4 Networks.
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V4 网络中快速图像序列的表示。
DOI：
10.1093/cercor/bhx146
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Dragoi,Valentin
中科院分区：
文献类型：
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作者：
Fernandez-Leon,JoseA;Hansen,BryanJ;Dragoi,Valentin
自然观察通常包括对不同结构的图像斑块的短暂凝视序列。是否以及如何以时间位置的方式对短暂呈现的顺序刺激进行编码还知之甚少。在这里，我们在非人类灵长类动物(猕猴)的视觉皮质(V4区)进行了多电极记录，观察了7个短暂闪烁的自然图像序列，并测量了有无刺激时线索触发的群体反应之间的相关性。令人惊讶的是，我们发现出现在序列开头和结尾的图像有显著的相关性，但没有发现出现在中间的图像。相关强度随着刺激暴露的增加而增加，并且有利于图像在序列中的位置而不是图像的同一性。这些结果挑战了普遍持有的观点，即图像在视觉皮质中的表现完全基于它们的信息内容，并表明，在缺乏感觉信息的情况下，神经元群体表现出刺激诱发反应的重新激活，其方式反映了刺激序列中的时间位置。
Natural viewing often consists of sequences of brief fixations to image patches of different structure. Whether and how briefly presented sequential stimuli are encoded in a temporal-position manner is poorly understood. Here, we performed multiple-electrode recordings in the visual cortex (area V4) of nonhuman primates (Macaca mulatta) viewing a sequence of 7 briefly flashed natural images, and measured correlations between the cue-triggered population response in the presence and absence of the stimulus. Surprisingly, we found significant correlations for images occurring at the beginning and the end of a sequence, but not for those in the middle. The correlation strength increased with stimulus exposure and favored the image position in the sequence rather than image identity. These results challenge the commonly held view that images are represented in visual cortex exclusively based on their informational content, and indicate that, in the absence of sensory information, neuronal populations exhibit reactivation of stimulus-evoked responses in a way that reflects temporal position within a stimulus sequence.