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High-Frequency, Long-Range Coupling Between Prefrontal and Visual Cortex During Attention

机译:注意期间前额叶和视皮层之间的高频远程耦合

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摘要

Electrical recordings in humans and monkeys show attentional enhancement of evoked responses and gamma synchrony in ventral stream cortical areas. Does this synchrony result from intrinsic activity in visual cortex or from inputs from other structures? Using paired recordings in the frontal eye field (FEF) and area V4, we found that attention to a stimulus in their joint receptive field leads to enhanced oscillatory coupling between the two areas, particularly at gamma frequencies. This coupling appeared to be initiated by FEF and was time-shifted by about 8 to 13 milliseconds across a range of frequencies. Considering the expected conduction and synaptic delays between the areas, this time-shifted coupling at gamma frequencies may optimize the postsynaptic impact of spikes from one area upon the other, improving cross-area communication with attention.
机译:人类和猴子的电记录显示出注意力增强了腹侧皮质区域的诱发反应和伽马同步。这种同步是由于视觉皮层的固有活动还是其他结构的输入引起的?使用额叶视场(FEF)和区域V4中的配对记录,我们发现,注意其关节感受野中的刺激会导致两个区域之间的振荡耦合增强,尤其是在伽马频率下。这种耦合似乎是由FEF启动的,并且在一定频率范围内时移了大约8到13毫秒。考虑到区域之间的预期传导和突触延迟,这种在伽马频率上的时移耦合可以优化尖峰从一个区域到另一个区域对另一区域的突触后影响,从而提高跨区域通信的效率。

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