Top-down flow of visual spatial attention signals from parietal to occipital cortex.

Top-down flow of visual spatial attention signals from parietal to occipital cortex.
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DOI:
10.1167/9.13.18
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发表时间:
2009-12-16
期刊:
影响因子:
1.8
通讯作者:
Silver MA
Silver MA
中科院分区:
医学4区
文献类型:
--
作者:
Lauritzen TZ;D'Esposito M;Heeger DJ;Silver MA

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鉴于我们的视觉环境的复杂性,选择性地关注某些位置而忽略其他位置的能力对于将视觉信息量减少到可管理的水平和优化行为表现至关重要。持续分配的空间注意力会导致持续增加的功能性磁共振成像(fMRI)信号的部分早期视觉皮层,retinotopically代表出席的位置,即使在没有视觉刺激。在这里,我们测试的假设,地形组织后顶叶皮质区IPS1和IPS2传输自上而下的空间注意信号的早期视觉皮层。我们采用功能磁共振成像和相干性分析来测量持续视觉空间注意过程中皮层区域V1,V2,V3,V3A,V3B,V7,IPS1和IPS2之间的功能连接。注意力增加了枕叶和顶叶皮质许多区域的一致性程度。此外,IPS1和IPS2中的注意力相关活动导致几个视觉皮层区域的活动几百毫秒。这些结果与从IPS1和IPS2到早期视觉皮层的自上而下的空间注意信号的传输是一致的。
Given the complexity of our visual environment, the ability to selectively attend to certain locations, while ignoring others, is crucial for reducing the amount of visual information to manageable levels and for optimizing behavioral performance. Sustained allocation of spatial attention causes persistent increases in functional magnetic resonance imaging (fMRI) signals in portions of early visual cortex that retinotopically represent the attended location, even in the absence of a visual stimulus. Here we test the hypothesis that topographically organized posterior parietal cortical areas IPS1 and IPS2 transmit top–down spatial attention signals to early visual cortex. We employed fMRI and coherency analysis to measure functional connectivity among cortical areas V1, V2, V3, V3A, V3B, V7, IPS1, and IPS2 during sustained visual spatial attention. Attention increased the magnitude of coherency for many pairs of areas in occipital and parietal cortex. Additionally, attention-related activity in IPS1 and IPS2 led activity in several visual cortical areas by a few hundred milliseconds. These results are consistent with transmission of top–down spatial attention signals from IPS1 and IPS2 to early visual cortex.
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