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首页> 外文期刊>The Journal of Neuroscience: The Official Journal of the Society for Neuroscience >Anticipatory suppression of nonattended locations in visual cortex marks target location and predicts perception.
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Anticipatory suppression of nonattended locations in visual cortex marks target location and predicts perception.

机译：预期抑制视觉皮层中无人看管的位置会标记目标位置并预测知觉。

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摘要

Spatial attention is associated with modulations in prestimulus, anticipatory blood oxygen level-dependent (BOLD) activity across the brain. It is unclear, however, if these anticipatory modulations depend on the computational demands of the upcoming task. Here, we show that anticipation of low-contrast stimuli, relative to high-contrast stimuli, is associated with increased prestimulus BOLD activity in the frontal eye field (FEF) and the posterior inferior frontal sulcus (IFS) but not in the intraparietal sulcus (IPS). In visual cortex, anticipation of low-contrast stimuli is associated with increased suppression of activity corresponding to unattended (but not attended) locations, and this suppression predicts whether subjects will accurately perceive low-contrast stimuli. These results suggest that when a stimulus will be difficult to distinguish from the background, top-down signals from FEF and IFS can facilitate perception by marking its location through the suppression of unattended locations invisual cortex.
机译：空间注意力与大脑中刺激，预期血氧水平依赖性（BOLD）活动的调节有关。但是，尚不清楚这些预期的调制是否取决于即将执行的任务的计算需求。在这里，我们表明，相对于高对比度刺激，低对比度刺激的预期与额叶视野（FEF）和后下额沟（IFS）中刺激前的BOLD活动增加有关，而与顶叶内沟（ IPS）。在视觉皮层中，对低对比度刺激的预期与对无人照管（但未有人看管）位置所对应的活动的抑制作用增强相关，并且这种抑制作用可以预测受试者是否会正确地感知低对比度的刺激。这些结果表明，当刺激很难与背景区分开时，来自FEF和IFS的自上而下的信号可以通过抑制无人看管的皮质视口位置来标记其位置，从而有助于感知。

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