Neuronal responses in area 7a to multiple stimulus displays: II. Responses are suppressed at the cued location
Neuronal responses in area 7a to multiple stimulus displays: II. Responses are suppressed at the cued location
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DOI：
10.1093/cercor/11.7.592
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发表时间：
2001-07-01
期刊：
影响因子：
3.7
通讯作者：
Steinmetz, MA
中科院分区：
文献类型：
--
作者：
Constantinidis, C;Steinmetz, MA
日常视觉场景包含各种不同的刺激，其意义各不相同。这篇论文证明了后顶叶皮质(PPC)的神经元能够在多个刺激场景中编码显著刺激的空间位置。本实验试图解决在视觉场景中，注意力被吸引到多个刺激中的一个后，神经元对出现在接受野ACEs中的刺激的反应是如何被调节的。我们从PPC的7a区对猴子进行了记录，这些猴子接受了空间版本的样本匹配任务的训练。结果表明，当刺激出现在先前注意的位置时，神经元的反应受到极大的抑制。在以前出现刺激但没有引起注意的位置，没有观察到响应性的降低。这些结果支持这样一种假设，即7a区具有将注意力重定向到出现在新的、无人看管的位置的刺激的作用。
Everyday visual scenes contain a variety of stimuli that vary in their significance. The companion paper demonstrates that neurons in the posterior parietal cortex (PPC) are capable of encoding the spatial locations of the salient stimulus in multiple stimulus scenes. The present experiment sought to address how neuronal responses to stimuli appearing in the receptive field ace modulated after attention has been drawn to one of multiple stimuli in a visual scene. We recorded from area 7a of the PPC in monkeys trained to do a spatial version of a match-to-sample task. The results show that neuronal responses are greatly suppressed when stimuli appear at previously attended locations. No reduction in responsiveness is observed for locations where stimuli had previously appeared but did not draw attention. These results support the hypothesis that area 7a has a role in redirecting attention to stimuli appearing at novel, unattended locations.