Visual cortex modulates the magnitude but not the selectivity of looming-evoked responses in the superior colliculus of awake mice.

Visual cortex modulates the magnitude but not the selectivity of looming-evoked responses in the superior colliculus of awake mice.
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DOI:
10.1016/j.neuron.2014.08.037
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发表时间:
2014-10-01
期刊:
影响因子:
16.2
通讯作者:
Cang, Jianhua
Cang, Jianhua
中科院分区:
医学1区
文献类型:
--
作者:
Zhao, Xinyu;Liu, Mingna;Cang, Jianhua

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大脑中的神经回路经常接受来自多个来源的输入,例如来自早期处理阶段的自下而上的输入和来自更高阶区的自上而下的输入。在这里,我们研究了自上而下输入在小鼠上丘(SC)中的功能,它接受来自视网膜和视觉皮质的会聚输入。浅层SC中的神经元对模仿接近物体的隐约可见的刺激表现出强大的反应和速度调节。当视觉皮层在清醒状态下被光基因沉默时,隐约可见的诱发反应减少了近一半,但在麻醉的小鼠中却没有。静音皮质不会改变SC神经元隐约可见的速度调整,也不会改变反应时间进程,除非是在最低测试速度下。此外,皮层顶盖输入对SC反应的调节是视网膜组织的。因此,我们揭示的这种效应可能为大脑皮层提供了一种潜在的底物,这是一种进化上的新结构,用于调节SC介导的视觉行为。
Neural circuits in the brain often receive inputs from multiple sources, such as the bottom-up input from early processing stages and the top-down input from higher-order areas. Here, we study the function of top-down input in the mouse Superior Colliculus (SC), which receives convergent inputs from the retina and visual cortex. Neurons in the superficial SC display robust responses and speed tuning to looming stimuli that mimic approaching objects. The looming-evoked responses are reduced by almost half when the visual cortex is optogenetically silenced in awake, but not in anesthetized mice. Silencing the cortex does not change the looming speed tuning of SC neurons, or the response time course except at the lowest tested speed. Furthermore, the regulation of SC responses by the corticotectal input is organized retinotopically. This effect we revealed may thus provide a potential substrate for the cortex, an evolutionarily new structure, to modulate SC-mediated visual behaviors.
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