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首页> 外文期刊>Journal of Neurophysiology >Responses of neurons in neonatal cortex and thalamus to patterned visual stimulation through the naturally closed lids.
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Responses of neurons in neonatal cortex and thalamus to patterned visual stimulation through the naturally closed lids.

机译：新生儿皮质和丘脑中神经元对通过自然闭合的眼睑形成的图案化视觉刺激的反应。

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摘要

In studies of the developing mammalian visual system, it has been axiomatic that visual experience begins with eye-opening. Any role for neuronal activity earlier in development has been attributed to the patterned spontaneous activity found in retina and lateral geniculate nucleus (LGN). Here we show that, as early as 2 wk before eye-opening, visual stimuli presented through the closed eyelids can drive neuronal activity in LGN and striate cortex of the ferret. At this age, spontaneous activity in cortex is much lower than in LGN, and the visual responses of many cortical, but not geniculate, neurons depend on the orientation of a moving grating. Furthermore the selectivity of cortical neurons to the orientation of gratings presented through the closed eyelids improves with age. Thus neuronal activity patterned by visual experience, rather than by spontaneous retinal activity, is present in visual cortex much earlier than previously thought. This could have important implications for the self-organization of visual cortex.
机译：在对发展中的哺乳动物视觉系统的研究中，视觉体验始于睁大眼睛是不言自明的。在发育早期，神经元活动的任何作用都归因于在视网膜和外侧膝状核（LGN）中发现的模式自发活动。在这里，我们显示出，在睁开眼前2周，通过闭合的眼睑呈现的视觉刺激可以驱动LGN中的神经元活动和雪貂的纹状体皮层。在这个年龄段，皮层的自发活动远低于LGN，许多皮层神经元（而非膝状神经）的视觉反应取决于移动光栅的方向。此外，随着年龄的增长，皮质神经元对通过闭合的眼睑呈现的光栅的方向的选择性提高。因此，由视觉体验而不是自发的视网膜活性所图案化的神经元活动早于以前认为的存在于视觉皮层中。这可能对视觉皮层的自组织具有重要意义。

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