A neural circuit for spatial summation in visual cortex.

A neural circuit for spatial summation in visual cortex.
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DOI:
10.1038/nature11526
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发表时间:
2012-10-11
期刊:
影响因子:
64.8
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--
中科院分区:
综合性期刊1区
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皮层神经元对感觉刺激的反应受环境的调节。例如,在视觉皮层中,刺激锥体细胞的感受野周围可以减弱细胞对其感受野中心的刺激的反应,这种现象称为周围抑制。皮层回路是否有助于环绕抑制,或者这种现象是否完全来自视觉处理的早期阶段,这是有争议的。在这里,我们发现,与锥体细胞,生长抑素表达抑制性神经元(SOM)在小鼠视觉皮层的表层增加的感受野周围的刺激的反应。这种差异是由于水平皮层轴突优先激发自组织记忆细胞所致。通过扰乱自组织记忆体的活动,我们证明了这些神经元有助于锥体细胞的周围抑制。这些结果建立了环绕抑制的皮层回路,并将特定功能归因于遗传定义的抑制性神经元类型。
The response of cortical neurons to a sensory stimulus is modulated by the context. In the visual cortex, for example, stimulation of a pyramidal cell's receptive field surround can attenuate the cell’s response to a stimulus in its receptive field’s center, a phenomenon called surround suppression. Whether cortical circuits contribute to surround suppression or whether the phenomenon is entirely relayed from earlier stages of visual processing is controversial. Here we discover that, in contrast to pyramidal cells, the response of somatostatin expressing inhibitory neurons (SOMs) in the superficial layers of the mouse visual cortex increases with stimulation of the receptive field surround. This difference results from SOMs' preferential excitation by horizontal cortical axons. By perturbing SOMs’ activity, we demonstrate that these neurons contribute to pyramidal cells' surround suppression. These results establish a cortical circuit for surround suppression and attribute a particular function to a genetically defined type of inhibitory neuron.
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