Inhibitory stabilization of the cortical network underlies visual surround suppression.

Inhibitory stabilization of the cortical network underlies visual surround suppression.
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DOI:
10.1016/j.neuron.2009.03.028
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发表时间:
2009-05-28
期刊:
影响因子:
16.2
通讯作者:
Ferster, David
Ferster, David
中科院分区:
医学1区
文献类型:
--
作者:
Ozeki, Hirofumi;Finn, Ian M.;Schaffer, Evan S.;Miller, Kenneth D.;Ferster, David

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大脑皮层回路是在什么状态下工作的?我们对猫初级视皮层(V1)环绕抑制的细胞内研究为这个问题提供了强有力的证据。虽然抑制一直被认为是由于侧向抑制的增加而产生的,但我们发现细胞受到的抑制是减少的,而不是增加的,因为周围的刺激。相反,抑制是通过撤销兴奋来调节的。丘脑的记录和以前的工作表明,这些效应不能用丘脑输入的撤回来解释。我们在理论工作中发现,只有当V1作为抑制稳定的网络(ISN)运行时,这种行为才会出现,在ISN中,仅兴奋性重复就足以破坏视觉反应的稳定,而反馈抑制保持稳定。我们从实验上证实了这一情景的两个强有力的测试,并通过模拟表明,从促进到抑制,在环境效应中观察到的细胞到细胞的可变性可以自然地产生于ISN的可变性。
In what regime does the cortical circuit operate? Our intracellular studies of surround suppression in cat primary visual cortex (V1) provide strong evidence on this question. Although suppression has been thought to arise from an increase in lateral inhibition, we find that the inhibition that cells receive is reduced, not increased, by a surround stimulus. Instead, suppression is mediated by a withdrawal of excitation. Thalamic recordings and previous work show that these effects cannot be explained by a withdrawal of thalamic input. We find in theoretical work that this behavior can only arise if V1 operates as an inhibition-stabilized network (ISN), in which excitatory recurrence alone is strong enough to destabilize visual responses but feedback inhibition maintains stability. We confirm two strong tests of this scenario experimentally, and show through simulation that observed cell-to-cell variability in surround effects, from facilitation to suppression, can arise naturally from variability in the ISN.
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