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arXiv 1201.2845q-bio.NCcs.NE
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通过选择性抑制同步的竞争

Competition through selective inhibitory synchrony

Ueli Rutishauser, Jean-Jacques Slotine, Rodney J. Douglas

摘要:

皮质神经元回路的模型通常依赖于抑制反馈来控制增益,提供信号归一化,并使用赢家通吃(WTA)动力学选择性地放大信号。这种模型通常假设兴奋性和抑制性神经元能够容易地相互作用,因为它们的轴突和树突共同定位在同一个小体积中。然而,定量神经解剖学研究的轴突和树突树的神经元在新皮层的尺寸表明,这种共定位的假设是无效的。在本文中,我们描述了一个简单的修改WTA电路设计,允许分布式抑制神经元的影响耦合通过同步,因此允许一个单一的WTA广泛分布在皮层空间,远远超出了任何单一的抑制神经元的树枝状,甚至在不同的皮层区域。我们证明了非线性收缩分析,并通过仿真表明,分布式WTA子系统结合这样的抑制同步是内在稳定的。我们分析表明,同步是大大快于赢家选择。这种电路机制允许独立的WTA网络完全或部分地相互竞争。

英文摘要:

Models of cortical neuronal circuits commonly depend on inhibitory feedback to control gain, provide signal normalization, and to selectively amplify signals using winner-take-all (WTA) dynamics. Such models generally assume that excitatory and inhibitory neurons are able to interact easily, because their axons and dendrites are co-localized in the same small volume. However, quantitative neuroanatomical studies of the dimensions of axonal and dendritic trees of neurons in the neocortex show that this co-localization assumption is not valid. In this paper we describe a simple modification to the WTA circuit design that permits the effects of distributed inhibitory neurons to be coupled through synchronization, and so allows a single WTA to be distributed widely in cortical space, well beyond the arborization of any single inhibitory neuron, and even across different cortical areas. We prove by non-linear contraction analysis, and demonstrate by simulation that distributed WTA sub-systems combined by such inhibitory synchrony are inherently stable. We show analytically that synchronization is substantially faster than winner selection. This circuit mechanism allows networks of independent WTAs to fully or partially compete with each other.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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