arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0912.3513q-bio.NCcond-mat.dis-nnnlin.CDphysics.bio-ph
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循环神经网络中依赖于刺激的混沌抑制

Stimulus-Dependent Suppression of Chaos in Recurrent Neural Networks

Kanaka Rajan, L F Abbott, Haim Sompolinsky

摘要:

神经元活动是由神经回路自发产生的持续放电和外部刺激驱动的反应之间的相互作用引起的。使用平均场分析,我们问一个神经网络,内在地产生混沌模式的活动可以保持敏感的外部输入。我们发现,输入不仅驱动网络的反应,他们还积极抑制正在进行的活动,最终导致一个相变,其中混沌被完全消除。在相变的临界输入强度是刺激频率的非单调函数,揭示了一个“共振”频率,在该频率下,即使自发活动的功率谱在零处达到峰值并呈指数下降,输入在抑制混沌方面也是最有效的。我们的分析预测是,神经反应的方差应该在与许多感觉系统操作的范围相匹配的频率处被最强烈地抑制。

英文摘要:

Neuronal activity arises from an interaction between ongoing firing generated spontaneously by neural circuits and responses driven by external stimuli. Using mean-field analysis, we ask how a neural network that intrinsically generates chaotic patterns of activity can remain sensitive to extrinsic input. We find that inputs not only drive network responses, they also actively suppress ongoing activity, ultimately leading to a phase transition in which chaos is completely eliminated. The critical input intensity at the phase transition is a non-monotonic function of stimulus frequency, revealing a "resonant" frequency at which the input is most effective at suppressing chaos even though the power spectrum of the spontaneous activity peaks at zero and falls exponentially. A prediction of our analysis is that the variance of neural responses should be most strongly suppressed at frequencies matching the range over which many sensory systems operate.

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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