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arXiv 1801.01362q-bio.NCcond-mat.dis-nn
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神经脉冲序列低变异性的一个简单模型

A simple model for low variability in neural spike trains

Ulisse Ferrari, Stephane Deny, Olivier Marre, Thierry Mora

摘要:

神经噪声限制了感觉系统中的信息传输。在几个领域,尖峰响应(重复刺激)表现出更高程度的规律性比预测的泊松过程。然而,仍然缺乏一个简单的模型来解释这种低变异性。在这里,我们介绍了一个新的模型,与泊松统计的校正,它可以准确地预测神经脉冲序列的规律性,在响应于重复刺激。该模型只有两个参数,但可以重现在各种条件下视网膜记录中观察到的变化。我们分析表明,为什么这种近似可以工作。在一个模型的尖峰发射过程中,假设一个不应期,我们得出,我们的简单的校正可以很好地近似的脉冲序列统计在很宽的范围内的放电率。我们的模型可以很容易地插入刺激处理模型,如线性-非线性模型或其推广,以取代泊松脉冲序列假设,通常假设。它比视网膜记录中的泊松模型更准确地估计传输的信息量。由于其简单性,该模型有可能解释其他领域的低变异性。

英文摘要:

Neural noise sets a limit to information transmission in sensory systems. In several areas, the spiking response (to a repeated stimulus) has shown a higher degree of regularity than predicted by a Poisson process. However, a simple model to explain this low variability is still lacking. Here we introduce a new model, with a correction to Poisson statistics, which can accurately predict the regularity of neural spike trains in response to a repeated stimulus. The model has only two parameters, but can reproduce the observed variability in retinal recordings in various conditions. We show analytically why this approximation can work. In a model of the spike emitting process where a refractory period is assumed, we derive that our simple correction can well approximate the spike train statistics over a broad range of firing rates. Our model can be easily plugged to stimulus processing models, like Linear-nonlinear model or its generalizations, to replace the Poisson spike train hypothesis that is commonly assumed. It estimates the amount of information transmitted much more accurately than Poisson models in retinal recordings. Thanks to its simplicity this model has the potential to explain low variability in other areas.

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