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Noisy threshold in neuronal models: connections with the noisy leaky integrate-and-fire model

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Abstract

Providing an analytical treatment to the stochastic feature of neurons’ dynamics is one of the current biggest challenges in mathematical biology. The noisy leaky integrate-and-fire model and its associated Fokker–Planck equation are probably the most popular way to deal with neural variability. Another well-known formalism is the escape-rate model: a model giving the probability that a neuron fires at a certain time knowing the time elapsed since its last action potential. This model leads to a so-called age-structured system, a partial differential equation with non-local boundary condition famous in the field of population dynamics, where the age of a neuron is the amount of time passed by since its previous spike. In this theoretical paper, we investigate the mathematical connection between the two formalisms. We shall derive an integral transform of the solution to the age-structured model into the solution of the Fokker–Planck equation. This integral transform highlights the link between the two stochastic processes. As far as we know, an explicit mathematical correspondence between the two solutions has not been introduced until now.

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Acknowledgments

We would like to thank both anonymous reviewers whose valuable comments helped us improve our paper. In particular, some important observations over the nature of a possible inverse transform have been made that were included in the last section of the paper.

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Correspondence to G. Dumont.

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Dumont, G., Henry, J. & Tarniceriu, C.O. Noisy threshold in neuronal models: connections with the noisy leaky integrate-and-fire model. J. Math. Biol. 73, 1413–1436 (2016). https://doi.org/10.1007/s00285-016-1002-8

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  • DOI: https://doi.org/10.1007/s00285-016-1002-8

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