GIL , Lionel

International audience

International audience

We show that a network of non-identical nodes, with excitable dynamics, pulse-coupled, with coupling delays depending on the Euclidean distance between nodes, is able to adapt the topology of its connections to obtain spike frequency synchronization. The adapted network exhibits remarkable properties: sparse, anti-cluster, necessary presence of...

We show that a network of nonidentical nodes, with excitable dynamics, pulse-coupled, with coupling delays depending on the Euclidean distance between nodes, is able to adapt the topology of its connections to obtain spike frequency synchronization. The adapted network exhibits remarkable properties: sparse, anticluster, necessary presence of a...

We predict the wave vectors (norme and orientation) which have to be observed near the threshold of a generic bifurcation of a 2D stationary hexagonal pattern.

We design and analyze a new paradigm for building supervised learning networks, driven only by local optimization rules without relying on a global error function. Traditional neural networks with a fixed topology are made up of identical nodes and derive their expressiveness from an appropriate adjustment of connection weights. In contrast,...

International audience

Retinal waves are spontaneous waves of spiking activity observed in the retina, during development only,playing a central role in shaping the visual system and retinal circuitry. Understanding how these waves areinitiated and propagate in the retina could enable one to control, guide and predict them in the in vivo adultretina as inducing them...

International audience

International audience

We identify the origin of some numerical difficulties related to causality which appear in the simulation of transport equations. Two numerical techniques are presented for the integration of models describing counter-propagating laser beams in interaction with a nonlinear medium. One, based on the characteristic method, rests on the transport...

Based on a biophysical model of retinal Starburst Amacrine Cell (SAC) \cite{karvouniari-gil-etal:19} we analyse here the dynamics of retinal waves, arising during the visual system development. Waves are induced by spontaneous bursting of SACs and their coupling via acetycholine. We show that, despite the acetylcholine coupling intensity has...

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International audience

Retinal waves are spontaneous bursts of activity propagating in the developping retina and thought to play a central role in shaping the visual system and retinal circuitry. They first occur at early embryonic stages of development and gradually disappear upon maturation. Understanding their generating mechanisms may help to control and use...

Retinal waves are spontaneous bursting activity propagating in the developping retina until vision is functional. In this work we propose a biophysical modelling of the mechanism that generates the spontaneous intrinsic cell-autonomous rhythmic bursting in Starbust Amacrine Cells (SACs), observed experimentally in [1] which is directly linked...

International audience

International audience

International audience

International audience

Retinal waves are bursts of activity occurring spontaneously in the developing retina of vertebrate species, contributing to the shaping of the visual system organization. They are characterized by localized groups of neurons becoming simultaneously active, initiated at random points. Based on our previous modelling work [1], we now propose a...