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Title: Noise focusing in neuronal tissues: Symmetry breaking and localization in excitable networks with quenched disorder
Author: Orlandi, Javier G.
Casademunt i Viader, Jaume
Keywords: Xarxes neuronals (Neurobiologia)
Neural networks (Neurobiology)
Issue Date: May-2017
Publisher: American Physical Society
Abstract: We introduce a coarse-grained stochastic model for the spontaneous activity of neuronal cultures to explain the phenomenon of noise focusing, which entails localization of the noise activity in excitable networks with metric correlations. The system is modeled as a continuum excitable medium with a state-dependent spatial coupling that accounts for the dynamics of synaptic connections. The most salient feature is the emergence at the mesoscale of a vector field V ( r ) , which acts as an advective carrier of the noise. This entails an explicit symmetry breaking of isotropy and homogeneity that stems from the amplification of the quenched fluctuations of the network by the activity avalanches, concomitant with the excitable dynamics. We discuss the microscopic interpretation of V ( r ) and propose an explicit construction of it. The coarse-grained model shows excellent agreement with simulations at the network level. The generic nature of the observed phenomena is discussed.
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It is part of: Physical Review e, 2017, vol. 95, num. 5, p. 052304-1-052304-8
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ISSN: 2470-0045
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)
Articles publicats en revistes (Institut de Recerca en Sistemes Complexos (UBICS))

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