Existence and wandering of bumps in a spiking neural network model

Chow, Carson and Coombes, Stephen (2006) Existence and wandering of bumps in a spiking neural network model.

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Abstract

We study spatially localized states of a spiking neuronal network populated by a pulse coupled phase oscillator known as the lighthouse model. We show that in the limit of slow synaptic interactions in the continuum limit the dynamics reduce to those of the standard Amari model. For non-slow synaptic connections we are able to go beyond the standard firing rate analysis of localized solutions allowing us to explicitly construct a family of co-existing one-bump solutions, and then track bump width and firing pattern as a function of system parameters. We also present an analysis of the model on a discrete lattice. We show that multiple width bump states can co-exist and uncover a mechanism for bump wandering linked to the speed of synaptic processing. Moreover, beyond a wandering transition point we show that the bump undergoes an effective random walk with a diffusion coefficient that scales exponentially with the rate of synaptic processing and linearly with the lattice spacing.

Item Type:Article
Uncontrolled Keywords:spiking neural network, bump solutions, working memory, lighthouse model
Schools/Departments:Faculty of Science > School of Mathematical Sciences
ID Code:407
Deposited By:Coombes, Prof Stephen
Deposited On:24 May 2006
Last Modified:27 Jun 2011 11:14

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