Max Planck Institute for Dynamics and Self-Organization -- Department for Nonlinear Dynamics and Network Dynamics Group
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BCCN AG-Seminar

Tuesday, 07.10.2008 17 c.t.

Analysis of a neuron culture growth model with self-organized criticality

by Dr. Borja Ibarz
from Nonlinear Dynamics and Chaos Group, Departamento de Física, Universidad Rey Juan Carlos, Madrid, Spain

Contact person: Raoul Martin Memmesheimer

Location

Seminarraum Haus 2, 4. Stock (Bunsenstr.)

Abstract

In vitro cultures of neocortical neurons, both dissociated and in slice, exhibit spontaneous activity consisting of short episodes of synchronous firing at many sites, called avalanches, separated by longer periods of silence. Some experiments have found that the distributions of avalanche sizes and durations have power-law form with exponents -3/2 and -2, respectively, as corresponds to critical branching processes. A simple growth model originally proposed by van Ooyen and van Pelt [1] may be useful to explain the emergence of criticality. In this talk we will introduce the model, explain the origin of criticality, and analyze the influence of model parameters on avalanche properties to test its robustness. References: [1] A. van Ooyen and J. van Pelt, "Complex periodic behavior in a neural network model with activity-dependent neurite outgrowth", J. theor. Biol. 179, 229-242 (1996)."

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