Friday, April 12, 2013

1304.3237 (K. -E. Lee et al.)

Noise-induced phase transitions in neuronal networks    [PDF]

K. -E. Lee, M. A. Lopes, A. V. Goltsev
Using an exactly solvable cortical model of a neuronal network, we show that, by increasing the intensity of shot noise (flow of random spikes bombarding neurons), the network undergoes first- and second-order non-equilibrium phase transitions. We study the nature of the transitions, bursts and avalanches of neuronal activity. Saddle-node and supercritical Hopf bifurcations are the mechanisms of emergence of sustained network oscillations. We show that the network stimulated by shot noise behaves similar to the Morris-Lecar model of a biological neuron stimulated by an applied current.
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