Avalanche dynamics of an idealized neuron function in the brain on uncorrelated random scale-free network

We study a simple model for a neuron function in a collective brain system. The neural network is composed of uncorrelated random scale-free network for eliminating the degree correlation of dynamical processes. The interaction of neurons is supposed to be isotropic and idealized. This neuron dynamics is similar to biological evolution in extremal dynamics with isotropic locally interaction but has different time scale. The evolution of neuron spike takes place according to punctuated patterns similar to the avalanche dynamics. We find that the evolutionary dynamics of this neuron function exhibit self-organized criticality which shows power-law behavior of the avalanche sizes. For a given network, the avalanche dynamic behavior is not changed with different degree exponents of networks, γ ≥ 2.4 and refractory time correspondent to the memory effect, Tr. In addition, the avalanche size distributions exhibit the power-law behavior in a single scaling region in contrast to other networks. However, the return time distributions displaying spatiotemporal complexity have three characteristic time scaling region.