Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2007-11-08
Physics
Condensed Matter
Disordered Systems and Neural Networks
8 pages, 8 figures
Scientific paper
10.1103/PhysRevE.78.061906
We investigated the influence of efficacy of synaptic interaction on firing synchronization in excitatory neuronal networks. We found spike death phenomena, namely, the state of neurons transits from limit cycle to fixed point or transient state. The phenomena occur under the perturbation of excitatory synaptic interaction that has a high efficacy. We showed that the decrease of synaptic current results in spike death through depressing the feedback of sodium ionic current. In the networks with spike death property the degree of synchronization is lower and unsensitive to the heterogeneity of neurons. The mechanism of the influence is that the transition of neuron state disrupts the adjustment of the rhythm of neuron oscillation and prevents further increase of firing synchronization.
Huang Zi-Gang
Wang Sheng-Jun
Wang Ying-Hai
Wu Zhi-Xi
Xu Xin-Jian
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