With rigorous identifications of the firing patterns and firing pattern transition aided by dynamic system theory, neuronal coding machinery now can be studied as an object of 'exact' science. A systematic investigation of the 'global' bifurcation structures controlled by the biologically significant parameters could provide a basic guiding framework of knowledge to the understanding of neuronal coding. The coding process of a neuron is actually the firing response of the neuron to the dynamic modulations on its parameters, in the thermal fluctuating and synaptic noisy environment, on the basis of such bifurcation structures. The dynamic temporal relations between the input modulations and the output changing rhythms are to be eventually illuminated by the underlying dynamic and stochastic bifurcation structures and a dynamic rhythm coding theme of neuronal firing coding is under emerging.
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