Effect of interpopulation spike-timing-dependent plasticity on neuronal synchronized rhythms in clustered small-world networks with inhibitory and excitatory populations

摘要

Effect of interpopulation spike-timing-dependent plasticity on neuronal synchronized rhythms in clustered small-world networks with inhibitory and excitatory populations We consider clustered small-world networks with two inhibitory (I) and excitatory (E) populations. This I-E neuronal net- work has adaptive dynamic! to Eand E tol interpopulation synaptic strengths, governed by interpopulation spike-timing-dependent plasticity (STDP). In previous works without STDPs, fast sparsely synchronized rhythms, related to diverse cognitive functions, were found to appear in a range of noise intensity D for static synaptic strengths. Here, by varying D, we investigate the effect of inter- population STDPs on synchronized rhythms that emerge in the I- and the E-populations. Depending on values of D, long-term poten- tiation and long-term depression for population-averaged values of saturated interpopulation synaptic strengths are found to occur, and they make effects on the degree of population synchronization. Ina broad region of intermediate D, the degree of good synchroniza- tion (with higher spiking measure) becomes decreased, while in a region of large D, the degree of bad synchronization (with lower spiking measure) gets increased. Consequently, in each I- or E- population, the synchronization degree becomes nearly the same in a wide range of D. We note that this kind of equalization effect in interpopulation synaptic plasticity is in contrast to the Matthew (bipolarization) effect in intrapopulation (I to I and E to E) synaptic plasticity where good (bad) synchronization gets better (worse).