arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1003.1196cond-mat.dis-nnq-bio.NC
收藏

具有突触抑制的随机神经网络模型的平均场分析

Mean Field Analysis of Stochastic Neural Network Models with Synaptic Depression

Yasuhiko Igarashi, Masafumi Oizumi, Masato Okada

摘要:

我们研究了突触抑制对随机神经网络宏观行为的影响。通过取两个随机变量的平均值,推导出了这种网络的动力学平均场方程:一个放电状态变量和一个突触变量。在这些方程中,由于两个随机变量是独立的,它们的平均乘积解耦为它们的平均乘积。我们证明了这两个随机变量的独立性,假设突触的重量是1/N的顺序相对于神经元的数量N。利用这些方程,我们导出了具有均匀连接的网络和具有墨西哥帽型连接的环形吸引子网络的宏观稳态方程,并研究了稳态解的稳定性.在具有均匀连接的网络中观察到一个振荡的均匀状态,这是由于一个Hopf不稳定性。对于环形网络,高频扰动不影响系统稳定性。两种机制使非均匀稳态不稳定,导致两个振荡状态。一个图灵不稳定性导致一个旋转的凸块状态,而一个霍普夫不稳定性导致一个振荡的凸块状态,这是以前没有报道。不同的振荡状态发生在一个网络与突触抑制取决于强度的神经元间的连接。

英文摘要:

We investigated the effects of synaptic depression on the macroscopic behavior of stochastic neural networks. Dynamical mean field equations were derived for such networks by taking the average of two stochastic variables: a firing state varialbe and a synaptic variable. In these equations, their average product is decoupled as the product of averaged them because the two stochastic variables are independent. We proved the independence of these two stochastic variables assuming that the synaptic weight is of the order of 1/N with respect to the number of neurons N. Using these equations, we derived macroscopic steady state equations for a network with uniform connections and a ring attractor network with Mexican hat type connectivity and investigated the stability of the steady state solutions. An oscillatory uniform state was observed in the network with uniform connections due to a Hopf instability. With the ring network, high-frequency perturbations were shown not to affect system stability. Two mechanisms destabilize the inhomogeneous steady state, leading two oscillatory states. A Turing instability leads to a rotating bump state, while a Hopf instability leads to an oscillatory bump state, which was previous unreported. Various oscillatory states take place in a network with synaptic depression depending on the strength of the interneuron connections.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑