数学連携サロン第25回 Neuron Avalanches and Background Activity

本セミナーは第146回複雑系セミナーと共催されます

Jian Zhai, Professor, Department of Mathematics, Zhejiang University

Spontaneous neuronal activity is an important property of the cerebral cortex but its spatiotemporal organization and dynamical framework remain poorly understood. Studies in tissue cultures, anesthetized rats and awake monkeys show that spontaneous activity forms neuronal avalanches[Beggs2004…Plenz2009]. These researchers suggest that networks with neuronal avalanches are poised at a critical state that optimizes input processing, information storage and transfer. The spontaneous activity in the cerebral cortex called “ongoing” and “resting state” activity in their papers is clearly related to the ECoG background activity. By their definition, negative local field potentials (nLFPs) deflections forms neuronal avalanches that are scale invariant in space and time. It is also threshold invariant since smaller nLFPs are embedded in clusters of larger ones without destroying the spatial and temporal scale invariance. So the ongoing cortical synchronization is space, time and local neuronal group size scale invariant. This fractal organization has onto genetic and phylogenetic implications that allows large increases in network capacity without a fundamental reorganization of the system. In this talk, a refractory Poisson (rPoisson) model is proposed to simulate ECoG and to elicit spike trains from rabbit ECoG. Furthermore, the avalanche phenomenon for ECoG background activity is studied: the spike trains elicited from rPossion process have power law for frequency and (or) nLFP. This is a joint work with W.Freeman (UCB).

第25回ポスター(PDF; 212KB)

セミナー区分
セミナー
開催日時
2010年   7月 22日 13時 ~ 2010年   7月 22日 14時 30分
場所
中央キャンパス総合研究棟(北12西6 旧電子研12条棟) 5F講義室 
講演者・世話人
Jian Zhai, Professor, Department of Mathematics, Zhejiang University
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