Population dynamics: Variance and the sigmoid activation function

Population dynamics: Variance and the sigmoid activation function
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DOI:
10.1016/j.neuroimage.2008.04.239
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发表时间:
2008-08-01
期刊:
影响因子:
5.7
通讯作者:
Friston, Karl J.
Friston, Karl J.
中科院分区:
医学1区
文献类型:
--
作者:
Marreiros, Andre C.;Daunizeau, Jean;Friston, Karl J.

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本文演示了如何根据神经元状态的变化或离散来理解神经元质量模型的S型激活函数。我们使用这种关系来估计隐藏神经元状态的概率密度,使用非侵入性电生理(EEG)测量和动态随意建模。使用合成数据和感觉诱发反应的实际脑电测量,说明了神经元状态的隐式变化对于皮质动力学的神经质量模型的重要性。(C)2008 Elsevier Inc.保留所有权利。
This paper demonstrates how the sigmoid activation function of neural-mass models can be understood in terms of the variance or dispersion of neuronal states. We use this relationship to estimate the probability density on hidden neuronal states, using non-invasive electrophysiological (EEG) measures and dynamic casual modelling. The importance of implicit variance in neuronal states for neural-mass models of cortical dynamics is illustrated using both synthetic data and real EEG measurements of sensory evoked responses. (C) 2008 Elsevier Inc. All rights reserved.