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