Space-time event sparse penalization for magneto-/electroencephalography.
Space-time event sparse penalization for magneto-/electroencephalography.
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DOI:
10.1016/j.neuroimage.2009.01.056
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发表时间:
2009-07-15
期刊:
影响因子:
5.7
通讯作者:
Nowak R
中科院分区:
文献类型:
--
作者:
Bolstad A;Van Veen B;Nowak R
This article presents a new spatio-temporal method for M/EEG source reconstruction based on the assumption that only a small number of events, localized in space and/or time, are responsible for the measured signal. Each space-time event is represented using a basis function expansion which reflects the most relevant (or measurable) features of the signal. This model of neural activity leads naturally to a Bayesian likelihood function which balances the model fit to the data with the complexity of the model, where the complexity is related to the number of included events. A novel Expectation-Maximization algorithm which maximizes the likelihood function is presented. The new method is shown to be effective on several MEG simulations of neurological activity as well as data from a self-paced finger tapping experiment.
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