Article (Scientific journals)
Bayesian estimation of evoked and induced responses
Friston, Kark J.; Henson, Richard; Phillips, Christophe et al.
2006In Human Brain Mapping, 27 (9), p. 722-735
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Abstract :
[en] We describe an extension of our empirical Bayes approach to magnetoencephalography/electroencephalography (MEG/EEG) source reconstruction that covers both evoked and induced responses. The estimation scheme is based on classical covariance component estimation using restricted maximum likelihood (ReML). We have focused previously on the estimation of spatial covariance components under simple assumptions about the temporal correlations. Here we extend the scheme using temporal basis functions to place constraints on the temporal form of the responses. We show how the same scheme can estimate evoked responses that are phase-locked to the stimulus and induced responses that are not. For a single trial the model is exactly the same, In the context of multiple trials, however, the inherent distinction between evoked and induced responses calls for different treatments of the underlying hierarchical multitrial model. We derive the respective models and show how they can be estimated efficiently using ReML. This enables the Bayesian estimation of evoked and induced changes in power or, more generally, the energy of wavelet coefficients.
Disciplines :
Neurosciences & behavior
Radiology, nuclear medicine & imaging
Author, co-author :
Friston, Kark J.;  University College London - UCL > The Wellcome Dept. of Imaging Neuroscience
Henson, Richard;  University of Cambridge > MRC Cognition and Brain Sciences Unit
Phillips, Christophe  ;  Université de Liège - ULiège > Centre de recherches du cyclotron
Mattout, Jérémie;  University College London - UCL > The Wellcome Dept. of Imaging Neuroscience
Language :
English
Title :
Bayesian estimation of evoked and induced responses
Publication date :
September 2006
Journal title :
Human Brain Mapping
ISSN :
1065-9471
eISSN :
1097-0193
Publisher :
Wiley Liss, Inc., Hoboken, United States - New Jersey
Volume :
27
Issue :
9
Pages :
722-735
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 February 2011

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