11835609

Source:http://linkedlifedata.com/resource/pubmed/id/11835609

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Predicate	Object
rdf:type	pubmed:Citation
lifeskim:mentions	umls-concept:C0024489, umls-concept:C0185125, umls-concept:C0441655, umls-concept:C0449416, umls-concept:C0599851
pubmed:issue	4
pubmed:dateCreated	2002-2-8
pubmed:abstractText	We have applied the eigenspace-based beamformer to reconstruct spatio-temporal activities of neural sources from MEG data. The weight vector of the eigenspace-based beamformer is obtained by projecting the weight vector of the minimum-variance beamformer onto the signal subspace of a measurement covariance matrix. This projection removes the residual noise-subspace component that considerably degrades the signal-to-noise ratio (SNR) of the beamformer output when errors in estimating the sensor lead field exist. Therefore, the eigenspace-based beamformer produces a SNR considerably higher than that of the minimum-variance beamformer in practical situations. The effectiveness of the eigenspace-based beamformer was validated in our numerical experiments and experiments using auditory responses. We further extended the eigenspace-based beamformer so that it incorporates the information regarding the noise covariance matrix. Such a prewhitened eigenspace beamformer was experimentally demonstrated to be useful when large background activity exists.
pubmed:language	eng
pubmed:journal	http://linkedlifedata.com/resource/pubmed/journal/9419065
pubmed:citationSubset	IM
pubmed:status	MEDLINE
pubmed:month	Apr
pubmed:issn	1065-9471
pubmed:author	pubmed-author:MarantzAlecA, pubmed-author:MiyashitaYasushiY, pubmed-author:NagarajanSrikantan SSS, pubmed-author:PoeppelDavidD, pubmed-author:SekiharaKensukeK
pubmed:copyrightInfo	Copyright 2002 Wiley-Liss, Inc.
pubmed:issnType	Print
pubmed:volume	15
pubmed:owner	NLM
pubmed:authorsComplete	Y
pubmed:pagination	199-215
pubmed:dateRevised	2006-11-15
pubmed:meshHeading	pubmed-meshheading:11835609-Evoked Potentials, Auditory, pubmed-meshheading:11835609-Humans, pubmed-meshheading:11835609-Magnetoencephalography, pubmed-meshheading:11835609-Male, pubmed-meshheading:11835609-Models, Neurological, pubmed-meshheading:11835609-Temporal Lobe
pubmed:year	2002
pubmed:articleTitle	Application of an MEG eigenspace beamformer to reconstructing spatio-temporal activities of neural sources.
pubmed:affiliation	Department of Electronic Systems and Engineering, Tokyo Metropolitan Institute of Technology, Asahigaoka 6-6, Hino, Tokyo 191-0065, Japan. ksekiha@cc.tmit.ac.jp
pubmed:publicationType	Journal Article, Research Support, Non-U.S. Gov't