Abstract:
:Evoked potentials are difficult to analyze because multiple sources are active simultaneously. Principal component analysis and dipole localization are two techniques that have been used to disentangle overlapping sources. Both of these techniques have problems. Principal component analysis suffers from a rotation ambiguity. Dipole localization suffers from biases when the model used to derive the sources from the scalp potentials is misspecified. Using computer simulations we demonstrate that by applying both of these techniques to the Laplacian of the voltages rather than to the raw voltages the problems associated with the two techniques are reduced. Computer programs for the analyses are presented in an Appendix.
journal_name
Brain Topogrjournal_title
Brain topographyauthors
Klein SA,Carney Tdoi
10.1007/BF01199773subject
Has Abstractpub_date
1995-01-01 00:00:00pages
91-108issue
2eissn
0896-0267issn
1573-6792journal_volume
8pub_type
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