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- Title
Sensitivity of MEG and EEG to source orientation.
- Authors
Ahlfors, Seppo P; Han, Jooman; Belliveau, John W; Hämäläinen, Matti S
- Abstract
An important difference between magnetoencephalography (MEG) and electroencephalography (EEG) is that MEG is insensitive to radially oriented sources. We quantified computationally the dependency of MEG and EEG on the source orientation using a forward model with realistic tissue boundaries. Similar to the simpler case of a spherical head model, in which MEG cannot see radial sources at all, for most cortical locations there was a source orientation to which MEG was insensitive. The median value for the ratio of the signal magnitude for the source orientation of the lowest and the highest sensitivity was 0.06 for MEG and 0.63 for EEG. The difference in the sensitivity to the source orientation is expected to contribute to systematic differences in the signal-to-noise ratio between MEG and EEG.
- Publication
Brain topography, 2010, Vol 23, Issue 3, p227
- ISSN
1573-6792
- Publication type
Journal Article
- DOI
10.1007/s10548-010-0154-x