Effect of Skull Resistivity on the Relative Sensitivity Distributions of EEG and MEG Measurements
Abstract
The authors have previously published calculations that show that, despite the high resistivity of the skull, the spatial sensitivity of magnetoencephalography, MEG, is no better than that of electroencephalography, EEG. The results were based on the widely used Rush-Driscoll head model, according to which skull resistivity is considered to be 80 times that of the brain and scalp. Recent research indicates that skull resistivity is only about 15 times that of the brain and scalp. Calculations of EEG sensitivity distributions with this value show that EEG has considerably better spatial resolution than MEG. Since clinical recordings are not in conflict with such a result, the conclusion can be considered reliable. The finding supports the use of high-resolution EEG as a research and clinical tool in recording the electrical activity of the brain.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 25, 2001
- Accession Number
- ADA410772
Entities
People
- J. A. Malmivuo
- V. Suihko
Organizations
- Tampere University of Technology