title: Multielectrode electroencephalogram power spectra: theory and application to approximate correction of volume conduction effects.
abstract: Using a physiologically based model of brain activity, electroencephalogram (EEG) power spectra are calculated for signals derived from general linear combinations of voltages from multiple electrodes, with and without filtering by volume conduction. Two simple methods of combining scalp measurements to estimate unfiltered EEG power spectra are then proposed and their accuracy and robustness are explored, using the model predictions as an illustration. It is found that these methods, including a case that uses just three electrodes, enable improved estimation of the underlying spectrum relative to each of several widely used combinations alone.
authors.affiliation: School of Physics, University of Sydney, New South Wales 2006, Australia.
authors.forename: J A
authors.initials: JA
authors.lastname: Henderson
authors.forename: A J K
authors.initials: AJ
authors.lastname: Phillips
authors.forename: P A
authors.initials: PA
authors.lastname: Robinson
mesh_terms: D000200:Action Potentials / Q000502:physiology*; D000465:Algorithms; D000818:Animals; D016477:Artifacts; D001931:Brain Mapping / Q000295:instrumentation / Q000379:methods*; D003198:Computer Simulation; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D004566:Electrodes; D004569:Electroencephalography / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D008959:Models, Neurological; D009431:Neural Conduction / Q000502:physiology*