PMID: 11310782Apr 20, 2001Paper

Spatial filter approach for evaluation of the surface Laplacian of the electroencephalogram and magnetoencephalogram

Annals of Biomedical Engineering
L Alan Bradshaw, J P Wikswo

Abstract

The surface Laplacian is a technique that has been utilized to improve the spatial resolution of the electroencephalogram (EEG) and the magnetoencephalogram (MEG). We investigate the amount of improvement to the spatial resolution afforded by the surface Laplacian by examining the spatial filters that describe the relationship between cortical current sources and the surface Laplacian. The surface Laplacian spatial filters extend into higher spatial frequencies than do raw signal spatial filters, particularly for EEG Laplacian spatial filters, indicating that substantial improvement in spatial resolution is possible. However, the response of the surface Laplacian operation to the nature and amount of noise in the raw EEG and MEG signals is of paramount importance. Spatially correlated noise, coupled with uncorrelated noise, requires additional regularization of inverse spatial filters resulting in a decrease in spatial resolution. Substantial improvements in spatial resolution may be obtained using the surface Laplacian techniques as long as correlated noise levels are small and raw signals have relatively high signal-to-noise ratios.

Citations

Sep 3, 2014·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Fabrizio De Vico FallaniSophie Achard
Mar 23, 2013·Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia·Chou-Ching K LinJing-Jane Tsai
Apr 30, 2015·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Jürgen Kayser, Craig E Tenke
Jan 7, 2015·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Jürgen Kayser, Craig E Tenke
May 13, 2008·Journal of Neuroscience Methods·Alain de Cheveigné, Jonathan Z Simon
Oct 30, 2007·Journal of Neuroscience Methods·Alain de Cheveigné, Jonathan Z Simon
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Aug 17, 2020·Cerebral Cortex·Laura BonanniUNKNOWN FTD Italian study group-SINDEM
Dec 4, 2020·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Amina CoffeyBahman Nasseroleslami
Jun 4, 2021·BMC Bioinformatics·Shiu KumarAlok Sharma

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