Title :
Analyzing EEG scalp current density using the Hjorth estimator
Author :
Pon, Lin-Sen ; Sclabassi, Robert J. ; Sun, Mingui
Author_Institution :
Lab. for Comput. Neurosci., Pittsburgh Univ., PA, USA
Abstract :
Scalp current density (SCD) measurements can be used to identify sources and sinks of electrical current on the scalp. We derive a SCD estimator from the Laplacian equation and compare it to the Hjorth estimator. It is clarified that the Hjorth estimator is the weighted average of the directional differences while the Laplacian estimator represents the summation of the second derivatives
Keywords :
Laplace equations; current density; electroencephalography; EEG scalp current density; Hjorth estimator; Laplacian equation; directional differences; electrical current sinks; electrical current sources; second derivatives; weighted average; Current density; Current measurement; Density measurement; Electric variables measurement; Electrodes; Electroencephalography; Laplace equations; Neurosurgery; Scalp; Sun;
Conference_Titel :
[Engineering in Medicine and Biology, 1999. 21st Annual Conference and the 1999 Annual Fall Meetring of the Biomedical Engineering Society] BMES/EMBS Conference, 1999. Proceedings of the First Joint
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-5674-8
DOI :
10.1109/IEMBS.1999.804179
