Continuous current source inversion of evoked potential fields in a spherical model head.
This study explores the efficacy of a physiological constraint on cortical current generators in promoting a robust solution for the inverse problem in evoked potentials. It is proposed that the current sources responsible for the evoked potential be modeled as a set of dipoles oriented orthogonal to the surface of the cortex. Rather than using a minimum norm approach, the solution space is searched for a vector that minimizes the error of the predicted evoked potential scalp field.
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Department of Ophthalmology, University of Texas Southwestern Medical Center at Dallas 75235.
D000818:Animals; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000502:physiology*; D004566:Electrodes; D005071:Evoked Potentials / Q000502:physiology*; D006801:Humans; D008959:Models, Neurological; D011237:Predictive Value of Tests; D012815:Signal Processing, Computer-Assisted