METHODS BASED ON FINITE-ELEMENTS FOR THE COMPUTATION OF ELECTRIC AND MAGNETIC-FIELDS IN ELECTROENCEPHALOGRAPHY AND MAGNETOENCEPHALOGRAPHY

So as to compute the electric potential and the flux density generated by the electrical activity of the brain, numerical methods based on t he Finite Element Method have been developed. These methods, which can treat realistic head models and can take into account anisotropy of c onductivity, for instance in the skull, are presented. Then two numeri cal examples are described: a spherical model and a realistic bead mod el.