LORETA ("Low Resolution Electromagnetic Tomography") is a distributed inverse method of the family of weighted minimum norm
methods. LORETA was suggested by R.D. Pascual-Marqui (International Journal of Psychophysiology. 1994, 18:49-65). LORETA is
characterized by a smoothness constraint, represented by a discrete 3D Laplacian. The LORETA image in BESA Research displays
the norm of the 3 components of S at each location r.