[Possibility of 3-dimensional localization of EEG sources based on an equivalent dipole model]. 
Coordinates and moments of equivalent sources of certain kinds of EEG normal and pathological activity--alpha-rhythm, focal and generalized epiactivity--were estimated on a computer on the basis of a homogeneous model of a single equivalent dipole, by a modified method of the direct search.  Cartesian coordinates of electrodes located according to the standard scheme 10--20 were preliminarily estimated.  Precision of recovering source coordinates was determined on an agar two-layer spherical model with different localization of the stimulating electrode inside the sphere.  The estimated coordinates of normal activity sources are compared with the data of electrophysiological studies of the waves genesis, and those for pathological activity, with real coordinates of the pathological focus.