[EEG potential theory in a model with thin brain integuments. III. Source--tangential double layer in the cortex].

Estimates of EEG-potentials obtained in the model of polylayer spherical and flat cables indicate that the geometry of the skull has only little influence. Potentials of EEG of the radial dipole and the tangential double layer are expressed by simple formules in these models. A theoretical explanation concerning great dispersion of ECoG to EEG ratio and identity of EEG-potentials, registered by two electrodes spaced within about 2 cm of one another, is presented.