[A model of the structure of the dipole source of the alpha rhythm in the human visual cortex]

The model of the alpha-rhythm was studied which consisted of a set of elementary dipoles. The dipoles were fixed normally to the surfaces of a cruciform structure which imitated the structure of the visual cortex. The magnitude of dipole moments varied according to the sinusoidal low. Thus, the effect was produced of the waves leaving the epicenters which in one case were located in the lower parts of the cruciform structure and at the ends of the side rays of this structure in the other case. The model enabled imitation of all experimentally found phenomena of the alpha-wave travelling (fronto-occipital travelling, rotatory travelling, diagonal and transverse forms). Additionally, the phenomenon was found which enabled simulation of the flat EEG with remaining cortical alpha activity. The possible velocity of the alpha-wave propagation in the visual cortex was calculated. The model can be applied for testing the hypothesis that the alpha-rhythm is a scanning mechanism in the visual cortex.