[Possible mechanism of the thalamic pacemaker of alpha-rhythm and fusiform activity]

Proceedings from the analysis of known experimental data on theta-rhythm (fusiform activity) a determinate model of its generator is proposed. It is based on the mechanism of beats frequencies. The model consists of 2 united identical moduli generating harmonic (rhythmical) oscillations alpha-rhythms of approximating frequencies v1 and v2 = v1 + delta v. The working regime of the generator is determined by the trigger pulse frequency. The proposed quantitative relationships between theta-rhythm parameters--T, n and frequencies of constituent oscillations v and delta v are checked up by analysing oscillograms of barbiturate activity in EEG of dogs. The results obtained are in favour of determinate rather than stochastic mechanism of theta-rhythm.