The last ten years a severe increase in the technologies background is observed, caused by various factors including a raised level of electromagnetic radiation in the environment [1]. At the same time low intensity microwaves are more and more used for medical-biological purposes to diagnose and treat quite a number of organic pathologies. A brain is especially sensitive to the influence of microwaves. Most effective method for estimation of the organism functional states is an analysis of electroencephalograms. Rhythms of the latter reflect the organism neurone activity [2-4].

This paper presents investigation results of the bioelectric activity of animal brain influenced by low-intensity millimetre waves or by the introduction of strychnine, or by their combination with the aim to analysis electrocorticograms by nonlinear dynamics methods and make clear the possibility of the organism states correction by microwaves.