Present article describes the most important methods serving to know how the central nervous system and it’s structures works and also ways to establish the diagnosis of eventually pathological changes in it. Aditionally this is a review of medical researches into the causes of cerebral cortex beginning from brain teasing by electricity (Fritsch method) ending on the most modern nowadays examinations as Pozitron Emission Tomography, because thanks to it there is a possibility to obtain the three – dimensional picture of the part of the patient’s body. The authors are actually working on the practical application of the EEG method with animals, so they took the liberty of expose their experiments.

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