[Changes in the oxygen tension and bioelectrical activity of the brains of animals subjected to acute hypoxia].

Simultaneous recording of oxygen tension (pO2) and bioelectrical activity led from different cerebral structures was made in rabbits and rats with implanted electrodes under conditions of acute hypoxia. Marked activation of the EEG as electrophysiological correlate of behavioural response was observed in rabbits only at the beginning of "ascent" and "descent". The EEG, respiration, and cardiac activity changes associated with the drop of PO2 in the brain tissue (activation of these parameters at the low "altitude" /2000-6000 m/ and their suppression at the maximal "altitudes" /8500 m/) were of approximately of the same character in both species.