As a result of the effect of the gas condensate containing hydrogen sulfide a depression takes place of orienting-investigatory activity of Wistar male rats in conditions of open field, disturbance of elaboration and reproduction of conditioned reflex of two-way avoidance, surplus accumulation in the cerebral cortex tissue of products of peroxide lipids oxidation and depression of catalase. The changes were of cyclic character and returned to the level of the control animals in 48 h after the finishing of the effect.

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