NEUROCHEMICAL CHARACTERISTICS OF RATS WIT H DIFFERENCES IN INDIVIDUALBEHAVIOR IN EMOTIONAL RESONANCE TEST - FREE-RADICAL PROCESSES AND LIPIDS IN CEREBRAL-CORTEX OF OLD RATS

Free radical processes and lipid content in brain membranes were inves tigated in old male Wistar rats with differences in individual behavio ur in <<emotional resonance>> test. Two groups of rats were selected, i.e., 1 - which stayed for more than 2/3 of the total test time in the dark part of the experimental chamber and 2 - which spent the total t est time in the light part of the chamber. Free radical processes and lipid content in the cortex of the left and right brain hemispheres di d not differ in control animals of groups 1 and 2. Acute immobilizatio n stress induced changes of the studied parameters depending on behavi oural type. Rats of group 2 were more reactive than those of group 1.