[The sequelae of the intraspecific isolation of adult rats (right-handed, left-handed and ambidextrous animals)].

We studied the influence of social isolation at the age of 2 months on zoosocial behaviour of mixed-bred male rats with different paw preference. Paw preference was determined in the test of reaching for food in the horizontal tube. The level of aggression but not sociability was found to increase significantly in dextral and ambidextrous late isolants. In sinistrals the increase of sociability but not aggression was observed. Analysis of probabilistic ethological structure of aggressive behaviour showed its validity and revealed the appearance of pathological aggression as a result of isolation in all groups of animals. Being connected with a disfunction of the regulating role of the right brain hemisphere this feature of aggressive behaviour is most pronounced in dextrals and ambidextrals.