[Relationship between the sequelae of zoosocial isolation and individual characteristics of the animal].

The changes were studied of various psychophysiological characteristics of mice behaviour, arising after prolonged solitary isolation in cages. The qualitative specificity of such changes is non-uniform and depends on the animals' individual characteristics (spontaneously aggressive or nonaggressive after isolation). Two types of the consequences of isolation are singled out: 1) General changes (non-specific) arising in all groups of mice; 2) Special changes (specific), typical of a certain group of animals only. In the group of aggressive mice there is a difference between aggression enhanced by isolation, and that which developed in the course of isolation. The most substantial qualitative changes in behaviour takes place in the latter case. It has been suggested that only individual approach makes it possible to determine exactly the qualitative aspects of social isolation consequences.