[Age and features of different properties of the higher nervous activity type of dogs].

Age changes in typological properties of the nervous system were studied with alimentary and defensive reinforcements in 55 dogs: from one to two months old, three to four and twelve months old. Of these, 26 were annually examined up to the age of two to four years. The degree of similarity of each typological property, with both kinds of reinforcement, was determined in one and the same animal. The presence or absence of partiality was estimated for each typological property of the nervous system. In all the one to four months old puppies the excitatory process was estimated by both methods as strong or medium; without partiality. By the age of one to two years the partiality increases due to enhanced excitation in the defensive system. Partiality of the nervous processes equilibration is observed already in one to four months old puppies, though decreasing with age. Partiality of nervous processes mobility becomes more pronounced with age.