Here, we present the technique to determine the social rank in rats based on the quanti- tative analysis of sociometric matrices built using the data on the antagonistic relation- ships between the animals during competition for reward. We compare and evaluate the existing techniques and propose a new experimental model of the dominant behavior as- sessment in small groups of rats in laboratory conditions that considers the individual drinking activity of each rat, as well as the dyadic competitive relationships. The data analysis is based on the histograms of the drinking duration for rats, the ratio of the vic- tories and losses in dyads during the competition for access to drinking bowl, and the evaluation of the motivation to satisfy the thirst during the periods of experimental ses- sions. The approbation of the developed technique has demonstrated that the imple- mentation of these approaches allows for accurate determination of the social rank of each rat, as well as for monitoring of the dynamics of the formation, stability, and plas- ticity of social organization in the groups throughout the whole period of their existence. Therefore, this complex technique may help to determine the relationships between the hierarchical structure of the groups of social animals, their individual social rank, and various physiological, pharmacological, environmental, and other factors.
Post-conflict interactions between victims and non-involved group members was investigated in the troop of hamadryas baboons, Papio hamadryas. Observations were done in the Russian Primate Center, Adler in 1996—1997. Redirected aggression, initiation of affiliation from the side of victims towards third parties and consolation were registered during this study. The analyses was done on 445 PC-MC pairs of animals, represented different social classes (harem male-female pairs, harem females, relations, females from different harems, male-male pairs, female-subadult pairs). The attracted-pairs method and the time-rule method were used. Redirected aggression was practiced mainly by male aggressees. It was typical for victims, both males and females, to initiate affiliative interactions with third parties soon after the conflict. Consolation was practiced by hamadryas baboons, but it was limited to harem male-female pairs only. Special affiliative patterns were used by male-consoler. This is the first case, when consolation was demonstrated in baboons
The changes of 272 EEG parameters in 252 women and 97 men during the period of life of 16 to 45 years in increments of one month were investigated. Correlation analysis and approximations were used. Ontogenetic regression of amplitude and power amplitude and power of alpha, theta, delta, but not beta rhythms predominantly in the right posterior cortex leads in women was more regressive than in men was shown. Overall ontogenetic tendency to fall to the nonlinear amplitude and power of EEG rhythms with age is reproduced in both sexes. Frequency of rhythms in the course of ontogeny, as a rule, was the compensatory increase. So, in neurologically healthy men and women differently achieved the same goal - adaptive response of the brain to age conversion.