Abstract: In this theoretical article, the authors turn to the analysis of studies explaining the origin and revealing the functions and meaning of human oral speech within the framework of an evolutionary approach. First of all, the authors are interested in the influence of sexual selection on the development of verbal skills in different age and gender groups. In this regard, the data of the history of the human life cycle are of particular interest, which indicate that the mastery of language as a tool for influencing and manipulating the opinions of others approaches an advanced level of proficiency only at the time of puberty, and speech, thus, begins to play an important role in intersex competition. Rapidly developing with the onset of puberty, the ability to performative vivid performances, to defend their position, as well as to conduct debates in public, apparently, can be guided by the forces of sexual selection, and therefore, they should manifest themselves more clearly in men than in women. It is assumed that verbal mastery can serve as a means of actively attracting attention for the purpose of self-promotion and improving the social status of the speaker. The methodological basis of our work was largely the analysis of ethnographic sources. In the article, the authors cite extensive ethnographic material confirming the connection of high social status with oratorical abilities. The authors also turn to the latest research that analyzes the differences in performative speech between men and women. Experimental work shows that in a conversation with an attractive woman, men tend to be more creative in choosing words and expressions. Some researches consider the connection of various aspects of speech with the attractiveness of the speaker, his masculinity and adaptability. Of great interest are studies studying the relationship between musical abilities and attractiveness, as well as works analyzing the articulatory features of oral speech and their connection with belonging to a certain social environment or social class. All the features of speech given in the review could most likely have been formed by the pressure of the forces of sexual selection. In this regard, the study of sexual dimorphism seems to be one of the most important directions in the research of performative speech.

Abstract: The key goals of this research consists in assessment and comparative analysis of the help of family in large postindustrial societies. For this purpose, the author carries out a cross-cultural comparative study of the frequency of family contacts in the three countries: Russia, the United States, and Brazil. Based on the 2019 online survey, the author collected quantitative data on the involvement of grandparents into upbringing process of their grandchildren in Russia (N=620), USA (N=308) and Brazil (N=603). In addition to the basic biosocial demographic parameters, the survey included two target questions on the frequency of communication between grandparents and grandchildren. Intensive migration processes and the resulting distance of households between the two generations in the indicated countries substantially reduces the traditional help of grandparents in upbringing the younger generation. The acquired data demonstrate the significant differences that take place in these three countries, and their correlation with the peculiarities of the family lifestyle in other countries. For example, the help of grandparents in Brazil is much lower than in Russia. Comprehensive analysis is also conducted on the factors that reduce the involvement of grandparents in upbringing of their grandchildren in Brazil. The decrease in the frequency of family contacts may be associated with the intensive urbanization processes unfolding in Brazil over the few recent decades. At the same time, the acquired data may reflect the in-depth processes of feminization of migration from less developed regions of the world to more economically prosperous countries. The analysis of the observed consequences of accelerated urbanization in Brazil is of applied importance for understanding the future prospects for the development of modern family.

Abstract: Understanding the nature of birth rate decline in the postindustrial world is a crucial task for a broad range of experts. It remains unclear what became the major motive for the switch of reproductive models in the highly urbanized world: the growing role of economic expenditure in a competitive urban environment or the result of manifestation of the new cultural norms of reproductive behavior via diffusion changing the modern demographic landscape. The theoretical part of the work familiarizes the audience with the main conclusions of the two competing hypotheses: the impact of economic versus of cultural factors upon the current birth rate. The practical part represents a quantitative study. As a result of application of the statistical methods of analysis in interviewing the Russian citizens, the author assesses the impact of economic and cultural factors upon birth rate, considering the factor of increasing urbanization. The article applies an interdisciplinary approach, as well as introduces into the scientific discourse the new materials of evolutionary ecology as one of the bases of human reproductive behavior. The analytical part focuses on the questions of population density (urbanization), its influence on birth rate in the observed cultures, taking into account the economic parameters.