This article explores the relationship between language structure and social environment, positing that linguistic factors such as morphological complexity are associated with demographic/socio-historical factors such as number of speakers, geographic spread, and degree of language contact. Data support such an association. The authors further propose a Linguistic Niche Hypothesis suggesting that “the level of morphological specialization is a product of languages adapting to the learning constraints and the unique communicative needs of the speaker population” (7).

This study investigates a material explanation for the practice of twin infanticide. Empirical analysis suggests that twin infanticide is more likely where women lack sufficient facilities to rear two infants while fulfilling her other responsibilities.

Drawing from previous theories on the cultural variation of depression, this article tested the relationship between 24 sociocultural and ecological factors and the prevalence of depression across 195 countries and territories. The authors first conducted a zero-order association test to find the most contributory factors. Those variables were further tested in a regression model, and controlled for the under-reporting of depression by measuring the number of healthcare workers per capita. The authors found that cultural individualism was the only factor that positively predicted depression prevalence in a multiple regression model.

The authors compare language phylogenies and spatial distributions with folktale frequencies of Indo-European peoples in order to reconstruct their cultural transmission. A stronger association is found between folktale frequency and language phylogeny than has been proposed in earlier literature studies, indicating that vertical transmission is more influential on folktale distribution than horizontal transmission through spatial proximity. Finally, the frequencies of certain folktales appear to trace the ancestral divergences of Indo-European languages to a much deeper level than previously though, suggesting that folktales are representative of broader features of culture, rather than recent literary inventions.

This study investigates the role of economic development in facilitating political development in preindustrial societies, theorizing that the redistribution of resources is an important factor in this relationship. Results indicate that these two types of development have a curvilinear relationship, and the author concludes that economic development is a necessary but not sufficient cause of political development in preindustrial societies.

What explains global variation in sex ratio at birth? To address this question, the authors present the results of their previous research on sex ratio at birth (2003), and additionally introduce new research on the correlations between sex ratio and marriage costs, such as a dowry or brideprice. Using a phylogenetic approach, the authors find that there is no correlation between sex ratio at birth and marriage payments. Analysis is restricted to the Old World.

This article reviews theories of marital power and tests for a relationship between wives’ contribution to subsistence and their conjugal power in patriarchal cultures. Results indicate a positive association. The role of cultural complexity is also considered; its relationship with wives’ power is negative and linear while its relationship with wives’ contribution to subsistence is negative and non-linear.

This book investigates individual and group responses to death and the problems that death can create in a society. Several hypotheses regarding grief and mourning, as well as their variation with other societal variables, are supported with cross-cultural tests.

In order to examine the development of lexical numbers (LN), the linguistic rules which allow for expression of high quantities and complex numerical operations, Overmann examines LN's association with grammatical number (GN), an expression of quantity based on the distinction between singular and multiple entities. LN and GN generally occur together, but LN is also found in a significant number of societies lacking GN, indicating that the two are both independent and related. A subsequent analysis of geographic distribution of LNs and GN indicates that LN may emerge prior to GN as a result of the interaction of numerosity (the ability to perceive different quantities) with tactile engagement with material structures (e.g. tools, the hand) which may subsequently lead to the development of GN. Overmann examines the theoretical implications of and explanations for these findings, and discusses how the present study contributes to the knowledge of linguistic frameworks.

This study tests competing theories about whether it is men, women, or parents who benefit most from restricting female premarital sex (FPS) in a global sample of 128 non-industrial societies. The study found support for the idea that multiple parties benefit from restrictions on FPS -- specifically FPS is more restricted in societies intolerant of extramarital sex and where men transfer property to their children (male control), as well as where marriages are arranged by parents (parental control). They also found that major predictors of FPS appear to be paternity uncertainty and parent-offspring conflict. Furthermore, the study found that multiple factors such as social roles, rather than stereotyped sex roles, are a more useful approach in understanding FPS restrictions and these restrictions.