The researchers conducted four studies using multiple methods. All of the studies examined the ways in which conflict may shape religion, and, more specifically whether conflict relates to an increased belief in a punitive god. Study 2 compared individuals from four countries; study 4 used worldwide data. We don't report results from the American sample (study 1) or from study 3. As a result of all four studies, the researchers suggest that since beliefs in punitive gods are better able to preserve order and enforce traditions, they may be particularly attractive during times of conflict.

Does religion cause violent conflict? In order to examine this question, the researcher tests the correlation between occurrence of belief in a moralizing god and frequency of conflict events in sub-regional Africa, controlling for various geographic and biotic variables. A significant positive correlation prompts speculation about the theoretical mechanisms by which belief in a moralizing god, including unwillingness to compromise on sacred scripture and exclusionary group identity formation, could engender violent conflict.

This article investigates relationships among society size, war and conflict, preferred habitats, and belief in moralizing gods. The authors discuss morality and collective action in the face of natural disasters and competition for resources, theorizing that beliefs in moralizing gods could facilitate such cooperation.

This study examines husband-wife relationships, specifically rooming and sleeping arrangements, as they relate to variables such as infant care, subsistence, residence, and cultural complexity. Several hypotheses are tested and all are supported.

This article investigates relationships among society size, war and conflict, preferred habitats, and belief in moralizing gods. The authors discuss morality and collective action in the face of natural disasters and competition for resources, theorizing that beliefs in moralizing gods could facilitate such cooperation.

This study examines husband-wife relationships, specifically rooming and sleeping arrangements, as they relate to variables such as infant care, subsistence, residence, and cultural complexity. Several hypotheses are tested and all are supported.

Previous research into the origins of human violence and warfare has oftentimes been inconclusive and controversial. This paper examines two alternative theories as to the evolution of human violence using archaeological records on sharp force trauma (SFT) and blunt force trauma (BFT). The study is limited to 13 different California ethnolinguistic groups. Researchers find that violence is not predicted by sociopolitical complexity, but rather by environmental productivity. This supports the idea that in contexts of resource scarcity, the perceived benefits to engage in lethal aggression may outweigh perceived costs.

In this study, the author empirically tests a formulation of Ellen Dissanayake's evolutionary theory of art, which argues that art evolved to promote group cohesion. The hypotheses derived from this theory and tested in this study specifically focus on ritual art and its relationships to various proxies for group cohesion such as community conflict and internal warfare. Results show that the presence of ritual art is significantly higher where certain measures of group cohesion are also higher (including lower internal warfare, lower conflict between communities of the same society, and lower frequency of violent conflict between groups within local communities).

In this study, the author empirically tests a formulation of Ellen Dissanayake's evolutionary theory of art, which argues that art evolved to promote group cohesion. The hypotheses derived from this theory and tested in this study specifically focus on ritual art and its relationships to various proxies for group cohesion such as community conflict and internal warfare. Results show that the presence of ritual art is significantly higher where certain measures of group cohesion are also higher (including lower internal warfare, lower conflict between communities of the same society, and lower frequency of violent conflict between groups within local communities).

Drawing from Social Darwinism theories, this article posits warfare (specifically, military success) as a selective mechanism in the evolution of culture. The hypothesis was not supported.