This article explores ecological, religious, and social correlates of human sacrifice and cannibalism in a cross-cultural sample. Support is found for associations between human sacrifice and population density, population pressure, war for land and resources, and a low hierarchical focus of religion. Human sacrifice among Aztecs is given particular attention.

The authors examine the relationship between magico-religious practitioner type and socioeconomic variables in order to present a typology of magico-religious practitioners. Three bases for magico-religious practitioners are discussed in terms of selection procedures and activities. Several hypotheses are empirically tested, and descriptive generalizations derived from analyses are presented.

Expanding on the author’s previous findings, this article examines the social and economic variables that may explain the cultural evolution of religious practitioners. With a 47 society sample, the author found that subsistence activities and socio-political conditions predict magico-religious practitioner types (sorcerers/witches, priests, shamanistic healers, mediums, healers, shaman/healers, and shamans) with the strongest results being from subsistence and political organization. He then used these findings to theorize about the biogenetic bases of religion in societies.

This article offers a detailed analysis of neuropsychopsiological processes involved in altered states of consciousness (ASC) in order to design and evaluate a psychophysiological model of trance states. Cross-cultural hypotheses concerning ASC are tested.

This article examines shamans and other types of magico-religious healers. Agriculture and political integration are suggested to influence the transformation of shamans into shaman/healers, healers, or possession-trance mediums.

The social control hypothesis suggests that ritual human sacrifice may have played an important role in the evolution of social stratification, functioning to legitimize class-based power distinctions by pairing displays of ultimate authority with supernatural justifications. Authors test this hypothesis about human sacrifice with a phylogenetic analysis of 93 Austronesian cultures.

The author analyzes 440 Sub-Saharan African societies to test whether trade across ecologically diverse zones is predictive of degree of state centralization (state capacity or strength of state) in pre-colonial Africa. The author finds that diverse ecology is predictive of state capacity and that trade supports class stratification. The author also emphasizes the importance of historical contingency and ethnographic data consultation in understanding mechanisms in individual cases.

The second and third parts of this book classify the economic systems of foraging and agricultural societies in the SCCS based on correlations between their institutions of property an distribution. These economic types are then examined for relationships with other social, political, demographic, and environmental factors in order to draw tentative conclusions regarding the origins of the Agricultural and Industrial Revolutions. The fourth part of the book uses cross-national data to examine similar associations in industrial/service economies, and is not included here.

In this article, the authors seek to reevaluate Nolan's (2003) study on the primary determinants of war. They reanalyze his hypotheses with what they claim are more robust measures and methodology. They conclude that there is only a little evidence supporting Nolan's theories, that more productive technology and higher population density predict war, and that overall ecological-evolutionary and sociopolitical explanations of war are equally supported by empirical data.

This book investigates peaceful societies and the social and ecological conditions that discourage war. The author uses ethnographic examples, cross-cultural findings, primatology, and archaeology to examine war, social organization, human evolution, and conflict management.