This chapter reviews various ethnographic and psychological studies of dreaming and hypothesizes about the relationship between institutionalized forms of trance and the use of dreams. Results show that societies with institutionalized forms of trance are more likely to use dreams to seek and control supernatural powers.

This article investigates a cultural patterning of altered states of consciousness. The authors use an ordinal variable for a society's trance type; its four levels are 1) trance, 2) trance and possession trance, 3) possession trance, and 4) neither type. Results suggest that trance type is associated with measures of societal complexity and subsistence economy. Regional differences and the effects of diffusion are also examined.

This book investigates possession and possession-trance. While the author focuses on a case study of Haiti, there are also a handful of cross cultural tests performed. Results suggest that societal complexity is associated with belief in possession-trance, rather than possession alone.

This book provides a summary of data available in the Ethnographic Atlas. Social, political, economic, and kinship variables are included, as well as information about religious beliefs, social restrictions, and games. Data is divided into world areas for the purposes of regional comparison.

The expressed purpose of the present publication is to provide a typology of institutionalized dissociational states on a world-wide basis, using biological, situational, and cultural parameters. The study is comprised of field work, literature review, ethnographic research, and cross-cultural statistical analysis. The researchers use these findings to aid in the construction of cross-cultural theory, and to provide a platform for further work on dissociational states to continue.