Possession trance was an accepted part of the Haitian vodou religion.

In addition to possession trance, Bourguignon also wrote about additional altered states of consciousness, including dreams, dreaming and multiple-personality disorder.

Multiple Personality, Possession Trance, and the Psychic Unity of Mankind.

The two women who represent the nagas in a possession trance come to the kalam and sit on the floor with an areca flower in hands.

Women, Possession Trance Cults, and the Extended Nutrient-Deficiency Hypothesis.

The animist traditions of the island of Bali (Indonesia) include a practice called sanghyang, induction of voluntary possession trance states for specific purposes.

Erika Eichhorn Bourguignon (February 18, 1924 - February 15, 2015) was an American anthropologist known primarily for her work on possession trance and other altered states of consciousness.

From 1970 through 1990 much of Bourguignon's academic work sprang from her fieldwork in Haiti, where her primary interest had been possession trance, a culturally sanctioned part of the Haitian Vodou religion.

As Deren (1953) reminded us in one of the earliest exegetic accounts on possession, she could not recall what had happened to her during a violent possession trance, but she certainly knew that it had taken place.