Neuroanthropology has collected videos of trance states in religious rituals, where intense movement, music and mental involvement lead to profoundly altered states of consciousness.
Trance is a fundamental part of many (probably most) religions. Although it is typically associated in the popular mind with ‘voodoo’ it’s also common in many Christian denominations.
Indeed, there’s a video of trance states in Candombl√©, a fusion of Catholicism and voodoo-related Orisha worship, and one of trance states in a charismatic Christian church in the US.
Trance is usually described as involving ‘dissociation’ – originally defined by the French psychiatrist Pierre Janet as the ‘unconscious compartmentalisation of normally integrated mental functions’.
Dissociation is thought to underlie a wide range of phenomena, including hypnosis, reaction to trauma, trance and some forms of spirit possession, hysteria, conversion disorder and, more controversially, multiple personality disorder.
One of the best guides to the range of experiences and the possible neuroscience behind these states is an excellent article by anthropologists Rebecca Seligman and Laurence Kirmayer.
One notable omission from the list on Neuroanthropology is video of the female possession rituals of the Zar Cult from Northern Sudan which has been quite widely discussed in the anthropology literature.