Although not present in every New Age group, a core belief within the milieu is in channeling. This is the idea that humans beings, sometimes (although not always) in a state of trance, can act "as a channel of information from sources other than their normal selves". These sources are varyingly described as being God, gods and goddesses, ascended masters, spirit guides, extraterrestrials, angels, devas, historical figures, the collective unconscious, elementals, or nature spirits. Hanegraaff described channeling as a form of "articulated revelation", and identified four forms: trance channeling, automatisms, clairaudient channeling, and open channeling.