who developed theories about the power of the part of the mind called the unconscious
Unconscious mind The concept was popularized by the Austrian neurologist and psychoanalyst Sigmund Freud. In psychoanalytic theory, unconscious processes are understood to be directly represented in dreams, as well as in slips of the tongue and jokes.
Out-of-body experience The term out-of-body experience was introduced in 1943 by G. N. M. Tyrrell in his book Apparitions,[1] and was adopted by researchers such as Celia Green[2] and Robert Monroe[3] as an alternative to belief-centric labels such as "astral projection", "soul travel", or "spirit walking". OBEs can be induced by brain traumas, sensory deprivation, near-death experiences, dissociative and psychedelic drugs, dehydration, sleep, and electrical stimulation of the brain,[4] among others. It can also be deliberately induced by some.[5] One in ten people have an OBE once, or more commonly, several times in their life.[6][7]