The first extensive scientific study of OBEs was made by
Celia Green (1968).
[102] She collected written, first-hand accounts from a total of 400 subjects, recruited by means of appeals in the mainstream media, and followed up by questionnaires. Her purpose was to provide a
taxonomy of the different types of OBE, viewed simply as an anomalous perceptual experience or
hallucination, while leaving open the question of whether some of the cases might incorporate information derived by
extrasensory perception.
Previous collections of cases had been made by Dr. Ernesto Bozzano (Italy) and Dr. Robert Crookall (UK). Crookall approached the subject from a spiritualistic position, and collected his cases predominantly from spiritualist newspapers such as the
Psychic News, which appears to have biased his results in various ways. For example, the majority of his subjects reported seeing a
cord connecting the physical body and its observing counterpart; whereas Green found that less than 4% of her subjects noticed anything of this sort, and some 80% reported feeling they were a "disembodied consciousness", with no external body at all.
In 1981, Brazilian Physician and
medium Dr.
Waldo Vieira proposed a new field in
parapsychology called
projectiology,
[103] in which researchers study the subjective dynamics of the OBE directly through systematic self-experimentation rather than through verbal reports. He also formed an institution called the CCC -
Center of Continued Consciousness (later IIPC -
International Institute of Conscientiology), to promote discussions about the subject.
[104]
In 1999, at the 1st International Forum of Consciousness Research in Barcelona, International Academy of Consciousness research-practitioners Wagner Alegretti and Nanci Trivellato presented preliminary findings
[105] of an online survey on the out-of-body experience answered by internet users interested in the subject; therefore, not a sample representative of the general population.
1,007 (85%) of the first 1,185 respondents reported having had an OBE. 37% claimed to have had between two and ten OBEs. 5.5% claimed more than 100 such experiences. 45% of those who reported an OBE said they successfully induced at least one OBE by using a specific technique. 62% of participants claiming to have had an OBE also reported having enjoyed nonphysical flight; 40% reported experiencing the phenomenon of self-bilocation (i.e. seeing one's own physical body whilst outside the body); and 38% claimed having experienced self-permeability (passing through physical objects such as walls). The most commonly reported sensations experienced in connection with the OBE were falling, floating, repercussions e.g. myoclonia (the jerking of limbs, jerking awake), sinking, torpidity (numbness), intracranial sounds, tingling, clairvoyance, oscillation and serenity.
Another reported common sensation related to OBE was temporary or projective
catalepsy, a more common feature of sleep paralysis. The sleep paralysis and OBE correlation was later corroborated by the Out-of-Body Experience and Arousal study published in
Neurology [106] by Kevin Nelson et al. (2007). Also noteworthy, is the Waterloo Unusual Sleep Experiences Questionnaire
[107] that further illustrates the correlation.
William Buhlman, an author on the subject, has conducted an informal but informative online survey
[108] as well.
A study in 2007 led by Professor Kevin Nelson from the
University of Kentucky discovered that people who have out-of-body experiences are more likely to suffer from
sleep paralysis
I didnt expect you to. Have a good one brother