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Short description: Field of psychology

Near-death studies is a field of psychology and psychiatry that studies the physiology, phenomenology and after-effects of the near-death experience (NDE). The field was originally associated with a distinct group of North American researchers that followed up on the initial work of Raymond Moody, and who later established the International Association for Near-Death Studies (IANDS) and the Journal of Near-Death Studies. Since then the field has expanded, and now includes contributions from a wide range of researchers and commentators worldwide. Research on near-death experiences is mainly limited to the disciplines of medicine, psychology and psychiatry.

Near-death experience

Main page: Biology:Near-death experience

The near-death experience is an experience reported by people who have come close to dying in a medical or non-medical setting. The aspect of trauma, and physical crises, is also recognized as an indicator for the phenomenon.[1] Five percent of the adult American population have had an NDE, according to Linda J. Griffith[2] and Bruce Greyson.[3] Surveys conducted in the US, Australia and Germany suggest that 4 to 15% of the population have had NDEs, according to IANDS.[4] Researchers study the role of physiological, psychological and transcendental factors associated with the NDE.[5] These dimensions are also the basis for the three major explanatory models for the NDE.

Some general characteristics of an NDE include: subjective impressions of being outside the physical body; visions of deceased relatives and religious figures; and transcendence of ego and spatiotemporal boundaries.[6][7]

NDE researchers have also found that the NDE is not a uniquely western experience. Several elements and features of the NDE appear to be similar across cultures,[5][7][8][9][10][11] but the details of the experience (figures, beings, scenery), and the interpretation of the experience, vary between cultures.[7][8][10][12] However, a few researchers have "challenged the hypothesis that near-death experience accounts are substantially influenced by prevailing cultural models".[13]

Scientists correlate these events to a stressed and dying brain. These visions and life changes could be caused by oxygen shortage, imperfect anesthesia and the body's neurochemical responses to trauma.[14] But many NDErs still believe that they were more than just simple hallucinations or dreams. They believe these messages and the experience happened to them for a greater reason.[14]

Elements of the NDE

According to the NDE-scale[10][15] a near-death-experience includes a few, or several, of the following 16 elements:

  1. Time speeds up or slows down.
  2. Thought-processes speed up.
  3. A return of scenes from the past.
  4. A sudden insight, or understanding.
  5. A feeling of peace or pleasantness.
  6. A feeling of happiness, or joy.
  7. A sense of harmony or unity with the universe.
  8. Confrontation with a brilliant light.
  9. The senses feel more vivid.
  10. An awareness of things going on elsewhere, as if by extrasensory perception (ESP).
  11. Experiencing scenes from the future.
  12. A feeling of being separated from the body.
  13. Experiencing a different, unearthly world.
  14. Encountering a mystical being or presence, or hearing an unidentifiable voice.
  15. Seeing deceased persons or religious spirits.
  16. Coming to a border, or point of no return.

In a study published in The Lancet van Lommel and colleagues[7] list ten elements of the NDE: Note a

  1. Awareness of being dead.
  2. Positive emotions.
  3. Out of body experience.
  4. Moving through a tunnel.
  5. Communication with light.
  6. Observation of colours.
  7. Observation of a celestial landscape.
  8. Meeting with deceased persons.
  9. Life review.
  10. Presence of border.

After-effects

The NDE is associated with a number of after-effects,[2][6][7][8][16][17][18][19] or life-changing effects.[5][20] The effects, which are often summarized by researchers, include a number of value, attitude and belief changes[8][17] that reflect profound changes in personality,[8] and a new outlook on life and death, human relations, and spirituality.[2][6][16][21] Many of the effects are considered to be positive[2][20] or beneficial.[6][22] Van Lommel and colleagues conducted a "longitudinal follow-up research into transformational processes after NDEs" and found a "long-lasting transformational effect of the experience".[7]

However, not all after-effects are beneficial. The negative effects can be very large and prevalent. In some cases, changes in attitudes and behaviour can lead to distress and psychosocial, spiritual or physiological problems.[16][17][23]Note b The negative effects of NDE often have to do with adjustment to the new situation following a near-death experience, and the issues that comes with reintegration into ordinary life.[17] According to Bruce Greyson, those who experienced NDE may also have difficulty maintaining relationships due to the fear of rejection or being ridiculed when discussing the events.[24] This fear of being judged or ridiculed also causes a problem when needing to talk to a professional.[24] Some NDErs have received negative reactions from professionals, thereby discouraging many who are in need of help.[24] Consequently, many NDErs find great difficulty in sharing the experience of NDE and how it impacted their life.[24] Another category, so-called distressing or unpleasant near-death experiences, has been investigated by Greyson and Bush.[25]

Explanatory models

Explanatory models for the phenomenology and the elements of the NDE can, according to sources,[2][5][7][26][27][28][29] be divided into a three broad categories: psychological, physiological, and transcendental. In a study published in 1990, Owens, Cook and Stevenson[26] presented results that lent support to all of these three interpretations. Christian Agrillo[30] notes that literature reports two main theoretical frameworks: (1) "biological/psychological" (in-brain theories), or (2) "survivalist" (out-of-brain theories).

Each model contains a number of variables:

  • Psychological theories have suggested that the NDE can be a consequence of mental and emotional reactions to the perceived threat of dying,[5][7][20][26] or a result of expectation.[2][9][11] Other psychological variables that are considered by researchers include: imagination,[2][11] depersonalization,[2][11] dissociation,[2][11] proneness to fantasy,[2][11] and the memory of being born.[11]
  • Physiological theories tend to focus on somatic, biological or pharmacological explanations for the NDE, often with an emphasis on the physiology of the brain. Variables that are considered, and often summarized by researchers, include: anoxia;[7][9] cerebral hypoxia;[5][20][31] hypercarbia;[5][20] endorphins;[5][8][9][16][20][31] serotonin[5][8][11][20][31] or various neurotransmitters;[2][11][16] temporal lobe dysfunction or seizures;[2][5][8][9][11][20][31][32] the NMDA receptor;[5][20][31] activation of the limbic system;[5][20] drugs;[5][9][20][31] retinal ischemia;[11] and processes linked to rapid eye-movement sleep or phenomena generated on the border between sleep and wakefullness.[2][11][32][33][34]
  • Transcendental theories,[2][5][7][8][26][27] consider a number of categories that fall outside the scope of physiological or psychological explanations. This explanatory model considers whether the NDE might be related to: the existence of an afterlife,[26][27] a changing state of consciousness,[7] mystical (peak) experiences,[5] or mind-body separation.[27]

Several researchers in the field have expressed reservations towards explanations that are purely psychological or physiological.[2][7][20][34][35][36] Van Lommel and colleagues[7] have argued for the inclusion of transcendental categories as part of the explanatory framework. Other researchers, such as Parnia, Fenwick,[20] and Greyson,[10][36] have argued for an expanded discussion about the mind-brain relationship as well as the possibilities of human consciousness.

Research – history and background

Precursors

Individual cases of NDEs in literature have been identified in ancient times.[37] During the 1880s and 1890s, near-death phenomena were part of the investigation of paranormal phenomena.[38] Precursors to the field of near-death studies include the work of paranormal investigators, such as William Crookes and Frederick W.H. Myers, and the work of parapsychological societies, such as the Society for Psychical Research (SPR) in England, and its American counterpart.[38] The work attracted skepticism from contemporary branches of science.[38] Also in the 1800s, two efforts moved beyond studying individual cases—one privately done by Mormons and one in Switzerland.[37]

The early 1900s was a period of disinterest in the topic, only marked by occasional contributions, including the commentaries of Gardner Murphy and the research of Donald West. In 1948 West investigated the occurrence of psi-phenomena in a small sample of the British population. He found that "14 percent of his sample had undergone a hallucinatory experience and 9 percent had reported seeing apparitions of the dead".[38] During the 1970s the work of Elisabeth Kübler-Ross attracted attention and she addressed the topic publicly.[39][38] Interest in the topic was also spurred by autobiographical accounts, such as the books of George Ritchie.[2][40][41]

Formative period - early profiles

Commentators[42][43] note that the launch of the field of near-death studies started with work of Raymond Moody. Moody got interested in the subject of near-death experiences at the start of his career. In the mid-seventies, while doing his medical residency as a psychiatrist at the University of Virginia, he conducted interviews with near-death experiencers.[10] He later published these findings in the book Life After Life (1976).[44] In the book Moody outlines the different elements of the NDE. These features were picked up by later researchers, and the book brought public attention to the topic of NDEs.[8][10]

Early contributions to the field of near-death studies also include the work of Russell Noyes, who collected NDE stories from personal accounts and medical records.[38] According to commentators his work signalled the first big shift in perspective within the field, pulling the methodology away from parapsychology and towards the principles of medicine.[38] In the 1970s Noyes and Kletti reported on the phenomenon of depersonalization related to life-threatening danger.[45][46][43]

The late seventies saw the establishment of the Association for the Scientific Study of Near-Death Phenomena, an initial group of academic researchers, including John Audette, Raymond Moody, Bruce Greyson, Kenneth Ring and Michael Sabom, who laid the foundations for the field of near-death studies, and carried out some of the first NDE research in the wake of Moody's work.[47][42] The Association was a forerunner to the International Association for Near-death Studies (IANDS), which was founded in the early eighties and which established its headquarters at the University of Connecticut, Storrs.[48][49] This group of researchers, but especially Ring, was responsible for launching Anabiosis, the first peer-reviewed journal within the field. The journal later became Journal of Near-Death Studies.[2]

Even though NDEs were introduced to the academic setting, the subject was often met with academic disbelief,[50] or regarded as taboo.[8] The medical community has been reluctant to address the phenomenon of NDEs,[8][10] and funding for research has been limited.[8] However, both Ring and Sabom made contributions that were influential for the newly established field. Ring published a book in 1980 called Life at Death: A Scientific Investigation of the Near-Death Experience.[51][52] In the book Ring identified the core near-death experience, with its corresponding stages.[53] This early research was followed in 1984 by Ring's book Heading Toward Omega: In Search of the Meaning of the Near-Death Experience,[47][54] where he described the mystical and transcendent features of the NDE, and the futuristic visions described by near-death experiencers.[55] The early work of Michael Sabom also brought attention within the academic community. Besides contributing material to academic journals,[56] he wrote a book called Recollections of Death (1982)[57] which is considered to be a significant publication in the launching of the field.[47]

Some of the early retrospective work was being carried out by Greyson and Stevenson who published their findings in the American Journal of Psychiatry in 1980. The authors used questionnaires, interviews, and medical records in order to study the phenomenology of NDEs and suggested that social and psychological factors explained some, but not all, components of the NDE.[58][59] Greyson has also addressed different aspects of the NDE, such as the psychodynamics of the experience,[60] the typology of NDEs,[61] the varieties of NDEs,[3] and the biology of NDEs.[62] In addition, he brought attention to the NDE as a focus of clinical attention,[16] suggesting that the aftermath of the NDE, in some cases, can lead to psychological problems. As research in the field progressed, both Greyson and Ring developed measurement tools that can be used in a clinical setting.[15][63] According to Kinsella,[42] no other researcher, besides Moody, has done more to "influence public opinion on the subject of NDEs" than Kenneth Ring. However, Bruce Greyson has the greatest output of material and remains the leading scholar in the field.[43]

The 1980s also introduced the research of Melvin Morse, who profiled near-death studies.[64] Morse and colleagues[65][66] investigated NDEs in a pediatric population. They found that children reported NDEs that were similar to those described by adults. Morse later published two books, co-authored with Paul Perry, that were aimed at a general audience: Closer to the light: learning from children's near-death experiences (1990)[67] and Transformed by the light: the powerful effect of near-death experiences on people's lives (1992).[68] British neuropsychiatrist Peter Fenwick started to collect NDE stories in the 1980s, following their appearances in television programs.[69][43] The responses from near-death experiencers later served as the basis for his book published in 1997, The Truth in the light, co-authored with his wife Elizabeth Fenwick.[70] In the book the authors investigated more than 300 NDEs and concluded that the "subjective experience" is the key to understanding the phenomenon of NDEs.[71] Co-operating with other researchers, such as Sam Parnia, Fenwick has reviewed[20][31] and researched[5] the potential relationship between near-death experiences and cardiac arrest.

Early investigations into the topic of near-death experiences were also conducted at the University of Virginia, where Ian Stevenson founded the Division of Perceptual Studies in the late sixties.[72] The division went on to produce research on a number of phenomena that were not considered to be mainstream. In addition to near-death experiences this included: reincarnation and past lives, out-of-body experiences, apparitions and after-death communications, and deathbed visions.[10][73] Stevenson, whose main academic interest was the topic of reincarnation and past lives,[74][75] also made contributions to the field of near-death studies.[26][76] In a 1990 study, co-authored with Owens and Cook, the researchers studied the medical records of 58 people who were thought to have been near death. The authors judged 28 candidates to actually have been close to dying, while 30 candidates, who merely thought they were about to die, were judged to not have been in any medical danger. Both groups reported similar experiences, but the first group reported more features of the core NDE than the other group.[8][26]

According to Loseu and colleagues,[43] who published an analysis of the published literature in the field of near-death studies, there was a peak in the output of articles in the 15-year period between 1980 and 1995, followed by a decreasing trend.

Later period - new profiles, prospective studies

The first decades of near-death research were characterized by retrospective studies.[2][5][7][20][27][77][78] From 1975 to 2005, some 2500 self reported individuals in the US had been reviewed in retrospective studies of the phenomena[37] with an additional 600 outside the US in the West,[37] and 70 in Asia.[37] However, the late 1980s marked the beginning of prospective studies in the field. Prospective studies (which are more expensive) review groups of individuals and find who had an NDE. They had identified 270 individuals by 2005.[37]

Pim van Lommel (cardiologist) was one of the first researchers to bring the study of NDEs into the area of Hospital Medicine. In 1988 he launched a prospective study that spanned 10 Dutch hospitals. 344 survivors of cardiac arrest were included in the study.[7][34][79] 62 patients (18%) reported NDE. 41 of these patients (12%) described a core experience. The aim of the study was to investigate the cause of the experience, and assess variables connected to frequency, depth, and content.[7] Prospective studies were also taking place in the U.S. Schwaninger and colleagues[80] collaborated with Barnes-Jewish Hospital, where they studied cardiac arrest patients over a three-year period (April 1991 – February 1994). Only a minority of the patients survived, and from this group 30 patients were interviewable. Of these 30 patients 23% reported an NDE, while 13% reported an NDE during "a prior life-threatening illness".

In a prospective study from 2001, conducted at Southampton General Hospital, Parnia and colleagues found that 11.1% of 63 cardiac-arrest survivors reported memories of their unconscious period. Several of these memories included NDE features.[5]Note c Greyson[35] conducted a 30-month survey of patients admitted to the cardiac inpatient service of the University of Virginia Hospital. He found that NDEs were reported by 10% of patients with cardiac arrest and 1% of other cardiac patients. Up to 2005, 95% of world cultures have been documented making some mention of NDEs.[37] In all, close to 3500 individual cases between 1975 and 2005 had been reviewed by some 55 researchers or teams of researchers.[37]

During the next decade prospective studies were also starting to emerge from other parts of the world. In a study from 2010 Klemenc-Ketis and colleagues reported on out-of-hospital cardiac arrest survivors, later admitted to intensive care units, at medical centers in Slovenia. 21.2% of the patients in the study reported NDEs. The researchers also found that "NDE occur more often in patients with higher petCO2 and pCO2"; "higher serum levels of potassium correlate with higher score on Greyson’s NDE scale"; and "NDEs occur more often in patients with previous NDEs".[81]

The work of Jeffrey Long has also attracted attention to the topic of NDEs in both the academic, and the popular field.[82][83] Long is a near death experience researcher who believes in life after death.[84] In 2010 he released a book, co-authored with Paul Perry, called Evidence of the Afterlife: The Science of Near-Death Experiences. In the book Long presented results from research conducted over the previous decade.[85]

Based on the results from an analysis of scholarly NDE-related periodical literature, the decade between 2001 and 2011 signaled an expansion of the field of near-death studies by including new authors and new publication venues.[43] Research has also entered into other fields of interest, such as the mental health of military veterans. Goza, Holden & Kinsey studied NDEs among combat veterans. They found, among other things, that combat soldiers reported "less intense" near-death experiences, compared to NDErs in the civilian population.[86]

The first clinical paper from The AWARE-project (AWAreness during REsuscitation), another prospective study, was published in 2014. The research was a multicenter observational study including US, UK and Austrian medical sites.[87][88][89][14][90][79] In the study Parnia and colleagues[87] found that 9% of patients who completed stage 2 interviews reported experiences compatible with NDEs. A follow-up study, AWARE II, was completed in November 2022 (not yet peer-reviewed), and has resulted in 28 participants completing interviews, with 6 reporting a NDE. [91]

In a study from 2020[92] Charland-Verville and colleagues studied the near-death experiences of 158 participants through text mining. This study found that analyzing these experiences by the way participants explain them through speech can allow researchers to understand even more about NDEs, rather than just relying on the memories and self-reports of participants, which are less confidential than scientific evidence. It was also demonstrated that non-verbal communication like gestures and emotions can allow researchers to further understand NDEs and their effect on people who have had them.

Psychometrics

Several psychometric instruments have been adapted to near-death research. In 1980,[93] Ring developed the Weighted Core Experience Index in order to measure the depth of NDEs,[15] and this index has been used by other researchers for this purpose.[94] The index has also been used to measure the impact of near-death experiences on dialysis patients.[95] According to some commentators[2] the index has improved the consistency in the field. However, Greyson notes that although the index is a "pioneering effort", it is not based on statistical analysis, and has not been tested for internal coherence or reliability.[15] In 1984 Ring developed an instrument called the Life Changes Inventory (LCI) in order to quantify value changes following an NDE. The instrument was later revised and standardized and a new version, the LCI-R, was published in 2004.[96]

Greyson[15] developed The Near-Death Experience Scale. This 16-item scale was found to have high internal consistency, split-half reliability, and test-retest reliability[6][15] and was correlated with Ring's Weighted Core Experience Index. Questions formulated by the scale address such dimensions as: cognition (feelings of accelerated thought, or "life-review"), affect (feelings of peace and joy), paranormal experience (feelings of being outside of the body, or a perception of future events) and transcendence (experience of encountering deceased relatives, or experiencing an unearthly realm). A score of 7 or higher out of a possible 32 was used as the standard criterion for a near-death experience.[6] The scale is, according to the author,[6][15] clinically useful in differentiating NDEs from organic brain syndromes and nonspecific stress responses. The NDE-scale was later found to fit the Rasch rating scale model.[97] The instrument has been used to measure NDEs among cardiac arrest survivors,[5][87] coma survivors,[98] out-of-hospital cardiac arrest patients/survivors,[28][99][100] substance misusers,[101] and dialysis patients.[95]

In the late 1980s Thornburg developed the Near-Death Phenomena Knowledge and Attitudes Questionnaire.[102] The questionnaire consists of 23 true/false/undecided response items assessing knowledge, 23 Likert scale items assessing general attitudes toward near-death phenomena, and 20 Likert scale items assessing attitude toward caring for a client who has had an NDE.[103] Content validity was established by using a panel of experts selected from nursing, sociology, and psychology. The instrument was also found to satisfy the criteria for internal consistency.[102] The instrument has been used to measure attitudes toward, and knowledge of, near-death experiences in a college population,[104] among clergy,[105] among registered psychologists,[102] and among hospice nurses.[103]

Martial and colleagues [106] developed the Near-Death Experience Content (NDE-C) scale, a 20-item scale constructed in order to reassess the Greyson NDE-scale and to validate the new NDE-C scale. The authors found weaknesses in the original NDE-scale, but good psychometric properties for the new NDE-C scale.

Greyson has also used mainstream psychological measurements in his research, for example: The Dissociative Experiences Scale,[17] a measure of dissociative symptoms; and The Threat Index,[107] a measure of the threat implied by one's personal death.

Near death studies community

Research organizations and academic locations

The field of near-death studies includes several communities that study the phenomenology of NDEs. One of the most influential is IANDS, an international organization based in Durham, North Carolina, US, that promotes research and education on the phenomenon of near-death experiences.[42][108] Among its publications is the peer-reviewed Journal of Near-Death Studies.[2][42] The organization also maintains an archive of near-death case histories for research and study.[109]

Another research organization, the Louisiana-based Near Death Experience Research Foundation, was established by radiation oncologist Jeffrey Long in 1998.[82][83][110] The foundation maintains a website and a database of near-death cases.[83]

Several universities have been associated with near-death studies: the University of Connecticut (US),[6] Southampton University (UK),[111] University of North Texas (US)[112] and the Division of Perceptual Studies at the University of Virginia (US).[10][13][78]

Conferences

IANDS holds conferences on the topic of near-death experiences. The first meeting was a medical seminar at Yale University, New Haven, Connecticut, in 1982. The first clinical conference was in Pembroke Pines, Florida, and the first research conference was in Farmington, Connecticut in 1984. Since then conferences have been held in major U.S. cities, almost annually.[113] Many of the conferences have addressed a specific topic, defined in advance of the meeting. In 2004 participants gathered in Evanston, Illinois under the headline: "Creativity from the light".[40][114] A few of the conferences have been arranged at academic locations. In 2001 researchers and participants gathered at Seattle Pacific University.[115] In 2006 the University of Texas MD Anderson Cancer Center became the first medical institution to host the annual IANDS conference.[116]

The first international medical conference on near-death experiences was held in 2006.[34] Approximately 1,500 delegates, including people who claim to have had NDEs, attended the one-day conference in Martigues, France. Among the researchers at the conference were Moody and anesthetist and intensive care doctor Jean-Jacques Charbonnier.[117]

Relevant publications

IANDS publishes the quarterly Journal of Near-Death Studies, the only scholarly journal in the field.[2] IANDS also publishes Vital Signs, a quarterly newsletter that is made available to its members and that includes commentary, news and articles of general interest.[118]

One of the first introductions to the field of near-death studies was A Collection of Near-Death Research Readings: Scientific Inquiries Into the Experiences of Persons Near Physical Death, edited by Craig R. Lundahl and released in 1982.[119][120] An early general reader was The Near-Death Experience: Problems, Prospects, Perspectives, published in 1984.[121] In 2009, the Handbook of Near-Death Experiences: thirty years of investigation was published. It was an overview of the field based on papers presented at the IANDS conference in 2006.[37][122] Making Sense of Near-Death Experiences: A Handbook for Clinicians was published in 2011.[123] The book had many contributors and described how the NDE could be handled in psychiatric and clinical practice.[124] In 2017 the University of Missouri Press published The Science Of Near-death Experiences,[125] a compilation of articles that were originally published in the medical journal Missouri Medicine between 2013 and 2015.[126]

Recognition and criticism

According to literature[37] the field of near-death studies is associated with discovery, challenges, and controversy. Skepticism towards the findings of near-death studies, and the validity of the near-death experience as a subject for scientific study, has been widespread. According to Knapton, in The Daily Telegraph,[127] the subject was, until recently, controversial. Both scientists and medical professionals have, in general, tended to be skeptical.[8][128][129][130] According to commentators in the field[50] the early study of near-death experiences was met with "academic disbelief". Acceptance of NDEs as a legitimate topic for scientific study has improved,[8] but the process has been slow.[10] According to literature[2] "psychiatrists have played a role in the recognition of the "near-death" phenomenon as well as popularization of the subject and subsequent research". Kinsella[42] noted that "Growing scholarly interest has followed popular interest in the subject".

Skeptics have remarked that it is difficult to verify many of the anecdotal reports that are being used as background material in order to outline the features of the NDE.[8][82]

Internet Infidels commentator Keith Augustine has criticized the survivalist interpretation of NDEs. He also criticized "weaknesses in the research methodology, paucity of the data, and gaps in the arguments".[131][132] Greyson responded by suggesting that the materialist model favored by Augustine is supported by even less data than the "mind-brain separation model" favored by many researchers within the field of near-death studies.[132]

The findings of NDE research have been contested by several writers in the fields of psychology and neuroscience. Susan Blackmore[82] has contested the findings of NDE research, and has instead argued in favour of a neurological explanation. Psychologist Christopher French[27][77] has reviewed several of the theories that have originated from the field of near-death studies. This includes theories that present a challenge to modern neuroscience by suggesting a new understanding of the mind-brain relationship in the direction of transcendental, or paranormal, elements. In reply to this French considers the conventional scientific understanding, and introduces several non-paranormal factors, as well as psychological theory, that might explain those near-death experiences that defy conventional scientific explanations. However, he does not rule out a future revision of modern neuroscience, awaiting new and improved research procedures.

Jason Braithwaite, a Senior Lecturer in Cognitive Neuroscience in the Behavioural Brain Sciences Centre, University of Birmingham, issued an in-depth analysis and critique of the survivalist's neuroscience of some NDE researchers, concluding, "it is difficult to see what one could learn from the paranormal survivalist position which sets out assuming the truth of that which it seeks to establish, makes additional and unnecessary assumptions, misrepresents the current state of knowledge from mainstream science, and appears less than comprehensive in its analysis of the available facts."[133]

Martens[100] noted the "lack of uniform nomenclature", and "the failure to control the studied population with an elimination of interfering factors", as examples of criticism directed towards near-death research. Engmann[134] points out that NDE research does not fulfil quality criteria of medical studies, namely objectivity.

But criticism of the field has also come from commentators within its own ranks. In an open letter to the NDE community Ring has pointed to the "issue of possible religious bias in near-death studies". According to Ring the field of near-death studies, as well as the larger NDE movement, has attracted a variety of religious and spiritual affiliations, from a number of traditions, which makes ideological claims on behalf of NDE research. In his view this has compromised the integrity of research and discussion.[47]

See also

Notes

a.^ van Lommel et.al, 2001: Table 2
b.^ The diagnostic label of "Religious or spiritual problem" is included in DSM-IV under the category of "Other conditions that may be a focus of clinical attention". See American Psychiatric Association (1994) "Diagnostic and Statistical Manual of Mental Disorders", fourth edition. Washington, D.C.: American Psychiatric Association (Code V62.89, Religious or Spiritual Problem).
c.^ Reported memories were assessed by the Greyson NDE Scale.

References

  1. ↑ Sommers MS. The near-death experience following multiple trauma. Crit Care Nurse. 1994 Apr;14(2): 62–66.
  2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 Griffith, Linda J. Near-Death Experiences and Psychotherapy, Psychiatry (Edgmont). 2009 October; 6(10): 35–42.
  3. ↑ 3.0 3.1 Greyson B. "Varieties of near-death experience". Psychiatry. 1993 Nov;56(4): 390–99.
  4. ↑ IANDS. "Near-death experiences: Key Facts". Informational Brochure published by the International Association for Near-death Studies. Durham, NC. Updated 7.24.07
  5. ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 5.11 5.12 5.13 5.14 5.15 5.16 5.17 5.18 Parnia S, Waller DG, Yeates R, Fenwick P. A qualitative and quantitative study of the incidence, features and aetiology of near death experiences in cardiac arrest survivors. Resuscitation. Feb;48(2): 149–56, 2001 PubMed abstract PMID 11426476
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Greyson, Bruce. "Near-Death Experiences in a Psychiatric Outpatient Clinic Population". Psychiatric Services, Dec., Vol. 54 No. 12. The American Psychiatric Association, 2003
  7. ↑ 7.00 7.01 7.02 7.03 7.04 7.05 7.06 7.07 7.08 7.09 7.10 7.11 7.12 7.13 7.14 7.15 van Lommel P, van Wees R, Meyers V, Elfferich I. Near-Death Experience in Survivors of Cardiac Arrest: A prospective Study in the Netherlands. The Lancet. December 15, 2001; 358(9298): 2039–45. PMID 11755611
  8. ↑ 8.00 8.01 8.02 8.03 8.04 8.05 8.06 8.07 8.08 8.09 8.10 8.11 8.12 8.13 8.14 8.15 8.16 Mauro, James. Bright lights, big mystery. Psychology Today, July 1992
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 Blackmore, "Susan J. Near-death experiences". "Journal of the Royal Society of Medicine", Volume 89, February 1996
  10. ↑ 10.0 10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 10.9 Graves, Lee. Altered States. Scientists analyze the near-death experience. The University of Virginia Magazine, Summer 2007 Feature
  11. ↑ 11.00 11.01 11.02 11.03 11.04 11.05 11.06 11.07 11.08 11.09 11.10 11.11 Facco, Enrico & Agrillo, Christian. Near-death experiences between science and prejudice. Frontiers in Human Neuroscience. 2012; 6: 209.
  12. ↑ Belanti, John; Perera, Mahendra and Jagadheesan, Karuppiah. Phenomenology of Near-death Experiences: A Cross-cultural Perspective. Transcultural Psychiatry, 2008 45: 121.
  13. ↑ 13.0 13.1 Athappilly G, Greyson B, Stevenson I. Do Prevailing Societal Models Influence Reports of Near-Death Experiences? A Comparison of Accounts Reported Before and After 1975. The Journal of Nervous and Mental Disease, Volume 194, Number 3, March 2006.
  14. ↑ 14.0 14.1 14.2 Lichfield, Gideon (2015-03-17). "The Science of Near-Death Experiences" (in en). https://www.theatlantic.com/magazine/archive/2015/04/the-science-of-near-death-experiences/386231/. 
  15. ↑ 15.0 15.1 15.2 15.3 15.4 15.5 15.6 Greyson, Bruce. The near-death experience scale. Construction, reliability, and validity. Journal of Nervous and Mental Disease, Jun;171(6): 369–75, 1983
  16. ↑ 16.0 16.1 16.2 16.3 16.4 16.5 Greyson, Bruce. The near-death experience as a focus of clinical attention. Journal of Nervous and Mental Disease, May;185(5): 327–34, 1997
  17. ↑ 17.0 17.1 17.2 17.3 17.4 Greyson, B. Dissociation in people who have near-death experiences: out of their bodies or out of their minds? The Lancet. Feb 5;355(9202): 460–63, 2000
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  19. ↑ Weintraub, Pamela. Seeing the Light. Psychology Today, September/October 2014
  20. ↑ 20.00 20.01 20.02 20.03 20.04 20.05 20.06 20.07 20.08 20.09 20.10 20.11 20.12 20.13 20.14 Parnia S, Fenwick P. Near death experiences in cardiac arrest: visions of a dying brain or visions of a new science of consciousness. Resuscitation. 2002 Jan;52(1): 5–11
  21. ↑ "Near-Death Experiences (NDEs)" (in en-US). https://med.virginia.edu/perceptual-studies/our-research/near-death-experiences-ndes/. 
  22. ↑ Sartori, Dr. Penny (2014). The wisdom of near-death experiences : how understanding NDEs can help us live more fully. Watkins Media. pp. Chapter 9, Section: Therapeutic Benefits. ISBN 978-1-5252-3092-9. OCLC 969395726. http://worldcat.org/oclc/969395726. 
  23. ↑ Orne RM. The meaning of survival: the early aftermath of a near-death experience. Research in Nursing & Health. 1995 Jun;18(3): 239–47. PubMed abstract PMID 7754094
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  25. ↑ Greyson B, Bush NE. Distressing near-death experiences. Psychiatry. 1992 Feb;55(1): 95–110.
  26. ↑ 26.0 26.1 26.2 26.3 26.4 26.5 26.6 Owens J, Cook E W, Stevenson I. Features of "near-death experience in relation to whether or not patients were near death. The Lancet, Volume 336, Issue 8724, November 10, 1990, pp. 1175–77.
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  31. ↑ 31.0 31.1 31.2 31.3 31.4 31.5 31.6 Parnia S, Spearpoint K, Fenwick PB. Near death experiences, cognitive function and psychological outcomes of surviving cardiac arrest. Resuscitation. 2007 Aug;74(2): 215–21.
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  37. ↑ 37.0 37.1 37.2 37.3 37.4 37.5 37.6 37.7 37.8 37.9 Holden, Janice Miner; Greyson, Bruce; James, Debbie, eds (2009). "The Field of Near-Death Studies: Past, Present and Future". The Handbook of Near-Death Experiences: Thirty Years of Investigation. Greenwood Publishing Group. pp. 1–16. ISBN 978-0-313-35864-7. https://books.google.com/books?id=9MdUPgAACAAJ. 
  38. ↑ 38.0 38.1 38.2 38.3 38.4 38.5 38.6 Walker, Barbara & Serdahely, William. Historical Perspectives on Near-Death Phenomena. Journal of Near-Death Studies, 9(2) Winter 1990, pp. 105-121
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  44. ↑ Moody Raymond A. (1976). Life after life : the investigation of a phenomenon – survival of bodily death. Harrisburg, Pa. : Stackpole Books.
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  67. ↑ Morse, Melvin (with Paul Perry) (1990) Closer to the light : learning from children's near-death experiences. New York : Villard Books
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