A near-death experience (NDE) is a vivid, structured experience reported by some people who come close to death or are clinically dead for a short time, most often during cardiac arrest. Common features include a sense of peace, the feeling of leaving the body, a tunnel or darkness, a bright light, meeting deceased relatives or a "being of light," a review of one's life and a boundary beyond which there is no return. Researchers agree the experiences are real; they disagree about what causes them.
The question matters because it sits on one of the oldest debates there is: whether consciousness is produced by the brain or works through it. Hospital studies now pair survivors' memories with brain monitoring during resuscitation, moving the conversation from anecdote toward data, though that data is still thin and both skeptics and believers read it as support.
Who coined the term near-death experience
The phrase entered popular use with Raymond Moody's Life After Life, published in 1975, and Moody is generally credited with coining it. Moody compared roughly 150 accounts from people who had been resuscitated or had come close to dying. He described a recurring set of elements: difficulty putting the experience into words, hearing oneself pronounced dead, feelings of peace, a buzzing or ringing noise, moving through a dark tunnel, seeing one's own body from outside, meeting others, encountering a being of light, a panoramic review of one's life, reaching a border or limit, and coming back.
Moody noted that no single account contained every element, and the book was not a controlled study. It became an international bestseller and opened the field to clinical researchers.
Were near-death experiences reported before Moody
Yes. The best-known ancient example is the Myth of Er at the end of Plato's Republic (Book X). Er, a soldier killed in battle, revives on his funeral pyre on the twelfth day and describes a journey of souls, judgment and the choosing of new lives. Plato told it as a moral myth, but its death, journey and return structure is familiar.
In 1892 the Swiss geologist and mountaineer Albert Heim published "Notizen über den Tod durch Absturz" (Remarks on fatal falls) in the yearbook of the Swiss Alpine Club. Heim collected accounts from climbers who had survived falls, workers who had fallen from scaffolds and wounded soldiers, many describing calm, rapid thought and a review of their past. The psychiatrists Russell Noyes and Roy Kletti translated the paper into English in 1972, and it became one of the reference points for the modern field.
How researchers measure an NDE: the Greyson Scale
The most widely used yardstick is the Near-Death Experience Scale published by psychiatrist Bruce Greyson in the Journal of Nervous and Mental Disease in 1983. It has 16 questions covering four areas: changes in thinking (such as a life review), emotions (peace, joy), apparently paranormal features (out-of-body perception) and transcendent features (an unearthly realm, deceased spirits, a border). A score of 7 or more is the conventional threshold for classifying an experience as an NDE.
Greyson later directed the Division of Perceptual Studies at the University of Virginia. Around the same period, University of Connecticut psychologist Kenneth Ring published Life at Death (1980), which proposed his own weighted index and described NDEs as a continuum of stages, from peace and separation from the body to entering darkness, seeing a light and entering it. Standard scales let separate studies count the same thing.
What the Dutch Lancet study found
The first large prospective study, enrolling patients at the time of cardiac arrest rather than recruiting people with a story to tell, was led by cardiologist Pim van Lommel and published in The Lancet in 2001. It followed 344 consecutive survivors of cardiac arrest in 10 Dutch hospitals. Of these, 62 patients (18%) reported some recollection from the period of clinical death, and 41 (12%) described what the researchers classed as a core experience.
Two findings drew attention. The occurrence of an NDE was not explained by the duration of the arrest, the length of unconsciousness, the medication given or the patient's fear of death beforehand. Van Lommel argued that if lack of oxygen alone caused NDEs, most patients should have had one. Follow-up interviews at two and eight years found that people who had an NDE showed lasting changes, including less fear of death and more interest in the meaning of life, compared with survivors who had not.
What the AWARE studies tested
The AWARE (AWAreness during REsuscitation) studies, led by critical-care physician Sam Parnia, tried to test the out-of-body claim directly. The first study, published in the journal Resuscitation in 2014, recorded 2,060 cardiac arrests across 15 hospitals in the United Kingdom, the United States and Austria. Of 140 survivors interviewed, 101 completed a detailed follow-up; 9 of them met the Greyson threshold for an NDE and 2 described awareness with explicit recall of events.
One of those two, a 57-year-old man, accurately described people, sounds and activities from his own resuscitation, including the use of an automated external defibrillator, details the medical records supported. The researchers estimated up to three minutes of awareness. To test claims of seeing the room from above, the team had installed shelves with images visible only from the ceiling. The test largely failed for practical reasons: only about 22% of arrests happened in wards where shelves had been installed, and neither of the two patients with explicit recall had arrested in such a room.
AWARE II, published in Resuscitation in 2023, added continuous brain monitoring and a more controlled test. Across 25 hospitals, researchers followed 567 in-hospital cardiac arrests and used a computer to display an image and headphones to play an audio cue during CPR. Only 53 patients survived, 28 were interviewed, and 11 reported memories or perceptions suggesting consciousness. Six described what the authors call a "transcendent recalled experience of death." Nobody identified the visual image; one of the 28 identified the audio cue.
The EEG data drew the headlines. Despite reduced oxygen to the brain (mean cerebral oxygenation of 43%), the paper reports that normal EEG activity in the delta, theta and alpha ranges, consistent with consciousness, emerged as long as 35 to 60 minutes into CPR. NYU Langone's 2022 announcement of early findings also described spikes of gamma and beta activity. The authors concluded only that consciousness and cognitive processes may occur during cardiac arrest, and NYU noted that claims of awareness at death could be neither proven nor disproven.
What happens in the dying brain
Animal and human recordings suggest the brain does not simply switch off at the moment of cardiac arrest. In a 2013 study in the Proceedings of the National Academy of Sciences, Jimo Borjigin's team at the University of Michigan recorded a brief surge of highly coherent gamma activity in rats in roughly the first 30 seconds after induced cardiac arrest. Outside experts noted the rats were anesthetized and that brain rhythms alone cannot show what an animal experiences.
In 2023 the same group published a PNAS study of four comatose patients who died after removal from ventilator support. Two showed a surge of gamma activity in a region where the temporal, parietal and occipital lobes meet, an area linked to dreaming and to altered states. The sample was tiny and the patients did not survive, so nobody can say what they experienced. The site covered both lines of research when they broke, in the report on brain activity in dying patients and the report on "lucid dying" during CPR.
The physiological explanations
Researchers who see NDEs as products of a stressed brain point to several mechanisms, none of which accounts for everything on its own:
- Oxygen and carbon dioxide changes. Hypoxia (low oxygen) and hypercarbia (high carbon dioxide) have long been proposed as triggers for tunnel vision, lights and euphoria, though the Dutch data showed most anoxic patients did not report an NDE.
- REM intrusion. In a 2006 study in Neurology, Kevin Nelson's group at the University of Kentucky found that 60% of 55 people with NDEs reported episodes of dream-state intrusion into waking life, such as sleep paralysis, compared with 24% of matched controls.
- Brain stimulation. In 2002 Olaf Blanke and colleagues reported in Nature that electrically stimulating the right angular gyrus, near the temporo-parietal junction, in an epilepsy patient repeatedly produced out-of-body sensations.
- Drug-like states. A 2019 study in Consciousness and Cognition compared about 15,000 drug-experience reports involving 165 substances with 625 NDE narratives and found reports involving ketamine were the most similar.
- Expectation and culture. Researchers have noted that accounts vary by culture and religion in the figures people meet and how they interpret them, which suggests the experience is at least partly shaped by what the person already believes.
The survivalist reading and the veridical cases
The survivalist reading holds that consciousness is not produced by the brain and can continue, at least for a time, without it. Supporters point to clear memories formed during poor brain function, lasting changes in experiencers and, above all, "veridical" cases, where a person reports accurate details they apparently could not have perceived through normal senses.
The most cited of these is "Maria's shoe." Social worker Kimberly Clark reported in 1984 that a cardiac patient at Harborview Medical Center in Seattle in April 1977 described a tennis shoe on a ledge outside a third-floor window, which Clark then found. In a 1996 Skeptical Inquirer article, Hayden Ebbern, Sean Mulligan and Barry Beyerstein reported that when they placed a shoe on the ledge, it was easy to see from inside the room and from the ground, so Maria could have heard it mentioned. Disputes like this are why the AWARE team built hidden targets, which have so far produced no confirmed hit on the visual image.
Skeptics can show that pieces of the experience can be produced in the brain; survivalists respond that no model yet explains the full experience, or why it happens to some patients and not others.
Billy Carson's reading
Billy Carson approaches near-death experiences from his broader position that consciousness is primary rather than a by-product of brain chemistry. That is his interpretation, not an established scientific finding. It runs through his teaching on the holographic universe, in which he describes an informational layer of reality that consciousness can access, a view explored in the site's guide to the Akashic Records. Applied to near-death research, that position treats reports of awareness during cardiac arrest as consistent with a model in which the brain works with consciousness rather than producing it, the survivalist side of the debate described above.
Carson also reads the afterlife through ancient Egyptian thought. In his reading of the Egyptian Book of the Dead, the weighing of the heart is less a literal courtroom than a teaching about inner awareness: a person's accumulated intention and action shapes what happens to awareness after death. Readers will notice the parallel with the life review that many experiencers describe; that comparison is the editors' observation, and Carson's reading is an interpretive lens rather than a claim the Egyptian texts make in modern terms. The 4biddenknowledge Podcast episode When Death Stared Billy Carson in the Face is where to hear him on the subject of death directly.
Watch, read and go deeper
Start with the 4biddenknowledge Podcast episode When Death Stared Billy Carson in the Face. On 4BK TV, Beyond the Known investigates the paranormal and unsolved mysteries in a cinematic documentary format. For out-of-body experiences outside a medical crisis, read the explainer on lucid dreaming and astral projection. The consciousness topic hub gathers every article, episode and show on the nature of mind.
Frequently asked questions
How common are near-death experiences?
It depends on the definition. In the Dutch Lancet study, 18% of cardiac-arrest survivors reported some recollection and 12% a core experience; in AWARE I, 9 of 101 survivors given a full interview met the Greyson threshold. These figures describe survivors of cardiac arrest only.
Did the AWARE studies prove that consciousness survives death?
No. AWARE I verified one patient's recall of real events during resuscitation, and AWARE II recorded near-normal brain activity in some patients well into CPR and one correct identification of an audio cue. Nobody identified the hidden visual images, and the authors themselves concluded only that consciousness may occur during cardiac arrest.
Can science explain near-death experiences?
Partly. Low oxygen, REM-state intrusion, stimulation of the temporo-parietal region and drugs such as ketamine can each reproduce some features. No single mechanism yet explains the whole experience or why it happens to some patients and not others, which is why the debate remains open.
Are near-death experiences always positive?
No. Most reported NDEs are peaceful, but researchers, including Greyson, have documented distressing experiences involving fear, emptiness or hostile figures. Experiencers of both kinds often describe lasting changes afterward.
Sources and further reading
- Raymond A. Moody Jr., Life After Life (1975)
- Bruce Greyson, "The Near-Death Experience Scale: Construction, Reliability, and Validity," Journal of Nervous and Mental Disease 171 (1983)
- Kenneth Ring, Life at Death: A Scientific Investigation of the Near-Death Experience (1980)
- Pim van Lommel et al., "Near-death experience in survivors of cardiac arrest: a prospective study in the Netherlands," The Lancet 358 (2001)
- Sam Parnia et al., "AWARE—AWAreness during REsuscitation—A prospective study," Resuscitation 85 (2014); and "AWAreness during REsuscitation - II," Resuscitation (2023)
- Jimo Borjigin et al., Proceedings of the National Academy of Sciences (2013 and 2023 studies of the dying brain)
- Kevin Nelson et al., "Does the arousal system contribute to near death experience?" Neurology 66 (2006)
