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Can Science Explain Near Death Experiences?
An estimated 9 million people in the U.S. alone have had a transformative near-death experience. Scientists are grappling with what’s happening inside their heads.
An estimated 9 million people in the U.S. alone have had a transformative near-death experience. Scientists are grappling with what’s happening inside their heads.
www.discovermagazine.com
Probably should present some copy-paste excerpts, FWIW:
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This article appeared in the September/October 2021 issue of Discover magazine as "Death Defying." ...
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At the end of Plato’s Republic, the philosopher Socrates shares the myth of Er, a warrior who was killed in battle. Twelve days later, the man comes back to life to tell of the other world he had seen. His soul, he says, left his body to arrive in “a mysterious place,” where others were judged for their deeds and luminous beings descended from above.
While Er’s experience sounds like the stuff of legends, strikingly similar accounts have been reported by real people, stretching across cultures and entire eras in human history. From ancient Greece to the present day, people who survive brushes with death often recount a sense of shedding the physical body and entering another realm or dimension. Some describe intense feelings of peace, passing through a dark tunnel toward a bright light, and reexperiencing life events in rich, panoramic detail. Scientists and doctors categorize these events as near-death experiences, or NDEs.
While there is no widely accepted definition of NDEs, the term typically refers to the mystical, profound experiences that people report when they are close to death. They’re most common in patients who survive severe head trauma or cardiac arrest. In other words, “conditions in which you would die, and stay dead, unless somebody instituted emergency medical procedures to help you,” says Bruce Greyson, a psychiatrist at the University of Virginia who has studied NDEs for nearly 50 years.
Such events happen more often than you might think: In the U.S., an estimated 9 million people have reported an NDE, according to a 2011 study in Annals of the New York Academy of Sciences. These individuals — or NDErs — are often deeply changed afterwards. Some find they have a greater gusto for life, more compassion for others and a diminished fear of death. Others struggle to readjust to everyday routine, baffling loved ones with their new beliefs or divorcing their spouses. Even blissful or euphoric NDEs can leave survivors feeling angry or dismayed to be alive again.
In the past 40 years, more and more scientists have probed the phenomenon. Yet despite almost half a century of investigation, researchers still don’t agree on what’s happening during NDEs, or whether they can be explained at all. Some attribute them to hallucinatory flights of imagination, the last gasps of a dying brain. But others are exploring what NDEs may unlock about our understanding of human consciousness — and the possibility that it continues even after our bodies and brains power down.
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It wasn’t until the 18th century that a physician first recorded his own observation — and scientific analysis — of the phenomenon. Around 1740, the first medical report of an NDE came from a military doctor from northern France. Pierre-Jean du Monchaux describes a patient who lost consciousness after having too much blood drawn to treat a fever. The patient later reported that he “saw such a pure and extreme light that he thought he was in Heaven […] and affirmed that never of all his life had he had a nicer moment.” Du Monchaux speculated that too much blood flow to the brain had caused these strong, serene feelings, comparing it to similar reports from people who had survived drowning, hypothermia and hanging.
More than 200 years would pass before research into NDEs really took off. In his 1975 book, Life After Life, psychiatrist Raymond Moody coined the term “near-death experiences” to describe these episodes. The label stuck, as did Moody’s descriptions of the common features reported by survivors, including immense feelings of peace and love, meeting dead loved ones and reaching a barrier or “point of no return.” The research that’s piled up since Moody brought NDEs into the spotlight has largely affirmed this original description.
For much of human history, death was seen as a simple — and permanent — affair. “When people died, whether they had a car accident or were at war or had an infection, the final thing that would occur is that their heart would stop,” says Sam Parnia, director of critical care and resuscitation research at New York University Langone Health medical center. “That was irreversible.”
Since the heart is intimately intertwined with the functioning of the lungs and brain stem, any process that leads one organ to stop working will inevitably lead to the termination of the other two. In short, if any of those three vital organs ceases functioning, death soon follows. Even today, doctors still often declare death at the precise point in time when a patient’s heartbeat comes to a halt.
But in 1960, just 15 years before Moody would popularize the term NDEs, physicians combined mouth-to-mouth breathing with chest compressions to create cardiopulmonary resuscitation. CPR, as we call it today, has made death far less black-and-white. The arrival of CPR, as well as the emergence of intensive-care medicine, enabled people who had passed the threshold of biological death to come back, kept alive through life-support machines, like ventilators.
Parnia thinks that, someday, scientists might be able to push the threshold of death even further. “Actually, the cells inside your body don’t die when you die,” he says. A 2019 discovery showed how brain activity could be restored in pigs more than 10 hours after the animals were killed, a study that Parnia says was worthy of a Nobel Prize. Even when all signs of life have vanished, and brain cells have been deprived of oxygen, those underlying cells don’t die for many hours, and possibly even days. In other words, says Parnia, what we call the “irreversibility” of death is simply a lack of medical means to bring someone back to life.
Advances in medical resuscitation have helped fuel NDE studies, since researchers can now analyze data from large cohorts of cardiac-arrest survivors. For example, in a 2001 study of 344 patients who were successfully resuscitated in Dutch hospitals, 18 percent reported an NDE. More recent studies have even attempted to illuminate what happens to our consciousness when we die, a mystery that’s kept humans awake at night for thousands of years.
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Mind
Can Science Explain Near Death Experiences?
An estimated 9 million people in the U.S. alone have had a transformative near-death experience. Scientists are grappling with what’s happening inside their heads.
By
Alex OrlandoAug 23, 2021 7:00 AM
People who have NDEs are often fundamentally changed by their experience. (Credit: Lumezia/Shutterstock)
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This article appeared in the September/October 2021 issue of Discover magazine as "Death Defying."
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At the end of Plato’s Republic, the philosopher Socrates shares the myth of Er, a warrior who was killed in battle. Twelve days later, the man comes back to life to tell of the other world he had seen. His soul, he says, left his body to arrive in “a mysterious place,” where others were judged for their deeds and luminous beings descended from above.
While Er’s experience sounds like the stuff of legends, strikingly similar accounts have been reported by real people, stretching across cultures and entire eras in human history. From ancient Greece to the present day, people who survive brushes with death often recount a sense of shedding the physical body and entering another realm or dimension. Some describe intense feelings of peace, passing through a dark tunnel toward a bright light, and reexperiencing life events in rich, panoramic detail. Scientists and doctors categorize these events as near-death experiences, or NDEs.
While there is no widely accepted definition of NDEs, the term typically refers to the mystical, profound experiences that people report when they are close to death. They’re most common in patients who survive severe head trauma or cardiac arrest. In other words, “conditions in which you would die, and stay dead, unless somebody instituted emergency medical procedures to help you,” says Bruce Greyson, a psychiatrist at the University of Virginia who has studied NDEs for nearly 50 years.
Such events happen more often than you might think: In the U.S., an estimated 9 million people have reported an NDE, according to a 2011 study in Annals of the New York Academy of Sciences. These individuals — or NDErs — are often deeply changed afterwards. Some find they have a greater gusto for life, more compassion for others and a diminished fear of death. Others struggle to readjust to everyday routine, baffling loved ones with their new beliefs or divorcing their spouses. Even blissful or euphoric NDEs can leave survivors feeling angry or dismayed to be alive again.
In the past 40 years, more and more scientists have probed the phenomenon. Yet despite almost half a century of investigation, researchers still don’t agree on what’s happening during NDEs, or whether they can be explained at all. Some attribute them to hallucinatory flights of imagination, the last gasps of a dying brain. But others are exploring what NDEs may unlock about our understanding of human consciousness — and the possibility that it continues even after our bodies and brains power down.
Bruce Greyson, a psychiatrist at the University of Virginia and author of After: A Doctor Explores What Near-Death Experiences Reveal About Life and Beyond. (Credit: Jen Fariello)
Rethinking Death
What happens to us after we die? The question has lingered over human activity for at least 34,000 years, given records of ancient peoples in Sungir, Russia, burying their dead with ivory beads and other ornamental accessories, which suggests some conception of life beyond the grave. Similarly, reports of NDEs have been referenced by humans wrestling with the possibility of an afterlife since antiquity. They’ve cropped up in the Egyptian Book of the Dead, the Bardo Thödol (or the Tibetan Book of the Dead), the Bible and even the works of Ernest Hemingway.
It wasn’t until the 18th century that a physician first recorded his own observation — and scientific analysis — of the phenomenon. Around 1740, the first medical report of an NDE came from a military doctor from northern France. Pierre-Jean du Monchaux describes a patient who lost consciousness after having too much blood drawn to treat a fever. The patient later reported that he “saw such a pure and extreme light that he thought he was in Heaven […] and affirmed that never of all his life had he had a nicer moment.” Du Monchaux speculated that too much blood flow to the brain had caused these strong, serene feelings, comparing it to similar reports from people who had survived drowning, hypothermia and hanging.
More than 200 years would pass before research into NDEs really took off. In his 1975 book, Life After Life, psychiatrist Raymond Moody coined the term “near-death experiences” to describe these episodes. The label stuck, as did Moody’s descriptions of the common features reported by survivors, including immense feelings of peace and love, meeting dead loved ones and reaching a barrier or “point of no return.” The research that’s piled up since Moody brought NDEs into the spotlight has largely affirmed this original description.
For much of human history, death was seen as a simple — and permanent — affair. “When people died, whether they had a car accident or were at war or had an infection, the final thing that would occur is that their heart would stop,” says Sam Parnia, director of critical care and resuscitation research at New York University Langone Health medical center. “That was irreversible.”
Since the heart is intimately intertwined with the functioning of the lungs and brain stem, any process that leads one organ to stop working will inevitably lead to the termination of the other two. In short, if any of those three vital organs ceases functioning, death soon follows. Even today, doctors still often declare death at the precise point in time when a patient’s heartbeat comes to a halt.
But in 1960, just 15 years before Moody would popularize the term NDEs, physicians combined mouth-to-mouth breathing with chest compressions to create cardiopulmonary resuscitation. CPR, as we call it today, has made death far less black-and-white. The arrival of CPR, as well as the emergence of intensive-care medicine, enabled people who had passed the threshold of biological death to come back, kept alive through life-support machines, like ventilators.
Parnia thinks that, someday, scientists might be able to push the threshold of death even further. “Actually, the cells inside your body don’t die when you die,” he says. A 2019 discovery showed how brain activity could be restored in pigs more than 10 hours after the animals were killed, a study that Parnia says was worthy of a Nobel Prize. Even when all signs of life have vanished, and brain cells have been deprived of oxygen, those underlying cells don’t die for many hours, and possibly even days. In other words, says Parnia, what we call the “irreversibility” of death is simply a lack of medical means to bring someone back to life.
Advances in medical resuscitation have helped fuel NDE studies, since researchers can now analyze data from large cohorts of cardiac-arrest survivors. For example, in a 2001 study of 344 patients who were successfully resuscitated in Dutch hospitals, 18 percent reported an NDE. More recent studies have even attempted to illuminate what happens to our consciousness when we die, a mystery that’s kept humans awake at night for thousands of years.
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Some features of NDEs — like those in John’s case report, detailed in a 2014 paper written by Parnia — seem to defy explanation. Parnia, who also led a four-year study of more than 100 cardiac arrest survivors, notes that some NDErs see scenes from their lives flash before their eyes, a phenomenon researchers call the life review. He also says that most tend to focus on their intentions toward other people. “You end up judging yourself based on your worth as a human being,” Parnia says. “The part that’s particularly inexplicable is they end up experiencing this through the prism of the other person’s perspective.” Beyond that, many of these events depict things that you’d normally be unable to remember, like moments from early childhood.
Another seemingly inexplicable NDE hallmark is the out-of-body experience, or OBE. Many people report that their consciousness seems to float above their body — and, in rare cases, observe and remember what’s happening around them with startling accuracy. In Greyson’s 2021 book, After, the psychiatrist describes how Holly, a patient of his who’d overdosed, was able to recall precise details from his conversation with her roommate (in another room, for that matter) while she was unconscious. Holly even noted the striped tie that Greyson had dribbled spaghetti sauce on. “I was totally flustered by it,” Greyson says. “The only way it could have happened was if she had left her body, and that made no sense to me at all.”
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There’s no denying the transformative power of NDEs. These deeply mystical experiences can prompt major psychological and spiritual changes, like enhanced empathy and less concern for wealth or social status. Beyond that, simply knowing about them can trigger big life changes. Greyson points to research on students who have studied NDEs; even a year after learning about them, they often became more caring and altruistic. “The idea of the near-death experience touches something that we all know deep in our being,” he says. “We are not here alone. We are part of something greater than ourselves.”
Yet not all NDEs are positive. While euphoric NDEs get the most press, other experiences can be deeply disturbing, dominated by feelings of terror, isolation and agony. And while NDEs often precipitate personal growth, they can also trigger symptoms of PTSD and cause major disruptions in people’s lives. “I’ve seen lots of careers end,” says Greyson. “In addition to that, many people were so enraptured by their NDE that they were depressed or angry to be back alive again.”
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Greyson has challenged several of these theories. The REM intrusion theory, he says, is refuted by NDEs that take place under certain conditions that inhibit REM sleep, such as with anesthesia. He also mentions studies that show NDErs have the same, or even higher, oxygen levels as those who have never experienced near-death, addressing the notion that fading cerebral blood flow helps trigger the event. Greyson parsed through many of the supposed explanations in a 2013 paper. “We can go on and on with all of these hypotheses that have been proposed,” he says. “And it sounds plausible. But when you look at the data, it contradicts it.”
Parnia makes even bolder claims regarding his research — namely, that consciousness appears to continue when the brain is shut down completely. He suggests this is possible because thought is a “fundamentally different entity” from the synaptic activity we’ve detected in brain cells. “From a scientific perspective, there’s not a single piece of evidence that demonstrates how brain cells could generate thoughts,” he says. “We [don’t] have the tools yet to measure it. That’s something for future generations of scientists.”
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Researchers like Parnia, however, are continuing to harness rigorous research approaches in their work. In a follow-up study, AWARE II, Parnia and his colleagues are looking at 20 hospitals across the U.S. and Europe, using modern tech like brain oximeters and EEGs to monitor brain functioning during and after cardiac arrest. Whatever these studies show, Parnia says that the empirical science should inform people’s philosophical and spiritual beliefs, not the other way around; as such, these events shouldn’t be treated as hallucinations. He even prefers to avoid the term NDE, because of how it has been used and interpreted. “You have millions of people all over the world who are basically telling you the same thing,” he says. “That means you can use all kinds of research methods to understand what it’s like to experience certain things.”
Greyson echoes Parnia’s belief that NDEs are not hallucinations, pointing to the accuracy of out-of-body reports. But he also acknowledges that we can’t confirm that NDErs have truly brushed against the afterlife. “Those are just subjective experiences,” he adds. With the research tools available today, explaining those experiences, whatever scientists decide to call them, will likely remain an exercise in philosophy just as much as hard science.
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An estimated 9 million people in the U.S. alone have had a transformative near-death experience. Scientists are grappling with what’s happening inside their heads.
www.discovermagazine.com