Chapter 19

Confirmation Bias and Researcher Bias

A. The Critic’s Argument: NDE Researchers Are Biased

Everyone has biases. That is not a controversial statement. Whether you are a scientist, a pastor, a plumber, or a philosopher, you bring assumptions to the table. You have things you already believe, things you want to be true, and things you would rather not face. The question is not whether bias exists—it does, in every human being who has ever lived—but whether bias has so distorted the evidence that we can no longer trust it.

This is a question that matters in every field of inquiry. It matters in medicine, where pharmaceutical companies fund studies of their own drugs. It matters in law, where prosecutors and defense attorneys each present only the evidence that helps their side. It matters in politics, where voters seek out news sources that confirm their existing views. And it matters in NDE research, where the stakes—the question of whether consciousness survives the death of the body—could hardly be higher.

The critics of near-death experiences think the answer is yes. They believe that the researchers who study NDEs—people like Raymond Moody, Kenneth Ring, Pim van Lommel, Michael Sabom, and Jeffrey Long—are so eager to find evidence for an afterlife that they have let their hopes color their conclusions. The charge is serious. If it sticks, it could undermine the entire body of NDE research. So we need to take it seriously and examine it carefully.

Michael Marsh devotes the whole of Chapter 3 of his Oxford monograph to evaluating how the key NDE authors have interpreted the narrative accounts they collected. He opens with a blunt assessment: he detects “marked bias” in these authors’ work, and he finds it “witnessed in the stylized account of the phenomenology given by Moody.”¹ For Marsh, Moody’s famous composite NDE account—the tunnel, the light, the deceased relatives, the life review, the reluctant return—was never a neutral description of the data. It was an idealized narrative that smoothed over the enormous variation among individual accounts and created a public expectation of what an NDE “should” look like.² Marsh sees this as the original sin of the field: a stylized picture that subsequent researchers and the general public absorbed without question.

Kenneth Ring receives even sharper criticism. Marsh traces Ring’s intellectual trajectory from his early, more careful research at the University of Connecticut to his later works, especially Heading Toward Omega (1985), where Ring argued that NDEs represent an “evolutionary thrust toward higher consciousness for humanity.”³ Marsh is rightly troubled by this. Ring moved from documenting the “core experience” to declaring that NDE experiencers are a new kind of Homo noeticus—a more highly evolved species of human being radiating transcendent awareness.⁴ That is a massive interpretive leap, and Marsh does not let it go unchallenged. He points out that Ring devoted far more space in his early work to parapsychological speculation than to the existing neurophysiological data that was already available to him in 1980.⁵

Marsh also takes aim at Ring’s Religious Beliefs Inventory and his so-called “Universality Index,” arguing that the questionnaire was structured in a way that virtually guaranteed the conclusion Ring wanted: that NDEs push people toward a “universalistically-oriented spirituality” that transcends traditional Christianity.⁶ Marsh’s statistical critique of Ring’s data is detailed and, in places, devastating. He concludes that Ring’s data simply do not warrant the sweeping conclusions drawn from them.⁷

The other NDE authors Marsh evaluates do not escape criticism either. Margot Grey is charged with dismissing conventional neurological explanations in just six pages while devoting twenty-five pages to her own mystical interpretations.⁸ The Fenwicks are described as uncertain and unable to produce solid evidence that consciousness can exist without its underlying brain.⁹ Even Sabom, whom Marsh treats most gently, is noted for his straightforward religious interpretation of NDEs as evidence for a soul that escapes the body at death.¹⁰

Marsh’s overarching point is this: the authors who collected the foundational NDE data were not neutral observers. They came to the evidence with prior commitments—to metaphysics, to parapsychology, to spirituality—and those commitments shaped how they interpreted what they found. According to Marsh, the field of NDE research has been compromised from the start by interpretive bias. The data, in his view, may be interesting, but the conclusions drawn from it are unreliable because the people drawing the conclusions were never truly objective.

John Martin Fischer and Benjamin Mitchell-Yellin, the two philosophers whose work serves as the secondary skeptical text in this book, take the bias argument in a more psychological direction. Their entire Chapter 12 is devoted to confirmation bias (the tendency to seek out and favor information that supports what you already believe, while ignoring or downplaying evidence that contradicts it).¹¹ Fischer and Mitchell-Yellin describe confirmation bias as a deeply rooted human tendency that becomes especially strong when our cherished beliefs are at stake—and they argue that few beliefs could be more cherished than the belief in an afterlife.¹²

They use Eben Alexander’s The Map of Heaven as Exhibit A. They describe it as “one long exercise in confirmation bias”—a book that marshals only evidence in favor of supernaturalism, doubles down with appeals to the emotional benefits of believing, and never seriously examines the arguments against it.¹³ They invoke terror management theory (the idea that much of human behavior is driven by fear of death) to explain why people are drawn to the supernatural interpretation of NDEs. The afterlife is comforting. It gives us hope. And when something is that comforting, we tend to protect it from criticism rather than subjecting it to honest scrutiny.¹⁴

Fischer and Mitchell-Yellin also recount an anecdote about a neighbor of one of the co-authors who, upon learning that they were writing a book on NDEs, interrupted the conversation and declared she would never read their book because she wanted to believe Eben Alexander’s version. They present this as a microcosm of the problem: people do not want to hear arguments against the supernatural interpretation. They want validation.¹⁵

They further note that their Immortality Project, a $5,000,000 grant from the John Templeton Foundation, generated hundreds of personal testimonials from people eager to share their NDEs and have them validated by experts at a research university.¹⁶ Fischer and Mitchell-Yellin suggest that this desire for validation is itself a symptom of confirmation bias at work in the broader NDE community.

Marsh also devotes attention to the way NDE authors handle what he calls “psychical” outcomes. Ring’s claims that NDE experiencers develop enhanced psychic abilities—clairvoyance, telepathy, precognition—are treated with particular skepticism. Marsh notes that Ring’s numeric data on psychic abilities are “scanty and difficult to interpret,” that his studies relied on advertised recruits from IANDS (the International Association for Near-Death Studies) rather than random samples, and that the results were “uncontrolled for the circumstances or nature” of the NDEs themselves.⁵⁸ In Marsh’s view, Ring’s interpretive excesses are not just bad science—they are a symptom of a deeper problem: a prior commitment to a transpersonal worldview that shaped every aspect of his research.

The charge of bias is not limited to the researchers themselves. Fischer and Mitchell-Yellin extend it to the broader NDE community. They invoke the work of Richard Posner, who observes that surrounding yourself with like-minded people is reassuring but “not the best method for arriving at the truth.”⁵⁹ Their argument is that the NDE community—experiencers, researchers, organizations like IANDS, popular authors like Eben Alexander—forms a self-reinforcing echo chamber in which confirming evidence is celebrated and disconfirming evidence is quietly ignored. They cite Francis Bacon’s observation from the seventeenth century that the human understanding, once it has adopted an opinion, “draws all things else to support and agree with it.”⁶⁰

The combined skeptical argument can be summarized simply: NDE researchers wanted to find evidence for an afterlife, so they found it. Their interpretations went beyond the data. Their methods were shaped by their hopes. The NDE community reinforces its own beliefs through a kind of communal confirmation bias. And the people who have NDEs, along with the public that reads about them, are drawn to the supernatural explanation not because the evidence compels it but because the belief is emotionally irresistible.

That is the charge. It is serious, and it deserves a thorough answer. Now let us see how well it holds up.

B. Identifying Weaknesses in the Skeptical Argument

I want to be upfront: some of the skeptics’ criticisms are legitimate. Marsh is right that Moody’s composite account created an idealized picture that obscured the real variation among NDEs. He is right that Kenneth Ring went far beyond his data when he started talking about Homo noeticus and a new world religion. These are real problems, and honest defenders of NDE evidence should acknowledge them without hesitation. I do. Ring’s speculative conclusions in Heading Toward Omega were not warranted by the evidence he collected, and Moody’s famous synthesis, while a powerful tool for public awareness, was never a substitute for careful empirical analysis.¹⁷

But acknowledging those problems is very different from accepting the conclusion the critics want us to draw. The skeptics want us to believe that because some NDE researchers have shown interpretive bias, the entire field is compromised. That is a logical leap, and it does not survive scrutiny. Here is why.

The most glaring problem with the bias argument is that it cuts both ways—and the skeptics seem blissfully unaware that it does. If NDE researchers can be accused of wanting to find evidence for an afterlife, then skeptical researchers can be accused, with equal justice, of wanting to explain NDEs away. Everyone has skin in this game. The materialist has just as much riding on the outcome as the supernaturalist.

Consider Marsh himself. In his Introduction, before he has examined a single case, before he has analyzed a single piece of neurological evidence, he states his thesis plainly: extra-corporeal experiences “are likely to be generated by metabolically disturbed brains especially during the period when they are regaining functional competence.”¹⁸ He further declares that his “overriding premise” is that OBEs and NDEs are brain-state phenomena, and that this is what the entire book “is about and concerned with throughout.”¹⁹ Think about that for a moment. Marsh announces his conclusion before the investigation even begins. His thesis is declared in the opening pages. And then the rest of the book is an attempt to support that thesis.

Now, I do not say this to be unkind. Marsh is a serious scholar. He has a D.Phil. from Oxford. He spent years on this work. But if we are going to apply the standard of “prior commitment” to NDE researchers, we had better apply it consistently. Marsh came to the evidence with a commitment to physicalism. He believed, before examining the data, that a brain-based explanation was the right answer. And that belief shaped how he read every case, every study, every piece of evidence in his book. If Ring’s New Age leanings count as bias, so does Marsh’s materialist commitment.

Fischer and Mitchell-Yellin exhibit the same blind spot. They write eloquently about confirmation bias in NDE believers, but they never turn the mirror on themselves. They never ask: “Might we, as physicalist philosophers, be subject to the same tendency? Might we be selectively interpreting the NDE evidence in a way that protects our own prior commitment to a physical explanation?” That question is never raised in their book. Not once. And its absence is telling.

The anecdote about the neighbor who refused to read their book is illuminating—but not in the way Fischer and Mitchell-Yellin intend. Yes, it shows that some people cling to belief without examining the evidence. But one could easily tell a mirror-image story about physicalist academics who refuse to take NDE evidence seriously because it threatens their worldview. As Bruce Greyson, professor of Psychiatry and Neurobehavioral Sciences at the University of Virginia, has observed with characteristic understatement: if you ignore everything anomalous about NDEs, then it is easy to conclude there is nothing anomalous about them.²⁰

There is also a subtle but important logical problem with the confirmation bias argument as Fischer and Mitchell-Yellin deploy it. Confirmation bias explains why people believe things, but it says nothing about whether what they believe is true. Showing that people have psychological motivations for believing in an afterlife does not show that the afterlife does not exist. This is a textbook genetic fallacy—attacking the origin of a belief rather than the evidence for it. Even if every NDE researcher on earth were hopelessly biased, that would not make the veridical evidence disappear. The patient who accurately described events in another room during cardiac arrest did not stop being accurate just because the researcher who documented the case might have wanted it to be true.²¹

Put it this way. Imagine a detective investigating a murder. The detective’s brother was killed by someone matching the suspect’s description. The detective is biased—he desperately wants to find the killer. Does that bias mean the fingerprint evidence is unreliable? Does it mean the DNA results should be thrown out? Of course not. The evidence is either valid or it is not, regardless of the investigator’s motivations. We can acknowledge the detective’s bias while still evaluating the evidence on its own terms. The same principle applies here. We can acknowledge that Moody wanted NDEs to be real. We can acknowledge that Ring hoped for a transcendent explanation. But the veridical cases stand or fall on their own merits, not on the emotional state of the people who documented them.

Fischer and Mitchell-Yellin also make a curious move that deserves to be called out. They discuss terror management theory—the idea that fear of death drives people to embrace comforting beliefs—as though it only works in one direction. But terror management cuts both ways too. Some people manage their terror of death by believing in an afterlife. Others manage it by refusing to think about death at all, by burying themselves in work, by embracing a materialist philosophy that says death is simply the end and there is nothing to fear because there is nothing to experience. The materialist who insists that consciousness ends at death is not free from death anxiety. He has simply chosen a different strategy for coping with it. And that strategy may be just as much a product of psychological need as the supernaturalist’s hope for heaven.

Finally, the critics treat NDE research as though it is still stuck in the 1970s. Moody’s pioneering work was important, but it was only the beginning. The field has changed enormously since then, and the skeptics’ critique does not adequately reckon with those changes. The most important NDE research being conducted today is not anecdotal, retrospective, or driven by a single researcher’s interpretive framework. It is prospective, controlled, peer-reviewed, and specifically designed to minimize the very biases the critics are worried about.

C. The Pro-NDE Response: Why the Bias Argument Fails

C.1 The Field Has Matured Far Beyond Moody and Ring

The strongest rebuttal to the bias charge is the simplest: the field of NDE research has changed. Dramatically. The early days of Moody and Ring were pioneering but methodologically limited. Both relied on retrospective interviews, often gathered years after the NDE occurred, with no control groups, no standardized protocols, and limited third-party verification. Those limitations were real, and Marsh’s criticisms of the early work are, in many cases, justified.

But to judge the entire field of NDE research by its earliest and weakest work is like judging all of modern medicine by the leeches and bloodletting of the eighteenth century. The field has matured. It has matured enormously. And the research designs now in use are specifically built to address the concerns Marsh raises.

The landmark event was Pim van Lommel’s prospective study, published in The Lancet in 2001—one of the most prestigious medical journals in the world.²² Van Lommel and his team interviewed 344 consecutive cardiac arrest survivors at ten Dutch hospitals. They did not select patients who had reported NDEs. They interviewed all survivors. They used standardized questionnaires. They compared NDE patients with non-NDE patients on medical, psychological, and demographic variables. They followed up at two years and again at eight years to track long-term effects. This was not a researcher going out to find the stories he wanted to hear. This was a rigorously designed prospective study, published after peer review in a top-tier medical journal.

Sam Parnia’s AWARE (AWAreness during REsuscitation) studies followed the same model. They were multi-center, prospective, and specifically designed to test whether patients could perceive visual targets placed outside their physical field of vision during cardiac arrest.²³ The entire point of the AWARE protocol was to create an objective, bias-proof test: either the patient saw the target or they did not. There is no room for interpretive spin when the answer is a simple yes or no.

Penny Sartori conducted a prospective study of intensive care patients in Wales, again interviewing all survivors rather than selectively recruiting NDE experiencers.²⁴ Walter Schwaninger conducted a similar prospective study of cardiac arrest patients in the United States.²⁵ These studies do not rely on a single researcher’s interpretation of anecdotal accounts. They use the tools of modern clinical research: prospective enrollment, control groups, standardized instruments, peer review, and follow-up.

When Marsh criticizes the interpretive bias of Moody and Ring, he is criticizing work from the 1970s and 1980s. He barely engages the prospective studies that have transformed the field since then. That is a significant omission. If you want to discredit NDE research on the grounds of bias, you need to show that the current research is biased—not just that the early work had problems. Marsh does not do that, because the current research is specifically designed to prevent the very problems he identifies.

The difference between early NDE research and the current generation of studies is roughly the difference between a newspaper poll and a double-blind clinical trial. The early researchers asked interesting questions. The current researchers ask those same questions using the tools of modern evidence-based medicine. They enroll patients prospectively (before anyone knows who will have an NDE). They use control groups. They standardize their instruments. They submit their work for peer review. They publish in mainstream medical journals—not in New Age magazines or popular paperbacks, but in The Lancet, Resuscitation, and the Journal of Near-Death Studies.

Sartori’s study is particularly instructive on the bias question. She found that patients who had NDEs with out-of-body components gave significantly more accurate descriptions of their resuscitation procedures than a control group of patients who had been resuscitated but did not report NDEs.⁶¹ The control patients, when asked to guess what happened during their resuscitation, made numerous errors—wrong equipment, wrong procedures, wrong sequences. The NDE patients, by contrast, provided details that matched the medical records. This is the kind of evidence that confirmation bias simply cannot explain. Sartori did not suggest the correct answers to her NDE patients. She did not prompt them. She asked the same questions of both groups and recorded what they said. The accuracy of one group and the inaccuracy of the other is a fact about the world, not a product of the researcher’s wishes.

The broader point is this: the skeptics’ bias argument is aimed at a target that no longer exists. They are fighting the NDE research of the 1970s while ignoring the NDE research of the 2000s and 2020s. It is a bit like someone who refuses to fly because the Wright Brothers’ first airplane looked flimsy. The field has changed. The evidence has gotten stronger. And the methodological safeguards are now robust enough to withstand the bias critique.

C.2 Many NDE Researchers Began as Skeptics

Here is something the critics rarely mention: a remarkable number of the most prominent NDE researchers started out as skeptics. They did not come to the evidence wanting it to be true. They came to it assuming it could be explained in purely physical terms. The evidence changed their minds.

Michael Sabom is the clearest example. Sabom was a cardiologist who attended a seminar on Moody’s Life After Life in the late 1970s. He was the only physician in the room, and he was asked for his professional opinion. His response was candid: he was highly skeptical. NDEs sounded like exactly the kind of anecdotal nonsense that a rigorous medical scientist should dismiss.²⁶ But instead of walking away, Sabom did something unusual. He began interviewing his own cardiac arrest patients. He set up a careful study with a control group. And what he found surprised him. The patients who reported out-of-body experiences during cardiac arrest gave descriptions of their resuscitation procedures that were significantly more accurate than the guesses of a control group of cardiac patients who had not had NDEs.²⁷ Sabom did not come to the data wanting to find evidence for the soul. He came skeptical and was persuaded by what he found.

Pim van Lommel tells a similar story. He began his career as a conventional cardiologist with standard materialist assumptions. He had no particular interest in NDEs and no prior commitment to any metaphysical position. But when his patients started reporting detailed, coherent experiences during periods of cardiac arrest—when their brains should have been incapable of producing any conscious experience at all—he could not ignore it. His decades of subsequent research grew out of his attempt to understand something that his medical training told him should not be possible.²⁸

Jeffrey Long, a radiation oncologist, followed a similar path. He began as a scientifically trained physician with no particular interest in NDEs. His encounter with a medical journal article about NDEs sparked his curiosity, and his subsequent founding of the Near-Death Experience Research Foundation (NDERF) grew from a desire to collect and analyze NDE accounts with scientific rigor, not from a prior commitment to supernaturalism.²⁹

Even Bruce Greyson, one of the most respected names in the field, began his career as a psychiatrist with standard physicalist assumptions. He has spoken openly about how his encounter with NDE patients gradually convinced him that the standard materialist framework was inadequate to explain what he was seeing in his clinical practice.³⁰

This pattern matters. If the bias argument is that NDE researchers are people who wanted to believe in an afterlife and then went looking for evidence, these cases blow that narrative apart. Sabom did not want to believe. Van Lommel did not want to believe. Long did not want to believe. They were converted by the evidence, not by their wishes. And if skeptics can be converted by evidence, that is actually a mark in favor of the evidence, not against it.

I want to press this point a bit further, because it is often glossed over too quickly. When a committed materialist encounters evidence that challenges his worldview and changes his mind, that is not a sign of bias. It is a sign of intellectual honesty. It is exactly what good science looks like. Sabom had every reason to dismiss the NDE accounts he heard. He was a cardiologist, trained in a materialist medical paradigm, working in a system that had no place for disembodied consciousness. Accepting the evidence meant revising deeply held professional assumptions. It meant risking his reputation among peers who would consider his conclusions eccentric at best and embarrassing at worst. The social and professional incentives all pushed in the direction of skepticism. He followed the evidence anyway.

Van Lommel faced the same headwinds. A cardiologist in the Netherlands who publishes a prospective study in The Lancet suggesting that consciousness may continue during cardiac arrest is not making a career-enhancing move. He is painting a target on his back. The fact that he did it anyway, and that the study survived peer review at one of the world’s most rigorous medical journals, suggests that the evidence was strong enough to overcome the considerable professional risks. You do not stake your medical career on wishful thinking.

The skeptics, by contrast, have generally not undergone any comparable conversion. Marsh began as a materialist and remained one. Fischer and Mitchell-Yellin began as physicalist philosophers and remained physicalists. Susan Blackmore began as a materialist and remained one. Gerald Woerlee is a lifelong materialist. There is nothing wrong with that, of course—remaining consistent with your prior views is not, by itself, a sign of bias. But it does undermine the claim that the pro-NDE researchers are uniquely biased. If anything, the researchers who changed their minds in response to evidence are demonstrating less bias than the ones who never changed their minds at all.

C.3 Veridical Cases Provide an Objective Check on Bias

There is something else the critics consistently underplay, and it is perhaps the most important point in this chapter: veridical NDE cases provide an objective, bias-resistant check on the data. Either the patient’s report matches reality or it does not. No amount of researcher bias can make a false report come true. No amount of wishful thinking can cause a patient to correctly identify a nurse who removed his dentures during cardiac arrest, or to accurately describe surgical instruments she had never seen before, or to report a conversation that took place in a different room while she was clinically dead. These are facts about the external world. They are checkable. They are falsifiable. And that makes them the ultimate antidote to the bias objection.

When a cardiac arrest patient reports seeing a nurse place his dentures in a specific drawer of a specific cart during resuscitation—and that report is later confirmed by the nurse in question—no one’s bias made that happen.³¹ When a patient under general anesthesia during hypothermic cardiac arrest describes the surgical instruments used on her with startling accuracy—including a bone saw that looked “like an electric toothbrush” with interchangeable blades stored in a “socket wrench case”—the researcher’s prior beliefs did not create that correspondence.³² When a child recovering from cardiac arrest immediately tells a nurse about specific events that occurred in the operating room during the period of clinical death, the researcher’s interpretive framework is irrelevant to whether the child’s account is accurate.³³

This is the fatal flaw in the bias argument. The critics treat NDE research as though it consists entirely of subjective interpretations of subjective reports. But it does not. A significant and growing portion of NDE research involves veridical perception—cases where the patient’s report contains specific, verifiable details that can be checked against reality. And when Janice Holden, in her comprehensive 2009 analysis, searched for every case of apparently veridical perception during an NDE reported since 1975, she found 107 such cases from thirty-nine publications by thirty-seven different authors or author teams. Using the strictest possible criterion—classifying any case with even one inaccurate detail as “inaccurate”—she found that only 8 percent contained any error at all. Meanwhile, 37 percent were confirmed as completely accurate by independent, objective verification.³⁴

Think about what that means. If NDEs were hallucinations shaped by researcher bias and patient expectation, the veridical hit rate should be no better than chance. You would expect a roughly random distribution of accurate and inaccurate claims. Instead, you get a 92 percent accuracy rate. No amount of confirmation bias can manufacture a 92 percent accuracy rate in veridical perception reports. The evidence is either accurate or it is not. Bias cannot make it accurate.

Rivas, Dirven, and Smit, in their exhaustive The Self Does Not Die, catalogue over one hundred cases of veridical or otherwise paranormal perception during NDEs, with detailed documentation, third-party confirmation, and careful analysis of alternative explanations.³⁵ Each case is individually documented. Each case includes the verification method and the source of confirmation. These are not anecdotes plucked from an enthusiast’s website. They are carefully researched, independently verified, and published in a scholarly format.

Chris Carter, in Science and the Near-Death Experience, makes the point well: Susan Blackmore, one of the most prominent NDE skeptics, once conceded that her suspicion was “that there may be no properly corroborated cases that cannot be accounted for by the perfectly normal processes of imagination, memory, chance and the use of the remaining senses.” Carter notes that Blackmore’s comments may have been justified at the time they were written, but that researchers subsequently gathered impressive corroborated accounts precisely because Blackmore’s critique served as a wake-up call.³⁶ The field responded to the criticism. It got better. It got more rigorous. And the evidence got stronger, not weaker.

C.4 Skeptical Bias: The Elephant in the Room

The critics focus relentlessly on bias among NDE researchers. But there is another kind of bias that gets almost no attention in the skeptical literature: the bias of materialist researchers who are committed, on philosophical grounds, to explaining NDEs in physical terms regardless of where the evidence points.

The authors of The Self Does Not Die describe this phenomenon vividly in their account of Gerald Woerlee, a Dutch-Australian anesthesiologist who has devoted enormous energy to debunking NDE evidence. Woerlee is described as “a passionate materialist who fosters a remarkably militant atheism along with the outspoken wish that the whole world would be converted to the rational humanism that forms the basis of hard materialism.”³⁷ His sole aim, in the assessment of Rivas, Dirven, and Smit, has been to reduce NDEs to nothing but chemical processes in a dying brain. He even claims that his website is the only truly reliable source of information about NDEs—a claim that, by itself, should raise red flags about objectivity.³⁸

J. Steve Miller, in his careful analysis of the NDE literature, identifies a similar dynamic in Kevin Nelson’s work. Nelson, a neurologist, wrote The Spiritual Doorway in the Brain, in which he argued that NDEs are caused by REM intrusion (a phenomenon where elements of the dreaming state leak into waking consciousness). But Miller notes that Nelson appeared to have begun his research with his conclusion already firmly in place. Upon encountering his first NDE patient as a medical intern, Nelson reportedly knew immediately that the brain was responsible for the experience—before he had studied the phenomenon at all.³⁹ Nelson never seemed to seriously consider that the patient might have experienced something outside his body. His entire research program was built on the assumption that a naturalistic explanation must exist.

Miller draws on Thomas Kuhn’s landmark work The Structure of Scientific Revolutions to make a broader point: scientists often resist evidence that supports rival theories, even when the evidence mounts to a point that should be compelling. Paradigms are powerful. They shape what scientists see, what they look for, what they consider possible, and what they dismiss without investigation.⁴⁰ The materialist paradigm is no exception. A researcher who believes, as a matter of philosophical commitment, that consciousness is entirely produced by the brain, will naturally resist evidence suggesting that consciousness can function independently of the brain. And that resistance is just as much a form of bias as any NDE researcher’s hope for an afterlife.

Miller’s analysis of Nelson’s research reveals some telling details. Nelson claimed in his prologue that his team had collected “one of the largest numbers of research subjects with near-death experiences ever compiled.” The actual number? Fifty-five subjects, all recruited from Jeffrey Long’s NDERF website.⁶² Compare that to Long’s own database of over three thousand NDE accounts, or Fenwick’s study of three hundred, or Ring’s study of one hundred and two. Fifty-five subjects is a modest sample by any standard, yet Nelson presented it with the kind of fanfare usually reserved for groundbreaking discoveries. Furthermore, Nelson’s study was retrospective, not prospective. It did not include the kind of controlled, clinical methodology that would be needed to establish a causal link between REM intrusion and NDEs. And his dismissive attitude toward researchers who disagreed with him—including Moody, Sabom, and van Lommel—suggested a combative rather than open-minded approach to the evidence.⁶³

None of this means that Nelson is dishonest or that his research has no value. It means he is human. He brought assumptions to his work, just as every researcher does. But the point stands: if we are going to scrutinize the biases of NDE researchers who lean toward supernaturalism, intellectual honesty demands that we scrutinize the biases of NDE researchers who lean toward materialism with exactly the same rigor.

Consider this revealing fact: Mobbs and Watt published a paper in 2011 with the provocative title suggesting that the neuroscience of NDEs was enough to explain them completely. But as Greyson pointed out, their paper never even acknowledged the veridical evidence—the very data that is hardest for materialist models to explain.⁴¹ And when co-author Watt was pressed, she admitted that the bold title was requested by the editor to provoke a reaction, and that she herself considered it “an overstatement.”⁴² The article went worldwide, assuring people that science had finally explained NDEs—yet it had never dealt with the most relevant evidence. If that is not confirmation bias in action, I am not sure what would count.

We could multiply examples. The authors of The Self Does Not Die describe the puzzling behavior of Sam Parnia himself, who for years was an outspoken advocate for the evidential significance of NDEs but whose later public statements on social media seemed to take a more materialist tone. Rivas, Dirven, and Smit note that Parnia’s “Parnia Lab” social media accounts began favoring a neurological approach to NDEs, making no mention of the anomalous perceptions that could not be explained by residual brain processes.⁶⁴ Whether this represents a genuine shift in Parnia’s views, an attempt to maintain academic respectability in a field hostile to dualism, or something else entirely is unclear. But it illustrates a point that the bias critics rarely acknowledge: the professional and social pressures in the academy overwhelmingly favor physicalism. A researcher who publishes evidence for consciousness surviving death risks mockery, marginalization, and career damage. The bias, in the institutional sense, runs against the pro-NDE position, not in favor of it.

C.5 Distinguishing Interpretation from Evidence

One of the most important distinctions in the entire NDE debate—and one the critics often blur—is the distinction between the evidence collected by NDE researchers and the interpretations those researchers place on it. These are two very different things, and conflating them is a serious intellectual error.

I can agree with Marsh that Kenneth Ring’s speculations about Homo noeticus and a new world religion went far beyond the evidence. I can agree that Moody’s composite account was an oversimplification. I can agree that some NDE researchers have drawn theological or metaphysical conclusions that are not warranted by the data alone. And yet none of that affects the underlying evidence. The cases are still there. The veridical reports are still there. The medical records, the third-party confirmations, the prospective studies—they are all still there, untouched by the interpretive excesses of any individual researcher.

As J. Steve Miller explains in his analysis of Ring’s work, Michael Sabom was so concerned about Ring’s speculative conclusions that he conducted his own study of a more random sampling of NDE experiencers to test whether Ring’s claims held up. They did not. Sabom found no net increase in belief in reincarnation among his subjects, no drift toward Eastern religion, and no decline in church attendance. He concluded that belief in reincarnation and universalist religion was not a direct aftereffect of the NDE itself.⁴³ In other words, the self-correcting mechanisms of science worked. Ring overstated his case. Sabom challenged him. The data won.

To his credit, Miller also notes that Ring himself was quite tentative in Heading Toward Omega, admitting upfront that his conclusions were not based on a random sample and cautioning readers that his data should be regarded with “extreme tentativeness.”⁴⁴ This is an important detail that Marsh and Fischer tend to omit. Ring overreached, yes. But he was more aware of his limitations than the critics give him credit for.

The crucial point is this: even if every interpretive claim made by every NDE researcher were thrown out, the raw evidence would remain. The dentures man still described the nurse and the cart. Pam Reynolds still described the bone saw and the conversations during her surgery. The children still reported events during their cardiac arrests. The prospective studies still show that a substantial minority of cardiac arrest survivors report NDEs with features that no current neuroscientific model can explain. You can criticize how researchers interpret that evidence all day long. But you cannot make the evidence itself go away by pointing at the interpreter.

And there is something else worth noting here: the NDE research community has demonstrated the self-correcting capacity that is the hallmark of good science. When Ring overreached, Sabom challenged him—and the data supported Sabom. When Moody’s composite account was criticized as misleading, later researchers abandoned it in favor of standardized instruments like Greyson’s NDE Scale. When Blackmore challenged the field to produce properly corroborated veridical cases, researchers responded by gathering them—and Holden’s 2009 analysis documented over a hundred. When critics demanded prospective studies, van Lommel, Parnia, Sartori, and Schwaninger delivered them. The field has not ignored its critics. It has responded to them, and it has gotten better because of them. That is exactly what a healthy, evidence-driven research program looks like. Fields that are driven purely by bias do not improve in response to criticism. They dig in and dismiss the critics. The NDE research community has done the opposite.

C.6 The Templeton Foundation Objection Backfires

Fischer and Mitchell-Yellin’s discussion of the Templeton Foundation Immortality Project deserves special attention, because it actually undercuts their own argument more than it supports it. They describe being inundated with testimonials from NDE experiencers eager to share their stories. They interpret this as evidence of confirmation bias: people wanted validation, so they sought it from authoritative academics.

But consider the other side. Fischer and Mitchell-Yellin received a $5,000,000 grant to study immortality—and they used it to write a book arguing against the supernatural interpretation of NDEs. Think about what kind of prior commitment that reveals. They came to the project as physicalist philosophers. Their book presents the physicalist position. And the Templeton Foundation, for all its reputation as an organization friendly to religious inquiry, funded a project that produced an explicitly anti-supernatural book. If anything, this suggests that the academic establishment is at least as biased toward physicalism as the NDE community is toward supernaturalism. The academy has its own confirmation biases, its own incentive structures, and its own ways of protecting its preferred paradigm.⁴⁵

The real question, once again, is not who has biases. The real question is: where does the evidence point when we set the biases aside as much as humanly possible? And the answer, as we have shown throughout this book, is that the evidence points powerfully toward the reality of consciousness functioning apart from the body.

C.7 A Word About Bias and the Christian Critic

Before leaving this topic, I want to address one more dimension of the bias issue that is particularly relevant for Christian readers. Raymond Lawrence, in Blinded by the Light, and Hank Hanegraaff have both raised the concern that NDE researchers are biased against biblical Christianity.⁴⁶ Lawrence documents cases where NDE experiencers interpret their experiences through a framework that diverges significantly from orthodox Christian teaching—embracing universalism, rejecting traditional doctrines of judgment, or synthesizing NDE revelations with New Age spirituality.

This is a legitimate concern, and I share it to some degree. Some NDE experiencers and some NDE researchers have made claims that are not compatible with biblical Christianity. Ring’s vision of a new world religion is one example. George Ritchie’s claim that his NDE gave him knowledge that superseded biblical truths is another.⁴⁷

But here is the critical distinction: the interpretations that experiencers and researchers place on NDEs must be carefully distinguished from the evidence the NDEs provide. An NDE experiencer who concludes from his experience that all religions are equally valid has made an interpretive claim that goes far beyond what the experience itself demonstrates. The experience may demonstrate that consciousness continues after clinical death. It may demonstrate that the dying person encounters a loving presence, meets deceased relatives, and undergoes a life review. Those are the evidential elements. The claim that all religions are equally valid is a theological interpretation layered on top of the experience—and it is an interpretation that should be evaluated on its own merits, against the full testimony of Scripture.⁴⁸

As Miller demonstrates in his thorough analysis, the NDE data itself does not teach reincarnation, does not teach that everyone goes to heaven, and does not contain specific doctrines from Eastern religions that contradict Christian teaching. When researchers found that some NDE experiencers embraced such beliefs, further investigation revealed that these beliefs were more often absorbed from the NDE community’s support groups and literature than from the experiences themselves. Sabom’s more careful study found no net shift toward these positions in a random sample of NDErs.⁴⁹

In fact, Miller’s work reveals something that both secular skeptics and Christian critics often miss: the surprising presence of Jesus in many NDEs, the scarcity of explicitly anti-Christian elements in the core NDE features, and the broad compatibility of NDE evidence with historic Christian teachings about the intermediate state, the reality of the soul, and the existence of a realm beyond the physical.⁵⁰ We will explore this in more detail in Chapters 27 and 28, but the point here is that the bias argument against NDE research, when applied by Christian critics, needs the same careful nuance as when it is applied by secular ones. Do not throw out the evidence because some people have interpreted it badly.

D. Counter-Objections and Conclusion

D.1 “But the researchers who started as skeptics may have been converted by their own desire for meaning, not by the evidence.”

A determined critic might respond that even Sabom, van Lommel, and Long, despite beginning as skeptics, may have been gradually seduced by the emotional power of the stories they heard. Surrounded by patients telling moving accounts of tunnels and lights and deceased loved ones, the argument goes, these physicians may have experienced a kind of slow-motion conversion driven by empathy and wonder rather than by hard evidence.

This objection is understandable. Working with dying patients is emotionally intense. Hearing vivid descriptions of otherworldly encounters day after day could, in theory, erode a skeptic’s defenses over time. The emotional pull of these stories is real, and no honest person would deny it. I certainly would not.

But this objection fails for three reasons. First, it proves too much. If exposure to moving stories is enough to compromise a trained scientist’s objectivity, then all clinical research involving patient reports is suspect—not just NDE research. Oncologists who study quality-of-life outcomes, psychiatrists who research trauma narratives, pediatricians who document child abuse—all of them hear emotionally powerful stories every day. We do not throw out their research on the grounds that they might have been emotionally moved by their patients. We evaluate the research on its merits. The same standard should apply to NDE research.

Second, the objection assumes that emotion and evidence are mutually exclusive. They are not. A cardiologist can be deeply moved by a patient’s NDE account and evaluate it with scientific rigor. The two are not in conflict. In fact, it is precisely the emotional impact of certain NDE cases—cases with verified details, corroborated reports, and baffling accuracy—that drives researchers to investigate further. Being emotionally engaged is not the same as being biased. It is a motivation, not a methodology.

Third, and most importantly, the skeptics-turned-advocates were not converted by stories alone. They were converted by data. Sabom was converted by the statistically significant difference in accuracy between his NDE patients’ accounts and the guesses of his control group.⁵¹ Van Lommel was converted by the results of a prospective study published in The Lancet—the kind of rigorous, controlled research that Marsh himself says is needed.⁵² Long was converted by the patterns he found in thousands of NDE accounts analyzed with consistent methodology.⁵³ You can dismiss a story. You can dismiss an anecdote. You cannot so easily dismiss a peer-reviewed prospective study in one of the world’s leading medical journals.

Sabom’s study is worth a closer look here. He did not just interview NDE patients and accept their stories at face value. He set up a controlled comparison. He asked cardiac arrest patients who reported NDEs to describe what happened during their resuscitation. Then he asked a control group of cardiac patients who had not had NDEs to describe what they thought a typical resuscitation looked like. The control group, despite being familiar with medical settings, made significant errors. They described procedures that were not used, equipment that was not present, and sequences that did not match reality. The NDE patients, by contrast, provided descriptions that matched the medical records with remarkable precision.⁶⁵ This is not a researcher interpreting stories in a favorable light. This is controlled, comparative data. The NDE patients knew things they should not have known. No amount of emotional seduction explains that.

D.2 “Even if bias cuts both ways, it still undermines confidence in the pro-NDE case.”

A more sophisticated critic might concede that bias exists on both sides but argue that this should make us agnostic rather than confident. If NDE researchers are biased toward supernaturalism and skeptics are biased toward physicalism, then maybe we just cannot trust anyone, and the question remains unresolved. Perhaps the whole endeavor is hopelessly compromised, and we should simply suspend judgment indefinitely.

This sounds reasonable, but it misses a crucial point. When biases cancel each other out, the evidence itself becomes the deciding factor. And the evidence, as we have documented throughout this book, favors the pro-NDE position. The veridical cases are real. The prospective studies are peer-reviewed. The accuracy rates are far above chance. The neurological explanations fail to account for the full range of NDE features. The veridical elements cannot be explained by confirmation bias, cultural conditioning, or wishful thinking. If both sides are biased, then we must look at the evidence with fresh eyes—and when we do, the evidence points in one direction.

If we strip away all the interpretive baggage—Ring’s Homo noeticus, Marsh’s materialism, Fischer’s Templeton Project, Alexander’s bestsellers—and just look at the evidence on its own terms, we find a consistent, cross-cultural, multiply-verified body of data showing that people who are clinically dead sometimes report accurate perceptions of events they could not have perceived by any known physical mechanism. That evidence does not depend on anyone’s bias. It depends on whether the patient’s report matches reality. And in case after documented case, it does.⁵⁴

D.3 “But the prospective studies have not yet produced the definitive experiment.”

A final counter-objection is that the prospective studies, while more rigorous than the early retrospective work, have not yet produced the definitive experiment that would settle the question. The AWARE studies, for example, placed visual targets near the ceilings of resuscitation rooms, but no patient with a confirmed NDE has yet been resuscitated in a location where the target was visible from the OBE perspective.⁵⁵ Does this not count against the NDE hypothesis?

Not really. The absence of a positive target hit in the AWARE studies is disappointing but not evidentially decisive. The practical challenges of this kind of research are enormous: cardiac arrests happen unpredictably, patients must be resuscitated in rooms where targets are properly placed, the patient must have an NDE with an OBE component, and the OBE must occur in a position where the target is visible. The odds of all these factors aligning are small, and the small number of cases that met all the criteria is a logistical limitation, not an evidential refutation.

Moreover—and this is critical—the AWARE studies did produce veridical cases that do not depend on the targets. In the first AWARE study, one patient provided a detailed and verified account of his resuscitation that could not be explained by residual consciousness, including specific events confirmed by the medical staff present.⁵⁶ The target experiment is a useful additional test, but the absence of a target hit does not erase the positive veridical evidence that has been documented.

And let us note: the AWARE II study’s final publication in 2023 confirmed that none of the patients who reported NDEs had interpretable EEG data. As the AwareofAware blog noted, it is therefore “entirely false to say there is an association of brain activity with NDEs” in that study.⁵⁷ The very study that skeptics hoped would explain NDEs as brain activity ended up providing zero evidence for that claim.

Conclusion

The bias argument is one of the most emotionally satisfying weapons in the skeptic’s arsenal. It feels like a trump card. If you can show that the researchers are biased, you can dismiss the evidence without having to engage it. But it does not work that way. Bias is universal. It affects skeptics and believers alike. The question is not who has biases but whose interpretation best fits the totality of the evidence.

Marsh’s critique of the early NDE literature has merit. Ring overreached. Moody oversimplified. Some NDE researchers have drawn conclusions that go beyond what the data supports. But the field has matured far beyond those early limitations. The prospective studies of van Lommel, Parnia, Sartori, and Schwaninger are specifically designed to control for bias. The veridical cases provide an objective check that no amount of researcher bias can manufacture. And the remarkable number of skeptics-turned-researchers—Sabom, van Lommel, Long, Greyson—powerfully undermines the claim that the field is driven by wishful thinking rather than evidence.

Fischer and Mitchell-Yellin’s discussion of confirmation bias is philosophically interesting but ultimately self-undermining. They describe with great clarity the ways in which human beings protect their cherished beliefs from disconfirming evidence. But they never apply this analysis to their own position. They never ask whether materialist academics might be just as subject to confirmation bias as afterlife believers. They never consider that the professional rewards of the academy overwhelmingly favor physicalist conclusions, creating a powerful institutional bias that runs in the opposite direction from the one they describe. Their analysis is one-eyed. It sees the speck in the supernaturalist’s eye but misses the beam in the materialist’s.

For Christian readers, the lesson is nuanced but important. Yes, some NDE researchers have interpreted their findings in ways that conflict with biblical Christianity. Ring’s New Age conclusions are a genuine concern. But the evidence itself—the veridical cases, the prospective studies, the data on consciousness during cardiac arrest—is not in conflict with the Christian faith. It supports the biblical teaching that we are more than our bodies, that the soul is real, and that consciousness continues after physical death. The interpretive excesses of some researchers should not drive us to reject the evidence they have uncovered. We must learn to separate the wheat from the chaff.

The bias argument, in the end, is a distraction. It asks us to focus on the researchers rather than the research. It asks us to question the investigators rather than investigating the evidence. It is, at bottom, an attempt to change the subject—to talk about the people instead of the data they collected. And when we do investigate the evidence—the cases, the studies, the data—we find something that bias alone cannot explain: a consistent, cross-cultural, multiply-verified body of evidence that consciousness sometimes functions when the brain does not.

That evidence does not go away because someone accuses the people who collected it of wanting it to be true. It stands or falls on its own. And it stands.