Have you ever died and come back to life? Me neither. No one has. But plenty of people say that they have, and their experiences were the subject of an episode of Larry King Live last December on which I appeared as the token skeptic among a tableful of believers, including CNN’s medical correspondent Sanjay Gupta, New Age author Deepak Chopra, a football referee who “died” on the playing field, and an 11-year-old boy named James Leininger who believes he is the reincarnation of a World War II fighter pilot.

Dr. Gupta started us off by recalling that when he was in medical school the residents were taught to mark the time of death to the minute, when death can often take anywhere from a couple of minutes to a couple of hours to occur, depending on the conditions. As Gupta noted, people who have fallen into frozen lakes and “died” were not quite dead, and their core body temperatures dropped so rapidly that their vital tissues were preserved long enough for subsequent resuscitation. In other words, people who have near-death experiences (NDEs) are not actually dead!

The same definitional problem arose when guest host Jeff Probst (of Survivor fame, fittingly) introduced the football referee: “A man died on a football field seven years ago and came back to life.” Gupta added that he “was dead for two minutes and 40 seconds.” When I was asked for an explanation, I said: “He wasn’t dead! You started this hour off with Sanjay Gupta explaining we can’t say somebody’s dead at one given moment at a particular time on the clock. That’s not how it works. It takes two, three, five, 10 minutes to go through a dying process. The ref wasn’t dead. He was in a near-death state.” In fact, moments after collapsing, the ref had his heart restarted by an automated external defibrillator. There was nothing miraculous to explain.

Fuzzy language is pervasive in such discussions, and no one uses it better than Dr. Chopra, as in this explanation for NDEs: “There are traditions that say the in-body experience is a socially induced collective hallucination. We do not exist in the body. The body exists in us. We do not exist in the world. The world exists in us.” Here is Deepak on death:

Birth and death are spacetime events in the continuum of life. So the opposite of life is not death. The opposite of death is birth. And the opposite of birth is death. And life is the continuum of birth and death, which goes on and on.

When I asked what had happened to little James Leininger’s soul if his body is now occupied by the soul of a World War II fighter pilot, Chopra offered this jewel of Deepakese: “Imagine that you’re looking at an ocean and you see lots of waves today. And tomorrow you see a fewer number of waves…. What you call a person actually is a pattern of behavior of a universal consciousness.” Indicating our host, he continued,

There is no such thing as Jeff, because what we call Jeff is a constantly transforming consciousness that appears as a certain personality, a certain mind, a certain ego, a certain body. But, you know, we had a different Jeff when you were a teenager. We had a different Jeff when you were a baby. Which one of you is the real Jeff?

Jeff looked as confused as I felt. When Gupta was asked how a physician deals with such apparent medical miracles, he fell into the fallacy of the argument from ignorance:

When I was researching this for a long time, I thought I was going to explain it all away physiologically. But things that I heard and validated and subsequently believed convinced me that there were things that I could not explain. There were things that were happening at that moment, that near-death experience moment, that simply could not be explained with existing scientific knowledge.

So what? The fact that we cannot fully explain a mystery with natural means does not mean it requires a supernatural explanation. It just means that we don’t know everything. Such uncertainty is at the very heart of science and is what makes it such a challenging enterprise.

Five centuries ago demons haunted our world, with incubi and succubi tormenting victims as they lay asleep. Two centuries ago spirits haunted our world, with ghosts and ghouls harassing sufferers during all hours of the night. This past century aliens haunted our world, with grays and greens abducting captives and whisking them away for probing and prodding. Nowadays people are reporting out-of-body experiences, floating above their beds. What is going on here? Are these elusive creatures and mysterious phenomena in our world or in our minds? New evidence adds weight to the notion that they are, in fact, products of the brain. Neuroscientist Michael Persinger, in his laboratory at Laurentian University in Sudbury, Ontario, for example, can induce all these perceptions in subjects by subjecting their temporal lobes to patterns of magnetic fields. (I tried it myself and had a mild out-of-body experience.)

Similarly, the September 19, 2002, issue of Nature reported that neuroscientist Olaf Blanke of Geneva University Hospital in Switzerland and his colleagues were able to bring about out-of-body experiences through electrical stimulation of the right angular gyrus in the temporal lobe of a 43-year old woman suffering from severe epileptic seizures. With initial mild stimulation, she felt she was “sinking into the bed” or “falling from a height.” With more intense stimulation, she said she could “see myself lying in bed, from above, but I only see my legs and lower trunk.” Another trial induced “an instantaneous feeling of ‘lightness’ and ‘floating’ about two meters above the bed, close to the ceiling.”

A related study is cited in the 2001 book Why God Won’t Go Away. In it, Andrew Newberg of the University of Pennsylvania Medical Center and the late Eugene D’Aquili found that when Buddhist monks meditate and Franciscan nuns pray, their brain scans show strikingly low activity in the posterior superior parietal lobe, a region the authors have dubbed the orientation association area (OAA). The OAA provides bearings for the body in physical space; people with damage to this area have a difficult time negotiating their way around a house, for instance. When the OAA is booted up and running smoothly, there is a sharp distinction between self and nonself. When the OAA is in sleep mode — as in deep meditation or prayer — that division breaks down, leading to a blurring of the lines between feeling in body and out of body. Perhaps this is what happens to monks who discern a sense of oneness with the universe, or nuns who feel the presence of God, or alien abductees who believe they are floating out of their beds to the mother ship.

Sometimes trauma can become a trigger. The December 15, 2001, issue of the Lancet published a Dutch study in which 12 percent of 344 cardiac patients resuscitated from clinical death reported near-death experiences, some having a sensation of being out of body, others seeing a light at the end of a tunnel. Some even described speaking to dead relatives. Because the everyday occurrence is of stimuli coming from the outside, when a part of the brain abnormally generates these illusions, another part of the brain interprets them as external events. Hence, the abnormal is thought to be the paranormal.

These studies are only the latest to deliver blows against the belief that mind and spirit are separate from brain and body. In reality, all experience is mediated by the brain. Large brain areas such as the cortex coordinate inputs from smaller brain areas such as the temporal lobes, which themselves collate neural events from still smaller brain modules such as the angular gyrus. Of course, we are not aware of the workings of our own electrochemical systems. What we experience is what philosophers call qualia, or subjective states of thoughts and feelings that arise from a concatenation of neural events.

It is the fate of the paranormal and the supernatural to be subsumed into the normal and the natural. In fact, there is no paranormal or supernatural; there are only the normal and the natural — and mysteries yet to be explained. It is the job of science, not pseudoscience, to solve those puzzles with natural, rather than supernatural, explanations.