By J. Francis Wolfe via Listverse
There is very good reason for all of humanity to have a healthy curiosity relating to near-death experiences. Death is the one experience we are all guaranteed to ultimately share. The field of science has therefore made numerous attempts to explain the near-death phenomena that so many people have independently described.
10 • The Temporoparietal Junction May Be Responsible For Out-Of-Body Experiences
Among the more common elements of near-death experiences is the distinct feeling of an individual having left their worldly body. Those who have had an “out-of-body” experience often report floating above themselves while being able to see their body and the people surrounding them. There have even been a few reports in which those who have had an out-of-body experience can identify objects and events occurring during times in which they were considered clinically dead, but there have also been studies demonstrating that this all could be due to damage in the temporoparietal junction of the brain.
The temporoparietal junction is responsible for assembling the data collected by the body’s senses and organs to form the perception of an individual’s body. When this part of the brain is damaged, it is possible that this results in the “out-of-body” experience that so many people have reported.
Though the experience may appear to be incredibly vivid and real, scientific studies have been able to reproduce this phenomenon without bringing the subject close to death, simply by electrically stimulating the temporoparietal junction of the brain.
9 • Excess Carbon Dioxide May Create The Tunnel And White Light
Nearly every individual who has had a near-death experience discusses the existence of a bright, white light and a tunnel that seems to lead to the afterlife. The white light seems to take on an otherworldly quality and is often accompanied by an overwhelming sense of peacefulness and welcoming.
A 2010 study of patients who had heart attacks revealed that there may be a correlation between this type of near-death experience and the level of CO2 in the blood. Out of the 52 cardiac patients studied, 11 reported a near-death experience. The levels of CO2 in the blood of those 11 patients were significantly higher than the patients who did not report having a near-death experience.
The feeling among researchers is that the excess CO2 in the bloodstream can have a significant effect on vision, which leads to patients seeing the tunnel and the bright light.
8 • Lack Of Oxygen To The Brain Causes Hallucinations
Many near-death experiences include the presence of long-dead friends and relatives appearing and perhaps even guiding the individual as they pass from the world of the living to the afterlife. Memories from every part of life are recalled in rapid succession, and there is an overwhelming sense of comfort, yet it appears that scientific research has provided an explanation for this phenomenon as well.
While excess CO2 has an effect on vision during a near-death experience, a lack of oxygen to the brain also plays a contributing role. It is well known that oxygen deprivation can lead to hallucinations and may even contribute to the feeling of euphoria that is often reported. While the sample size available to researchers is limited, studies have indicated that individuals who reported a near-death experience during cardiac arrest also had lower levels of oxygen.
Researchers believe that oxygen deprivation could well result in people “seeing their lives flash before their eyes” or being transported to a place where they are surrounded by friends and relatives who have long since passed on. This remains just a theory, however, as the other available research seems to indicate that multiple factors contribute to the near-death experience, which include the aforementioned CO2 levels as well. It makes sense in this regard that near-death experiences are commonly reported by those resuscitated following a heart attack, as a heart attack occurs when blood is blocked from reaching the brain.
A man we’ll call Joe recalls plunging into darkness and seeing a bright light. He remembers a field of flowers and a figure in white who spoke to him about his future. The next thing he recalls is awakening to discover that during the time he’d experienced this vision, he’d actually been lying on an operating table with doctors hovering over him, frantically trying to restart his stopped heart.
You’ve probably heard stories similar to this one, which was recounted in a 2006 New Scientist article. What Joe remembers experiencing is called a near-death experience (NDE). Reportedly, about 10 to 20 percent of people who survive heart attacks experience an NDE (source: Callaway). Written accounts of NDEs go back to ancient times. Usually, they involve euphoria, tunnels, bright lights, ethereal beings or some combination of those phenomena. Some people report seeing a high-speed replay of memories — aka, their lives flash before their eyes.
Nobody really knows what NDEs are, or how and why they occur, though there are widely-ranging opinions. Those who believe in the metaphysical think that during an NDE, a seriously ill or injured person’s soul leaves the physical body and journeys to the entrance of the afterlife. There, for whatever reason, he or she is turned away and sent back to resume Earthly life — sometimes with a newfound insight about life’s purpose.
Physicians and neuroscientists who’ve searched for a less mystical explanation for NDEs suspect they’re hallucinations, somehow caused by the process of the dying brain shutting down. Over the years, some have theorized that NDEs result when the brain is deprived of oxygen, or when a mysterious, yet-unverified chemical binds itself to neurons in an effort to protect them from that deprivation. Still others think that the brain’s impending shutdown triggers a flood of euphoria-causing endorphins, or electrical discharges in the hippocampus (the brain area involved in memory), while others think the state is caused by the side effects of anesthesia or medications.
However, so far, science has failed to come up with an airtight explanation for NDEs. In the largest-ever study of the phenomenon, published in the Lancet in 2001, Dutch physicians interviewed 344 mostly elderly hospital patients who survived brushes with death in which their hearts stopped. Only 18 percent of them reported experiencing NDEs, and the researchers found no link to the amount of time they were in cardiac arrest, or the drugs they were given.
Since then, a 2010 study published in the journal Clinical Care offers yet another possible explanation.