The phenomenon of near-death experiences (NDEs) continues to captivate and challenge scientists,with new research emerging as individuals share remarkably consistent accounts of events occurring during moments of extreme physical distress. A recent report from the University of Virginia highlights the complexities of studying NDEs-experiences ofen described as profoundly real and deeply impactful, yet difficult to explain through conventional medical understanding [3]. Researchers are grappling with whether these experiences represent a final surge of brain activity, a psychological response to trauma, or something altogether different.
Illustration of a near-death experience (Photo: Earth)
Researchers continue to investigate the complex phenomenon of near-death experiences (NDEs), which occur during moments of critical illness or trauma. Understanding these experiences is important as they can have a profound impact on individuals and their families.
Near-death experiences, or sakaratul maut as they are known in some cultures, are often reported by people who have survived events like cardiac arrest, severe accidents, or significant loss of consciousness. Despite being on the brink of death, many individuals describe remarkably vivid and emotionally powerful mental experiences.
Those who have undergone an NDE frequently report a sense of clarity, profound peace, and detailed recollections of what they perceived during the event.
Many describe the experience as feeling more real than everyday life, prompting scientists to seek a scientific explanation for what happens in the brain during these critical moments.
According to a report from Earth on January 19, researchers at the University of Virginia (UVA) acknowledge that many fundamental questions about NDEs remain unanswered by current scientific understanding.
While numerous theories have been proposed, none fully and consistently explain all aspects of the experience.
Generally, NDEs encompass a range of experiences, including feelings of serenity, sensations of leaving the body, traveling through a tunnel of light, and encounters with deceased loved ones.
What makes this phenomenon particularly compelling is the strength and longevity of the memories reported by survivors. Many retain remarkably clear recollections of their experiences decades later.
Drs. Bruce Greyson and Marieta Pehlivanova, leading researchers at UVA School of Medicine, suggest that the intensity of these memories and the emotional impact of NDEs don’t align with conventional neurological explanations.
They highlight a newer neuroscience model called NEPTUNE, which attempts to explain NDEs through changes in brain activity, neurochemicals, and evolutionary factors.
The NEPTUNE model proposes that fluctuations in oxygen, carbon dioxide, or brain chemistry could trigger near-death experiences. However, Greyson and Pehlivanova point out that many studies have actually found normal, or even elevated, oxygen levels in some patients who report NDEs, directly challenging a core assumption of the model.
While carbon dioxide changes can potentially explain stronger memory recall, they don’t account for the initial onset of the experience. Greyson believes NEPTUNE tends to overlook conflicting scientific evidence and fails to address the most significant aspects of NDEs.
The model often categorizes NDEs as a form of hallucination. However, researchers argue this comparison isn’t entirely accurate. Medical hallucinations typically involve only one sense, such as sight or sound. Conversely, NDEs often encompass vision, sound, touch, and emotion simultaneously.
Furthermore, hallucinations generally fade quickly, while NDE memories are remarkably persistent and often lead to significant life changes. Many survivors report reduced fear of death, increased empathy, and a renewed sense of purpose. These patterns of change are uncommon in typical hallucinations.
One of the most debated aspects of NDEs is the out-of-body experience, where individuals feel their consciousness separates from their physical body and can observe events from an external perspective. NEPTUNE links this to activity in the temporoparietal junction area of the brain.
However, Greyson and Pehlivanova explain that brain stimulation experiments in laboratories don’t replicate genuine NDE reports. While subjects may experience unusual sensations, they don’t genuinely feel their consciousness leaving their body. Visual perception remains limited, and there’s no perception from an external viewpoint.
Researchers emphasize that there’s no evidence that electrical stimulation of the brain can create an accurate perception of something not visible to the physical eye, or an experience that remains clear even with eyes closed. This contrasts sharply with spontaneous NDE reports that often describe events accurately.
NEPTUNE also draws comparisons between NDEs and experiences induced by substances like ketamine or DMT. While some surface-level similarities exist, fundamental differences are significant. Drug-induced experiences tend to be fragmented and short-lived, whereas NDEs are characterized by high clarity, deep emotional meaning, and long-term memory.
Even Karl Jansen, a ketamine researcher, later stated that the drug doesn’t create NDEs, but rather opens access to states of consciousness that may resemble some aspects of them. This reinforces the idea that near-death experiences possess a unique character that’s difficult to equate with drug effects.
Recent studies have also reported surges of electrical activity in the brain moments before death. NEPTUNE suggests this surge might support consciousness. However, Greyson and Pehlivanova point out that many patients in these studies still had cardiac activity and didn’t show signs of conscious awareness.
In cases of cardiac arrest, the brainwave patterns associated with consciousness don’t align with reports of near-death experiences. To date, no clear link has been established between these brain electrical surges and the occurrence of NDEs.
Adding to the challenge of scientific explanation are reports of NDEs that include accurate details about events occurring around the patient while they were in a state of complete unconsciousness. Verified accounts suggest the experience occurred when brain function shouldn’t have been capable of supporting awareness.
Greyson asserts that NDEs are triggered by physiological events, making it reasonable for scientists to seek cause-and-effect relationships. However, he also stresses that research in this field is still in its early stages and requires an open mind to avoid getting fixated on a single theory.
Currently, near-death experiences remain a significant enigma in science. The phenomenon appears to exist at the intersection of biology, psychology, and human consciousness. Each new discovery raises more questions than answers.
The study was published in the journal Psychology of Consciousness: Theory, Research, and Practice, serving as a reminder that human understanding of consciousness remains limited. The mystery of NDEs highlights that many aspects of the mind and life remain beyond the full grasp of modern science.
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pengalaman mendekati kematian misteri kesadaran manusia penelitian near death sakaratul maut
