Near-death experiences

 
Near-death experiences
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In 2008, a large-scale study, called AWARE (AWAreness during REsuscitation), examined the broad range of mental experiences in relation to death. The researchers considered 2,060 cardiac arrest cases across 15 hospitals worldwide.

Researchers report that there’s a unique experience of death that seems far broader than what’s called a “near-death experience.”

Recollections in relation to death, so-called out-of-body experiences (OBEs), or near-death experiences (NDEs), are often considered hallucinatory or illusory, and objective studies on these experiences are limited.

Researchers also tested the validity of conscious experiences using objective markers for the first time in a large study. They wanted to determine whether claims of awareness compatible with out-of-body experiences correspond with real or hallucinatory events.

“Contrary to perception, death is not a specific moment but a potentially reversible process that occurs after any severe illness or accident causes the heart, lungs, and brain to cease functioning,” says Sam Parnia, assistant professor of critical care medicine at Stony Brook Medicine.

“If attempts are made to reverse this process, it is referred to as ‘cardiac arrest’—however, if these attempts do not succeed it is called ‘death.’ In this study we wanted to go beyond the emotionally charged yet poorly defined term of NDEs to explore objectively what happens when we die.”

Parnia says other key findings of the study include:

- In some cases of cardiac arrest, memories of visual awareness compatible with so called OBEs may correspond with actual events.

- A higher proportion of people may have vivid death experiences, but may not recall them due to the effects of brain injury or sedative drugs on memory circuits.

- Widely used yet scientifically imprecise terms such as near-death and out-of-body experiences may not be sufficient to describe the actual experience of death. Future studies should focus on cardiac arrest, which is biologically synonymous with death, rather than ill-defined medical states sometimes referred to as “near-death.”

- The recalled experience surrounding death merits a genuine investigation without prejudice.

In the study, 39 percent of patients who survived cardiac arrest and were able to undergo structured interviews described a perception of awareness but interestingly did not have any explicit recall of events.

“This suggests more people may have mental activity initially but then lose their memories after recovery, either due to the effects of brain injury or sedative drugs on memory recall,” explains Parnia.

What people remember

Among those who reported a perception of awareness and completed further interviews, 46 percent experienced a broad range of mental recollections in relation to death that were not compatible with the commonly used term of NDE’s. These included fearful and persecutory experiences.

Only 9 percent had experiences compatible with NDEs and 2 percent exhibited full awareness compatible with OBE’s with explicit recall of “seeing” and “hearing” events.

The full range of recalled mental and cognitive experiences included: 1) fear; 2) animals/plants; 3) a bright light; 4) violence/persecution; 5) deja-vu; 6) family; 7) recalling events after recovery from cardiac arrest.

Parnia cautions that exploring consciousness and the state of the human mind at the time of death is very complex and continued investigation is necessary to further understand what happens at the time of death.

In addition, the researchers also conclude that further studies are needed to explore whether awareness (explicit or implicit) may lead to long term adverse psychological outcomes including post-traumatic stress disorder.

Parnia, who is also director of resuscitation research at Stony Brook Medicine, is lead author of the study in the journal Resuscitation.

Source: Stony Brook University

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