The majority of people who have recovered from a coma do not report any experiences that occurred while they were in a coma (clinically unresponsive). However, some people who went into cardiac arrest or were close to clinical death but survived and came back to life have reported having conscious cognitive experiences during these critical periods, when they were in a coma. This type of experience is called a "near-death experience." About 10% to 20% of these individuals report near-death experiences. NDEs include many fantasies, such as tunnel vision, light at the end, and stars. Out-of-body experiences, pleasant feelings Entering a door, entering the door to heaven, or entering hell.
However, the near-death experience is still a scientifically unproven topic. Some believe that the evidence accumulated to date shows that near-death experiences are real, that mind and consciousness can exist outside the brain, and that the current understanding that the brain is the basis of consciousness and mind is incorrect.
Noting that patients react completely differently to an artificial coma. One of the researchers says: "Many of them suffer from nightmares, but not everyone can remember them later."
Others believe that near-death experiences are a neurophysiological phenomenon that occurs while the brain is functioning in an abnormal state, and the evidence is that many of the mental phenomena that occur in near-death experiences can occur or be stimulated in states other than coma, or neurophysiological ; such as sleep, meditation, simple partial seizures, some drug-induced alterations in states of consciousness, electrical stimulation and transcranial magnetic stimulation of the brain. Interestingly, some researchers found that a surge in neurophysiological coherence and connectivity occurred within the first 30 seconds after cardiac arrest.
Mai Khaled