I don't know if you have ever had such an experience: seeing the patient's face and spirit suddenly improve, and his appetite also increases. I thought it was the improvement of my condition, but it was a short surprise. I left soon. The topic of death is always heavy. Although it is human nature to die, many people are puzzled by the abnormal phenomenon that some people appear before their death.
In fact, this is what we call "reflection". Before dying, will there really be a reflection? Why is this phenomenon? What changes will your body undergo before you die? Uncover secrets together.
What is reflection? Will there really be a reflection before dying
Reflection refers to a person's abnormal state of consciousness before death.
In 2019, an article was published in Alzheimer's & Articles in the journal dementia reviewed the possible Neuroscience Mechanisms of reflection.
Abnormal wakefulness may occur in the terminal state of patients with various diseases Since wakefulness occurs very suddenly, this phenomenon cannot be the result of the recovery of the nervous system.
In patients with long-term coma, the brain nerves are often inhibited by toxic proteins, causing abnormal conscious fluctuations, which may be the result of the temporary release or compensation of the inhibitory effect of toxic proteins, the gradual amplification of the transmission signals of the nervous system, the modification of the connections between nerve cells, and the overall regulation of the interaction of the neural network.
Some patients with severe consciousness disorders can observe a significant increase in neurophysiological activities before death. scientists speculate that this is due to the increase of neurotransmitter levels caused by the decrease or fluctuation of oxygen and glucose levels, resulting in a temporary increase in brain activity**
A large number of neurochemical and neuroelectrical signals can be released from some dying or hypoxic brains, which are considered to be related to the functional activities of this complex system. This may lead to the temporary functional integration of neural networks, which is manifested as conscious behavioral activities.
Although the current research on the mechanism of flashback is not deep enough, scientists believe that it is not only the activities of the central nervous system, but also the systemic changes of the whole human body that are the reason for the waking stage before death.
What do people experience when they are dying
The classic death process includes: near death stage, clinical death stage and biological death stage.
1. Dying period
The beginning of death, the pathological changes of heart, lung, brain and other vital organs caused by various factors and the process of functional failure. If an individual is found to enter this stage in time and treated timely and effectively, the near death process may be reversed.
2. Clinical death period
The function of brainstem respiratory center and cardiovascular motor center is inhibited or stopped. It can be seen that the respiration and heartbeat stop, and the blood pressure and pulse disappear. Its duration is about the tolerance time limit of cerebral ischemia and hypoxia (5~6 minutes). If active treatment is carried out within this time limit, there is still the possibility of resuscitation.
3. Biological death period
The last stage of death is irreversible damage or loss of function of the whole brain or brain stem life center.
What other experiences will you have before you die
In the main organs of the human body, the most vulnerable to harmful factors is the brain.
When ischemia and hypoxia reach 5~6 minutes, the brain function will be irreversibly damaged until the function is completely lost (brain death). And in the next period of time, other organs can still maintain a certain survival state, which is the best time for brain dead organ donation and transplantation.
During the process of death, the sensory organs may still maintain certain functions for a period of time. The most famous example is the near death experience. Moody and other scholars in the United States analyzed the data described by the near death and attempted suicide, and summarized five basic stages of near death experience:**
Calm, serene and relaxed
Consciousness escapes from the body
Through "black hole" and "noise"
Get together with family and friends
Looking back on life in the light and merging with the universe
Different scholars have different interpretations of near death experience:
*Pharmacological explanation: * near death experience is a hallucination caused by the treatment drugs used by patients. Common drugs include lysergic diethylamine (LSD);
*Biochemical explanation: * when dying, the brain is in a state of hypoxia and secretes excessive neurotransmitters, causing strange hallucinations;
*Neurophysiological explanation: * near death experience is a combination of simple and complex images, which may be a light illusion caused by the electrical signals of nerve cells in the visual pathway;
The explanation of psychiatry: some feelings in the near death experience are similar to the symptoms of psychiatry, such as the sense of disengaging from the body;
The explanation of other viewpoints: the legends about the posthumous world spread all over the world, and the knowledge of the posthumous world may have entered the subconscious of modern people; People who come back to reality from hallucinations are often weak and in a trance. They don't want to be bothered by too many questioners. The best way is to please them.
In addition to "listening" to noise in near death experiences, an article in the 2020 scientific reports magazine believed that hearing may be the last feeling lost after the body dies**
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