There have always been two extremes in saying goodbye after the dying. Traditional thoughts believe that relatives who have just died can still hear everyone in the ward discussing afterlife and dividing their property, which will make the deceased very sad! Those who believe in modern science say that if people die like a lamp, how can they care if they don’t know anything?
Although discussing these things in front of the deceased is indeed not humane, the people who eat melons also want to know, can the deceased really hear it during the discussion?
What is the process of human death? Can you hear it after death?
There are two deaths of human beings, one is and brain death . This understanding is very simple. Just like the computer’s CPU burns, even if the peripheral hardware is intact, it will die, but the computer’s CPU can be replaced by another. There is no need to change the brain, and it is no longer the ego if it is changed!
The other is that the peripheral key organs are broken, such as the motherboard south bridge and north bridge, or the power supply, or the power supply chip, etc., and the computer will also hang. In this case, you can usually replace the accessories, so many people Organs can still survive for many years after transplantation, and of course, after spreading like cancer, the whole body is full of cancer cells, and there is no chance to change "parts", then it is completely useless.
Let’s discuss the latter, because patients with direct physical brain death probably don’t need to discuss it. Just like if you use an electric drill to make a hole in the computer CPU, then I can’t get up if I call him !
After a person dies, which organ strikes at the latest?
The answer is really hearing!
The first thing that disappears is vision. This seems to be easy to understand, because it may not even have the strength to lift the eyelids, and the brain needs to consume a lot of energy to process stereo vision, so close your eyes when you are weak. .
Then what disappears is the sense of touch, but the human body will finally supply energy to the brain,The body surface will lose blood and temperature, and the sensory nerves without blood supply will be unconscious and numb.
The last thing that disappears is hearing. The reason is simple, because hearing is the closest to the brain, and auditory conduction is through the hair cells in the inner fluid of cochlea, which convert sound signals into electrical signals, and then pass them to the brain , Its conduction nerve is very short and consumption is very low, basically as long as the brain is alive, there will be hearing.
Do you still hear after death?
The electrical signals transferred from the hair cells of the cochlea need to be sent to the brain for processing to form the sense of hearing. Otherwise, it is like a dynamic microphone. The electrical signals emitted after vibration are not processed by the circuit, so this signal has no meaning.
So theoretically, the electrical signal sent by this cochlear hair cell after brain death is "no one" processing at all, so how can the sense of hearing come from?
"Scientific Reports" overturned research and refreshed our understanding
On July 8, 2020, scholars from the University of British Columbia published an article in "Scientific Reports" with the title "Continuous Hearing at the End of Life", It tells a very interesting phenomenon about the brain's response to sound when the human body is dying. This discovery will help family and friends to give last-minute care to their loved ones at the last moment.
The researchers used EFG (electroencephalogram) to assist in measuring brain activity. They analyzed the difference between healthy controls and dying patients, and the process to non-response. The researchers found that from formal A few hours before death, the patient entered a period of unresponsiveness.
However, the researchers found that even in patients who are dying, their response to sound is much more pronounced than other methods of perception. That is to say, even if the patient has no perception, he is entering the formal Before brain death,The surrounding sounds can still be heard, so theoretically, even if there is no response, the visiting relatives can let the patient know that they are visiting him through words.
Lawrence Ward, a professor in the Department of Psychology at UBC, said that he compared the recognition of sounds by multiple patients and healthy people to confirm this finding. Dr. Gallagher, who has 30 years of experience in dying concerns, also said that she has witnessed the very positive side of dying concerns for patients, so she agrees with this finding.
However, according to the researcher, although the research shows that there is a response, it is impossible to measure from a practical perspective whether the patient really understood and processed the information, because the patient who entered the death procedure could not tell the researcher.
New York University Langon School of Medicine's research
New York University Langon School of Medicine's intensive care and resuscitation research project leader Sam Parnia's research is even more amazing. They found that in the heart Stop beating, the brain stops supplying blood to the brain wave stops this time interval, some of them exceeded their estimates.
In 2013, researchers from the University of Michigan in the United States induced heart disease on 9 anesthetized experimental rats, and then observed the brain wave activity of the rats after clinical death, and they observed a period of "emergency state" To put it simply, the human body will burst into an emergency state of excitement after the heart stops beating and the brain stops supplying oxygen. The state at this time is sufficient for the brain to process many physiological processes!
Figure 1 The schematic diagram of the rat brain (left) and the human brain (right)
But the relevant researchers did not say how long this time is, but one thing can be understood is that these activities are all It can be diagnosed by brain waves, and modern brain death judgment standards are much stricter than this, so theoretically, it is entirely possible that the heartbeat can hear the sound.But it is impossible after brain death.
So everyone who eats melons can also chat with confidence, but the problem is that there is an ethical issue. We shouldn't do this because of reason. After all, the dead should be the most important thing.
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