Check Wikipedia, Wikipedia's introduction is very simple, only one sentence, as follows:
Scene: a feeling of deja vu, something or a scene that has never been experienced, as if it had been experienced at a certain time and place.
Check psychology books, there are the following:
Deja - vu
A feeling of deja vu
I have a feeling of deja vu. I seem to have seen (heard of) it somewhere.
(I remember in the movie The Matrix, Neo saw a black cat, and then saw an identical black cat passing by, and immediately said deja vu.)
I have read an article about appearances before, which is copied as follows:
Yu Qian Zhao phenomenon, the French original is dé jà vu, and the Chinese translation is "visual sense", which is simply "deja vu". Things or scenes that have not been experienced seem to be deja vu experienced at a certain time and place. There is also an English song called Yu Qian Zhao. "When you see familiar faces, but you don't know where they come from, will you be wrong? /When you go to a place you know you've never been, can you be sure? Because you know this has happened before, you know this moment is real, and you know when you feel deja vu. /It feels like I've been here before .../There was a conversation. Isn't it strange that you realize you've had it before? /Have you talked to anyone? You think you know what will happen next. The feeling is arranged in advance. Because you know you've heard it before, you think this moment is surreal. Because you know that when you feel Yu Qian Zhao, this lyric vividly answers the phenomenon of deja vu. However, the theory to explain this phenomenon in modern science is far from satisfactory. According to the questionnaire survey, two thirds of adults have had at least one "deja vu" experience. And the more imaginative people are, the more likely they are to experience strange feelings; People who travel frequently are more likely to feel deja vu than those who stay at home for a long time; In addition, people with higher education can feel this feeling better than others (perhaps this is because they have experienced unique feelings in Tolstoy or some literary masters). The survey also shows that the incidence of "deja vu" is the highest in youth, and then gradually decreases with age. Especially when people really start to repeat the monotonous life day after day, the incidence decreases. A century ago, when Freud's theory was the mainstream of leadership psychology research, analysts interpreted "deja vu" as the embodiment of subconscious conflict. But now psychologists have suggested that "deja vu" does not necessarily happen on the basis of deep subconscious conflicts. The average healthy brain will feel this way. Moreover, when people are tired and stressed, it is easy to feel this way. In addition, it may be accompanied by "jamaisvu", that is, when you see familiar things or words, you can't remember anything. Psychologists also point out that the feeling of deja vu may be due to people accepting too much information and not paying attention to its source. Familiarity will come from various channels, some real and some illusory. When you encounter a situation described in the novel that you have forgotten, you may regard it as a memory of your past life. In other words, when you see the real scene of the movie, although you have completely forgotten the movie on the surface, you will still recall thrilling memories in your mind. Psychologists also point out that people sometimes don't need real memories at all, and it is possible to create a familiar feeling inside the brain.
There are several explanations for excluding preconceived so-called scientific views:
1, the human brain is always making up various scenes, mainly subconscious activities. When you encounter a similar scene in reality, it will echo the previously fabricated scene in your memory, and with the psychological strengthening, you will feel deja vu. Because people are sleeping, the brain is still calculating some parameters in reality and getting many results. Deja vu is one of the results of brain operation.
2. Researchers believe that it may be that an impression has been hidden in the dreamer's subconscious for a long time, and then occasionally appears in the dream. Some studies have also pointed out that this phenomenon is related to another subconscious mind that transcends time and space. On the other hand, some brain activity researchers point out that this phenomenon may also be due to the fact that one side of our brain processes information slightly faster than the other.
3. Is this a collision of time tunnels or a memory of a dream? You have seen the scene that will happen in your dream, but you can't remember what happened in your dream, so when it happened, you would feel as if you had experienced it there. In fact, it reminds you of your own memory, the memory of your dreams.
There is another explanation for this in medicine, that is, the phenomenon of instantaneous discharge in cerebral cortex, or false vision, or visual memory, which often happens when you are in a very familiar environment. Our brain has a memory cache. When you see something or encounter something, you first store the memory and then cache it. The reason why what happened in front of us seems to have experienced this feeling is because we made a mistake in memory storage and put it in historical memory. When you look at what happened in front of you, you find it out from the historical memory, and you feel as if it had happened before. This illusion is more likely to occur when the brain is tired.
5. The difference of stream of consciousness between life and death. Death/\ life \ _ _ _/death. This is a moving picture of human consciousness. People are born with consciousness, and this consciousness has been advection until death. After death, consciousness will follow a tortuous route back to birth, and so on. Because of the tortuous route after death, the memory of life is recorded in sections, and only the memory of the contact point can be entangled with the consciousness of the next "life", and deja vu will occur. As for why young people and old people have this phenomenon, it is also easy to explain. The normal ideology of young people is still forming, while the brain of the elderly has a strong memory function. Middle-aged people often ignore this feeling because of the pressure of life, rather than being absent.
6. Physically, this phenomenon is called time reversal, that is, after the speed is greater than the speed of light, time and space are staggered, and the four-dimensional space is occasionally chaotic. When a scene happens, the control nerve (a part of the central nervous system) will be transmitted to the memory nerve at a very fast speed. At this time, the brain's reaction has not yet reached the memory nerve, so when the brain's reaction reaches the memory nerve, it will make people feel what happened before. Some scientists speculate that the transmission speed of control nerve and memory nerve will be greater than the speed of light. This is a great challenge to relativity. Of course, this theory has not been proved, it is only a guessing stage.
7. Although orthodox scientists refuse to talk about the existence of soul or deny this view, there is no room for it, but the involvement of high-energy physics and other marginal physics in this issue is undeniable. The first is to explore the composition of the soul. Some heretical physicists put forward that the essence of the soul is a kind of high-energy particles (there is a lot of speculative evidence in physics, because although human beings can rely on physical laws to predict its existence, human scientific and technological strength is not enough to verify it, including many kinds of high-energy particles, etc. ), it carries huge energy and can break through the barrier of time and space, that is to say, it can move in time and space. This inference is completely in line with Einstein's theory of relativity. Its uniqueness lies in that it can move in disorder in time and space as a carrier of information. All the memories and thoughts in our minds can be called information. Although it is not clear what the nature of information is, it is certain that brain waves have a certain effect on it. This is what we call thinking or conscious activity in the brain. And this kind of particle is usually widely distributed in the space around us, and of course it also exists in our brains. It is precisely because of its characteristics that we can receive external information for thinking, remembering, recalling and forgetting. The so-called forgetting is that some particles with information swim out of the conscious space of our brain. Unfortunately, it is still unclear what causes the attraction and repulsion between particles, which may be related to our brain waves and other brain chemicals. However, when our brain dies, a large number of particles will swim out of the memory area in our brain. Because the principles of attraction and repulsion of such particles are not clear, it is impossible to explain and calculate their free ratios. In the case of low probability, this particle still maintains its original arrangement in the human brain after being free, in other words, it maintains the basic personality and memory of this person (who has died). When they meet a new combination target (another person's brain) and combine, when this person is a newborn (no memory has been formed), personality transfer will occur, which is what we usually call reincarnation or possession. However, there are also unexpected situations, such as being in a latent state after combination until suddenly awakening after a certain period of time, which is what we often call personality mutation. (It also exists when people whose memories have been formed wake up after combination, making them lose their original personality. In fact, we have been bound by this particle. For example, we suddenly had a strange idea, and some words suddenly appeared in our minds ... even dreams and predictions can be explained by this theory. Vision can also be explained in this way.
8. Time and space are out of order. For example, you need a tool, but you can't find it anywhere in the house, but after a while or a while, the tool is clearly in the usual place. From Einstein's point of view, there are many time and space in this world, and each time and space runs according to general laws. They are parallel, generally have no intersection, but have a time sequence. But there are exceptions, when time and space intersect, that is, space-time disorder, which will lead to the disappearance of tools. For example, if a pair of pliers is missing, where is it in the blink of an eye? That is to say, the pliers are temporarily transferred to other time and space, and this time is making you. So do people. If it happens that your time and space intersect with the future time and space, that is to say, you will come back soon after entering the future time and space for a short time. If you use pliers to repair your bike in the future time and space, you will do the same thing when you return to the present time and space, but you have stored it in your memory, so you feel that this scene seems to have been experienced somewhere. This has nothing to do with age and other experiences.
At this point, to be honest, I still don't know much about deja vu. I can only choose one explanation or identify one for my emotional tendency. The temperature of time will change for no reason. We can only helplessly watch the passage of time, but we can't grasp it. This is both the cruelty of life and the happiness of life-we are getting old slowly. If our children and grandchildren can still remember you, this is your only legacy in this time and space. In other words, this is the meaning of ancestor worship.