One day, I dreamed that my classmate stuck tape on the table, and then when school started, I really saw him sticking the table at the same angle, time and position. ...

Hello, dream master, let me explain this dream to you-the feeling of deja vu.

In fact, this situation does not exist. "I can often dream about the future", because the human brain processes perception in a special way, which is processed by three groups of neural circuits: face perception, object perception and position perception. These three circuits are located in the second half of the temporal lobe of the brain, relatively close to each other.

Similar to perception, memory can be divided into many types. The memory of knowledge and concepts is called semantic memory; Memories of plots, experiences and events, that is, situational memories, and habitual memories formed unconsciously, are all unconscious memories.

Because perception and memory are classified, many features of some scenes we have experienced will be stored in different memory systems, but we didn't realize it at that time. When we come to a new scene, some parts of the scene may stimulate some of our memories and mobilize different memory systems in our brains to match them. At this time, once a certain feature in the scene matches the past experience, there will be a feeling of deja vu.

This is the reason for the subjective experience of deja vu. It is because people's perception and memory have such a basic feature of "classification" in the brain. Perception activates some contents in memory and matches them with some characteristics in perception. However, after careful consideration and repeated confirmation, this is still a new contact scene, not an experience I have had before. Everyone has a life experience, because there are many things to remember, and it is normal to have a subjective experience of deja vu occasionally.

The following is an example in history:

The initial understanding of deja vu originated half a century ago, and the medical treatment of epilepsy opened the way for scientists to explore this wonderful experience.

The initial understanding of the subjective experience of deja vu began with medical epilepsy and can be traced back to half a century ago. Professor Shen told reporters that at first "deja vu" attracted the attention of medical scientists and psychologists. Later, according to statistics, normal people will have this kind of subjective experience, and with the accumulation of brain science knowledge, they will gradually reach today's level of understanding. According to him, more than 50 years ago, Panfield, a professor of neurology at the University of Montreal, Canada, performed brain surgery for epileptic patients to remove epileptic foci or brain tumors. In the process of resection, epilepsy will recur because of less resection, and the normal function of related brain tissue will be destroyed because of more resection; Therefore, in order to ensure the accuracy of the operation, doctors must conduct a health test on the brain tissue around the epileptic focus or tumor before operation, so as to accurately grasp the scope of brain tissue lesions. The doctor stimulated the tumor with a probe with weak current to see how these brain cells would react; Then do the same test on brain cells a little farther away. So, something interesting happened.

This is a 60-year-old man, and the doctor is going to operate on him to remove the temporal lobe tumor. When the tissue around the tumor was stimulated, the old man suddenly sang songs in the voice of four or five-year-old children, calling the names of "grandpa", "grandma" and the dog. The doctors present were surprised and chatted with him. Unexpectedly, what appeared in the old man's words was completely a scene of childhood life. The doctors stopped stimulating him and all the conversations were interrupted. When asked what he was doing just now, the old man looked blank and speechless. When told of the amazing scene at that time, the old man asked, "Did I sing? What song did I sing? " Then the doctors electrified him and the old man continued to sing; When the current stimulation stopped again, he knew nothing about his behavior just now.