Who has never had an impression of déjà vu?
Take an example of an impression of déjà vu: we accompany a friend home to see his new apartment, we go through this small street in the city when, suddenly, a strange sensation invades us …
These trees, the architecture of buildings, the way the sun illuminates certain angles … There is something that is intimately familiar to us, but we can not put our finger on it. Have we already gone through this street? No, it's impossible, because this is the first time we come to this city. But then, what's going on in our brain?
In recent years, impressions of déjà vu have been subjected to a series of psychological and neurophysiological research in order to obtain information on this subject.
In reality, this phenomenon is not new; it has always existed in all cultures, throughout all ages, and with the same prevalence in both men and women.
The only difference that we can report is the age group (the impressions of déjà vu are more common among 20-25 year olds). In addition, it should be noted that this phenomenon is more present in people who have a more sensitive character, or in individuals who are more creative or intuitive.
The first explanation that must be taken into account is that the impression of déjà vu is not a supernatural phenomenon.
Scientists attribute it to an overlap between the neurological systems responsible for short-term memory (events that are perceived to belong to the present) and those responsible for long-term memory (events that are perceived as belonging to the past).
In other words, scientists explain déjà vu impressions as a process in which the unconscious mind perceives the environment around us before the conscious mind.
A study by Akira O'Connor of the University of Leeds looked at the case of an Australian man, professor of literature and blind of birth who continually presented impressions of déjà vu.
His experiences were based on sensations, such as "feeling" that it was not the first time he had set foot in this place where he had never been to, or that he met or spoke with strangers while believing they were longtime friends.
This study allowed them to deduce that the impression of déjà vu is not based solely on the visual channel, that is to say that when we see this street for the first time and that we feel assaulted by a series inexplicable sensations, it may be that we would have felt the same if we had been blindfolded.
So what other explanation do scientists offer for the impression of already seen?
Memory of dreams?
Nowadays, research continues in the realm of dreams, to determine how the brain "records and reorganizes" information when we find ourselves in an unconscious state.
This is a really interesting field of study if we take into account the fact that we do not remember most of the dreams we make at night.
A person who sleeps, can present a large deployment of activities in the brain areas related to the process of long-term memory, when we dream of travels, friends, strange and unlikely stories, or stories not so illogical …
It is possible that 5% of what we remember is dreams and not realities.The research will continue while we continue to feel this phenomenon that intrigues us and disconcerts us …