The sensation of having already experienced something that
is occurring for the first time is normally termed as Déjà vu.
Déjà vu is a French phrase that literally means "previously seen," and it was named after French scientist Emile Boirac, who was one of the first to research this peculiar occurrence in 1876.
You could assume you're seeing something for the first time if your initial glimpse of it, such as a view from a hillside, didn't need your whole concentration. However, even if you weren't fully conscious of what you were seeing, your brain remembers the prior perception. As a result, you have a sense of déjà vu.
Déjà vu can occur in a healthy brain. This does not imply that you should sound the alarms.
Déjà vu is a contradiction between a sense of familiarity and the realisation that familiarity is false.
And it's the consciousness that you're being duped that distinguishes déjà vu from other memory occurrences. Experts indicate that déjà vu might be caused by a variety of factors. Most people agree that it has anything to do with memory.
The number of persons who get déjà vu is probably between 30% and 100% (about 8 in a class of 30). (Everyone in a class of 30). If you're between the ages of 15 and 25, you're more likely to feel déjà vu than you will be in the future. After the age of 25, the number of persons who have déjà vu encounters progressively diminishes.
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