Have you ever experienced the feeling of stepping into a room, for the first time, that you thought you were here? Or talk to your friends about something exactly like what the two of you said before?
There are still many strange circumstances like that. But the common point in all these cases is that you are experiencing a whole new scene, for the first time but suddenly you have experienced them once before, somewhere in the past. although you don’t know it yourself.
Scientists named this feeling Déjà vu – a French word for “have ever seen“.
Explain the Déjà vu experience in 20 seconds
There are many supernatural explanations for the Déjà vu phenomenon. Some believe that the Déjà vu experience is a supernatural ability, meaning that they can predict the future. Others claim that it is when parallel universes intersect and another version of you reminds you of past or past lives.
But the truth, why? Scientists say up to 70% of the world’s population experience Déjà vu at least once in their lifetime. And this phenomenon can be completely explained by science.
In a very brief video posted on Tiktok, Dr. Karan Raj from Imperial College London comes up with a famous theory explaining why we met Déjà vu. Sometimes our brains work really well, he said “negligent”.
“Déjà vu is a glitch in your brain“Dr. Karan explained in the video.”That is when a new, short-term memory is accidentally stored in the long-term memory. So you feel like it happened before because the brain is telling us it’s an old memory.
Dr. Karan Raj explains the Deja vu phenomenon in just 20 seconds
Dr. Karan’s explanation is in fact a theory dating back to 1936 to explain the Déjà vu phenomenon. It was given by American doctor Robert Efron working at Boston Veterans Hospital.
Robert Efron named his hypothesis Dual Processing (roughly translated as Information Processing at the same time). In his previous studies, Dr. Efron discovered that the information could enter the human left and right brain in different ways.
Along the way, he finds a part of his left brain responsible for sorting it. When information flows here it is usually delayed by about one millionth of a second. This delay occurs during processing and occurs again when information is passed through the right brain.
If the delay goes on longer than normal, the brain can classify this new information as old memories. That means the brain is deceived for a moment, that a happening event has happened before.
Déjà vu happened that moment, but it is only because the brain is being deceived, it will not be able to trace it back to that moment in the past.
The Dual Processing hypothesis has been used to explain the Deja vu phenomenon since 1936.
Suppose, when you stand in front of a scene, sight gathers ABC facts. These three data are divided into two processing paths, one through the left brain and the right brain for classification. Here they are taken over: AB-C1.
But at the same time another processing path through the visual cortex is out of sync. It will say that you are seeing fact AB… -C2. Information C1 first gets into the permanent memory, that is, becomes memory. But then the second C2 information appeared as a completely new memory. This conflict created a feeling of Déjà vu.
You cannot force yourself to create Déjà vu, it is a random experience
That being said, at least 70% of the world’s population experiences Déjà vu at least once in their lifetime. People experience this feeling most often at the age of 8-9, and Déjà vu lasts for an average of only 30 seconds.
Unfortunately, you won’t be able to force yourself to create the feeling of Déjà vu. Previously there were a number of researchers trying to do that with volunteers involved. For example, an experiment published in the journal Psychological Science invited 298 volunteers to participate in two scenes from the video game The Sims.
They were shown the same spatial layouts, for example, objects arranged in identical positions, differing only in subject matter. For example, two scenes below, one about the scrap yard, the other is a garden:
Volunteers were asked to take turns following the same paths in both scenes. One goes with the previous animation, once with the following animation. However, before reaching a crossroads in the following animation, the experiment is stopped and the scientists will ask the volunteers whether they feel familiar or not?
Half of the volunteers said they found it familiar. But when asked to guess which direction they would take next, the familiar volunteers could not guess exactly.
This shows that this artificial feeling of Déjà vu is just an illusion. So if you want to experience Déjà vu in real life, it’s best to just wait for your brain to suddenly make a mistake or do “sloppy” work again.
And statistics show that Déjà vu usually only appears once a year, usually during the period when you feel most tired and stressed. It also happens to be more indoors than outdoors.
So you can take advantage of this knowledge to capture the strange 30 seconds the next time Déjà vu happens to you.