SCIENCE BEHIND DÉJÀ VU
Hello everyone and today we are going to discuss DÉJÀ VU. What is it, why does it occur, you know those moments where the current situation feels like that it happened before and you're certain it has but you don't know when, and how it became so familiar.
Scientifically it is proven that humans don't seem to experience Déjà vu until thay are atleast 8-9 years old it's most frequent in your teens and twenties and then tapers off as you get older. So it might have something to do with brain development. Like a stomach ache, Déjà vu may be a symptom with many possible causes. A lot of the popular theories about what causes it involves a disconnect that may be occurring between the deep structures of the brain that processes our experiences unconsciously, and the conscious parts of the brain which process our experience and tell us what we are seeing.
For the sake of simplicity let's begin with the visual system of the brain. Now our eyes sends the signal to the back of the brain, the Occipital love, where visual cortex is.
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| The Visual Cortex |
That's where the image is processed and we become aware of what we're seeing. But visual cortex is not the first stop where the information goes. Instead we know that it stops in lots of other places first. For example, the amygdala, where it may be processed at an emotional level, and then in the tectum which is involved in preliminary visual processing and helps control eye movements.
Now that fact is incredibly important because what it means is that people with blindness caused by brain damage to the visual cortex cannot see anything. They don't report seeing or recognizing anything; however, the other preliminary parts of our brain that get that message are still healthy, and so, despite being legally blind, these people exhibit what is known as blindsight. They can defy all odds and avoid an obstacle course on the ground and can even feel emotions when faces expressing feelings were shown to them.
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| The Amygdala |
So, a lot is going on when we look at things, and if those preliminary structures in the vision system allow certain blind people to be oddly and unconsciously aware of what they're looking at, we may have the ingredients we need for this disconnect. Think of it this way. If I experience event A and then B and then C, and the inner parts of my brain commit it to memory and generate an emotional response, but my visual cortex gets out of synchronization and a fraction of a second later, my visual cortex finally gets around to telling me, the conscious part of my brain, what I'm seeing.
It will say we are looking at A and then B, and then......and then the brain says "Wait, wait, wait and then C, right? That's already happened I thought?....." and that is déjà vu and this familiarity happens because it is already stored in our inner parts of our brain our preliminary visual cortex where the information first makes before going to visual cortex.
But what could cause these processes, dealing with the same information, to get temporarily out of synchronization like that? Well it's probably a neurological abnormality, and this events are called epileptic events and they are quite common causing déjà vu.
So I hope you found this article on déjà vu interesting and if you learnt something new share it with your friends.
The Comprendia was founded in 2019 owned and managed by Neelabh Jaiswal is an Indian technology news and science website which covers the intersection of science, astronomy, technology and engineering. It's mission is to provide in-depth relevant information and knowledge.
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