Deja-Vu or promnesia, is the experience of feeling sure that one has witnessed or experienced a new situation previously (an individual feels as though an event has already happened or has happened in the recent past), although the exact circumstances of the previous encounter are uncertain.
Deja Vu is when you have visited a place for the first time in your life and suddenly you get the strangest sensation that you've been there before, you've seen and been in the same room, house, park etc
Also you could be having a conversation with someone and suddenly a strong sensation can come over you that you have had this same conversation and been in this same room with the same person, somehow you have seen all this before, but you know that you have not. Maybe you have been to a social event and sat quietly looking around when you suddenly realise that somehow you have seen the same people in the same room before [they could be strangers or friends].
Some people feel lightheaded or dizzy when they've experienced this and it only lasts for a few seconds or minutes, but the impression that you've been there before is very strong.
Explanation
We have two eyes. under normal conditions, we see a thing with both of our eyes, our brain processes the signals coming from both eyes simultaneously and creates the vision of the object in our brain.
Now what if brain processes input from one eye earlier than the other eye? suppose you are watching a football game. your brain is geeing input from both the eyes. now your brain processed the input from left eye live (means as soon as the incident happened in real life), but it processed the input from right eye after sometime (maybe 5-6 milliseconds later. The gap is so small in time that you will never feel the lag). since your brain already processed the data from left eye, there is already an image built into your brain. so when the brain completes processing from both eyes, you get a feeling that you are familiar with the incident.
This is deja-vu.
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