Déjà-vu means already seen if translated from French literally, or its called “Paramnesia” from the Greek language, its also called “Promnesia”  These words all translate into human terms as an experience we feel sure we have experienced previously.

The term Déjà-vu was first used by a French psychics researcher named “Emile Boirac” in his book “LAvenir Des Sciences Psychicques translated means “The Future of Science Psychics” Emile found the essence of Deja-vu to be an anomaly in the brain, when Deja-vu is experienced it is usually accompanied by the feelings of weirdness or extreme familiarity. 

Experiments were carried out in the late 20th century by psychological experts, who tried to recreate Deja-vu in laboratory conditions.  The experience of Deja-vu or “Precognition” could not be reproduced.  The Precognition theory is that Deja-vu is not a chemical imbalance in the brain, it is in-fact the future being recalled!

Another well thought of theory is that Deja-vu is caused by the distance between our eyes and an object, as we have Binocular vision, I.e. two eyes focusing on the same object.  The minute difference between the eyes, causes a time difference of the picture received by the brain, I.e. your right eye may see an object before your left eye?  As we know the brain sorts out inputs from our senses for our conscious visions.  Whether they be through smell, touch, sound, or sight.  The brain sub consciously sees an object before it translates it for us into an order of recognition.  So when our conscious mind sees the object in question we have a feeling of Deja-vu! Because the brain has already seen it.

There has been much research carried out on the amount of our brain we actually use?  For a long time scientists have claimed we use only 10% of our brain capacity.  More recently research has been aided by technology I.e. brain scans and the ability to measure electrical activity in the brain.  Scientists now prefer the percentage of 50/60% of brain capacity is used.

Severely brain damaged patients are forced by nature to use sections of their brain that have possibly been dormant before.  Nature is surely the most diverse scientist of them all!  These unfortunate patients have a heightened sense of Deja-vu, now is that because of brain damage or they are forced to use a section of the brain which can see into the future or into the past?  That theory is a long shot but I wouldn’t rule it out.