What causes you to have deja vu?
362333
I read somewhere that your neurons in your brain fire, and register the information, then they fire again, registering the same information milliseconds later.  Your brain interprets this as a faint memory.
13008
In psychology, there has been a theory that the 'deja vu' feeling might be cause by the double firing of the neuron cells in ones brain.
184722
i think its crazy to have deja vu. but i also think that it is one of the amazing things, it has you trippin out
832247
Sounds like Déja Vu.\n\nIt has been speculated by some that this results from one side of the brain processing information a split second after the other. Thus, one part of your brain experiences an event, and it is recorded there. Then immediately the other side "experiences" the same thing, and it recognizes it as something that has already happened, because it "remembers" what the other side experienced just previous to this.
1186522
One explanation I've heard is that the brain is storing the present into memory so quickly, we perceive it as happening in the past.\n\nThere are also the theories of parallel universe travel or having dreamt something very similar to the present.
847661
deja vu, is french, accepted into the american english language...literally translates (already seen).... usually means when you felt that you lived the situation once already. (or seen it coming)
698228
you sound just like me! \ni have adhd too. im not sure exactly what it is but i know that a symptom of adhd is deja vu. like where you do something and then your just like 'wait a minute, didn't i already do this?' like you had a vision or something. also me and one of my friends with adhd feel someone is in the room with us too just like a sixth sense or something. i've been thinking the same thing your thinking but i dont know how to find out what it really is. if i ever find out i'll tell you. if you find anything out tell me too! good luck
941689
There are many theories, including dream travel, telepathy, and reincarnation. According to scientific research, it is merely a false memory which is created in the subconscious mind. For example, one may percieve a present scene, but their subconcious will regester it as a past event. It is often linked to schizophrenia and anxiety disorders. However, people with synesthesia, out of body, or near death experiences may frequently experience Deja Vu.
922221
Deja Vu. It is French for already seen. I don't believe in it myself. I have heard it explained as your mind mixing memories of real past events with elements of the new experience. I am not sure if I find that really believable either.\nhttp://people.howstuffworks.com/question657.htm\n\nIn this article they note the age point. This might be a normal event in a maturing brain. I would not let the mention of epilepsy scare you because people with no epilepsy get it too.
328977
The term déjà vu (French: "already seen", also called paramnesia) describes the experience of feeling that one has witnessed or experienced a new situation previously. The term was created by a French psychic researcher, Emile Boirac (1851–1917) in his book L'Avenir des sciences psychiques (The Future of Psychic Sciences), which expanded upon an essay he wrote while an undergraduate French concentrator at the University of Chicago. The experience of déjà vu is usually accompanied by a compelling sense of familiarity, and also a sense of "eerieness" or "strangeness" or "weirdness". The "previous" experience is most frequently attributed to a dream, although in some cases there is a firm sense that the experience "genuinely happened" in the past.\n\nThe experience of déjà vu seems to be very common; in formal studies 70% or more of the population report having experienced it at least once. References to the experience of déjà vu are also found in literature of the past, indicating it is not a new phenomenon. However, in laboratory settings, it is extremely difficult to invoke the déjà vu experience, making it a subject with few empirical studies.\nTypes of déjà vu\nAccording to Arthur Funkhouser there are three types of déjà vu:\n\n[edit]\nDéjà vécu\nUsually translated 'already seen' or 'already lived through,' déjà vécu is described in a quotation from David Copperfield by Charles Dickens:\n\nWe have all some experience of a feeling, that comes over us occasionally, of what we are saying and doing having been said and done before, in a remote time - of our having been surrounded, dim ages ago, by the same faces, objects, and circumstances - of our knowing perfectly what will be said next, as if we suddenly remember it![1]\n\nWhen most people speak of déjà vu, they are actually experiencing déjà vécu. Surveys have revealed that about one third of the population have had these experiences, more often (and perhaps more intense) in people between the ages of 15 and 25. The experience is usually related to a very banal event, but is so striking that it is remembered for years afterwards.\n\nDéjà vécu refers to an experience involving more than just sight, which is why labeling such "déjà vu" is usually inaccurate. The sense involves a great amount of detail, sensing that everything is just as it was before. Because of this, theories that the situation was just read about earlier or experienced in a previous life are invalid, as those experiences could not recreate the exact situation due to a lack of sense involvement or the presence of modern surroundings.\n\nMore recently, the term déjà vécu has been used to describe very intense and persistent feelings of a déjà vu type, which occur as part of a memory disorder. As described in Moulin, C.J.A., Conway, M.A. Thompson, R.G., James, N. & Jones, R.W. (2005). Disordered Memory Awareness: Recollective Confabulation in Two Cases of Persistent Déjà vecu. Neuropsychologia, 43 :1362-1378.\n\n[edit]\nDéjà senti\nDr. John Hughlings Jackson recorded the words of one of his patients who suffered from temporal lobe or psychomotor epilepsy in an 1889 paper:\n\nWhat is occupying the attention is what has occupied it before, and indeed has been familiar, but has been for a time forgotten, and now is recovered with a slight sense of satisfaction as if it had been sought for. ... At the same time, or ... more accurately in immediate sequence, I am dimly aware that the recollection is fictitious and my state abnormal. The recollection is always started by another person's voice, or by my own verbalized thought, or by what I am reading and mentally verbalize; and I think that during the abnormal state I generally verbalize some such phrase of simple recognition as 'Oh yes - I see', 'Of course - I remember', &c., but a minute or two later I can recollect
185650
yes, it's happened to me but when it happens it just feels weird and really really different. I wonder if it's a completely different feeling than what we normally feel everyday. they should have a name for it besides de ja vu. its just weird. haha.
914126
It's from the french and it literally means "already seen".\nSo Déjà vu: Is a feeling where you strongly feel like you already have seen somthing that is hapening, like if you had already lived it. Some times it can be so strrong that while you're in the middle of somthing you can even prdict how things will take place. \n\nFurther than that I must admit myself to be ignorent. So i'll be watching the up comming answers.
589605
Well, there's nothing for certain. But I have surely had several dreams that have become true. Like everything in it. Gives you the sensation of deja-vu.
742842
sudden onset of a break with reality...hallucinations, delusions etc.
279489
Interesting question!  I am really looking forward to the answers on this one.\n\nI used to think I was having past life memories.  I was having a deja vu-type experience very often, like every few hours.  I would remember a memory that wasn't my own.  To this day I'm not sure whats happening when it occurs (still pretty much daily) but I'm sure its just some wires getting crossed in my brain somehow.
443369
It's called Deja Vu, and is actually a borrowed word brought into English from the French language.\n\nAs far as I know, we're really not sure exactly why it happens.\n\nThere are several theories - 1 states that somehow our consciousness and our brain run momentarily out of sync, which cause our brain to take visual input from an experience but processes it a little later, so that by the time we realize what we've seen our brain has actually already "seen it" (but we're talking at very high processing speeds). \n\nAnother theory states simply that we have been in a similar situation before but have just forgotten, so when we are in it again it seems new to us but somehow just vaguely familiar.\n\nYet other esoterics say that it is actual memories from past lives.\n\nHappy researching!
755106
i think its your brain somehow writing your current experiences on some previous date in its journal of memories, and then seeing that it has already gone through this before.  Then, its a really weird feeling\n\nbut i really have no clu