Déjà vu. This is a phenomenon that has reportedly been experienced by many, 70 percent of the population approximately, but no one knows exactly what it is they are experiencing or why they are experiencing it. Is it possible that our brain remembers specific events or situations that we think we are just experiencing for the first time? Many people will report the feeling of experiencing a situation where they are visiting a place or having a conversation with someone for what they believe is the first time, but their brain, or mind, tells them otherwise.
Why does this happen? You could be taking a trip to a foreign country for the first time in your life, but you get a feeling like you have been there before. How does your brain remember the scenery if it hasn't seen it before? Scientists still aren't exactly sure why this experience occurs in humans, but they have some theories as to why it does. Scientists believe that déjà vu is directly related to the temporal-lobe epilepsy and déjà vu has reportedly been occurring before a temporal-lobe seizure. Déjà vu occurs in many people without this condition, so some psychoanalysis contributes déjà vu to fantasies or wishful fulfillment. Others believe that it is a mismatch in the brain where it confuses the past from the present. There are still many theories as to why déjà vu occurs. Many things may be correlated as to why déjà vu occurs, but because it is such a complex occurrence in our minds, it is hard to tell what truly causes this confusing experience.
I found some information on :http://science.howstuffworks.com/science-vs-myth/extrasensory-perceptions/question657.htm
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