The mysterious phenomenon of Deja Vu Have you ever visited a home for the first time and suddenly you feel familiar with the house? Or have you ever been in an event when suddenly you feel that you've experienced it, although you can not remember when it happened? That's deja vu, a mysterious phenomenon in human life. "Uncle, I feel that I've done the same, the same movement and others" One day, the sentence above into the comment box on this blog. Although that sentence sounds scary and mysterious, but for this case it looks like I have the answer. This is called deja vu. Many of us have heard this word, but probably few know its meaning. Deja Vu definition Deja vu is a French word meaning "already seen". This word has several derivatives and variations like deja vecu (has experienced), deja inches (was thinking) and deja visite (already visited). Deja Vu's name was first used by a French scientist named Emile Boirac years studying this phenomenon in 1876. In addition to deja vu, there is another French word which is the opposite of deja vu, the Jamais Vu, which means "never seen". This phenomenon occurs when a person is temporarily unable to recall or recognize events or people who have never known before. I think most of you are also often experienced. Before we look at the deja vu, first, we need to know what is called the "Recognition Memory", or recognition memory. Recognition Memory Recognition memory is a type of memory that causes us to realize that what we experience now in fact we have ever experienced before. Our brain fluctuates between two types of Recognition Memory, Recollection and familiarity that is. We call a memory as a Recollection (gathering again) if we could mention the exact instant when the situation we are experiencing ever appeared before. Example, if we meet someone at the store, then immediately we realized that we had never seen before in the bus. While the memory is called familiarity comes when we can not call exactly when we look at the man. Deja Vu is an example of familiarity. During the Deja Vu, we recognize the situation we're facing, but we do not know where and when we had to face before. Believe it or not, 60 to 70 percent of people on earth most have never experienced deja vu at least once, whether it be a sight, sound, taste or smell. So, if you are experiencing deja vu, you are certainly not alone in this world. Theories of Deja Vu Although Emile Boirac has been researching this since 1876, but he never completely finish his research. Therefore, many researchers have tried to understand this phenomenon so that finally we get at least 40 different theories about deja vu, ranging from paranormal events to neurological disorders. At this writing, I may not discuss the 40 theories one by one. So I'll pick a few theories that I think needs to be known. First, I will start from the theory of the legendary psychologist, Sigmund Freud. But before that, I want to show you a very famous picture. Here it is: The photo above is a photo illustration "Tip of the iceberg" of the famous. The experts' brains "are using the above illustration to show what our real thoughts. Surface water is the limit of our consciousness. Conscious of our minds is the chunk that appears above sea level. While the subconscious mind is a giant chunk of that is in the sea. According to them, in fact most of the information we receive is stored in our subconscious mind and have not come to the surface. Only a fraction of the information we receive we really remember or realize. This principle is an important key to understanding the Deja Vu. Memory access interference Sigmund Freud is often dubbed as the father of psychoanalysis have been researching about this phenomenon and it is believed that a person will experience Deja Vu when she spontaneously recalled by an unconscious memory. Because the memory is located in the area of the subconscious, memory content does not appear as barred by the conscious mind, but those familiar feelings leak out. Freud's theory proved to be the basis for the theories that emerged next. But before I discuss the other theories, I would like to invite you to get to know these words are, the "Subliminal". Subliminal derived from the Latin word, the "sub" and "Limin or Limen". "Sub" means under, while "Limin" meaning threshold. In terms of psychology, subliminal means operating on the conscious. Again related to the unconscious. My intention is to introduce this word to understand the theory below. Distracted - the theory of mobile A researcher named Dr. Alan Brown had conducted an experiment that is expected to recreate the process of deja vu. In his experiments, he and his colleague Elizabeth Marsh subliminal suggestion to the subject of research. They showed a bunch of photos showing the different locations to a group of students in order to ask them which ones are considered the most familiar to them. In this experiment, all the students who were tested had never been to the locations in the image. But before they showed the photos, they first showed some of the photo on the screen with subliminal speeds of about 10 to 20 milliseconds. Speed is sufficient for the human brain to store information in the subconscious, but not enough for students to be aware and pay attention to him. In this experiment proved that the locations on the photos they've posted a speed of subliminal thought to be most familiar to the students. A similar experiment conducted by Larry Jacobi and Kevin Whitehouse of Washington University. The difference is, they use a set of words, not pictures. However, the results obtained with experimental Dr. Alan Brown. Based on the results of his experiments, Dr.. Alan Brown then proposed a theory called the theory of the phone (or distracted). This theory says that when we divided attention, then, is subliminal, our brain will store information about the conditions around us but not really aware of it. When we begin to focus attention again, all information stored on our surroundings is subliminal will be "called" out, so we feel more familiar. This is the same as the iceberg under the surface of the water that rises to the surface. Example, if we enter a house while chatting with others, then our attention will not be glued to the condition of the house, but our brain has stored the information that the subliminal subconscious. When we finished talking, we started to focus the mind and the information stored in the unconscious began to emerge. Immediately we began to feel familiar with the house. So based on this theory, deja vu is not related to past events that have lasted long. Memory from other sources There is another theory that matter. This theory believes that our brains store a lot of memory that come from various aspects of our lives, as we watch movies, pictures or books we read. This information we store without us knowing it. In line with the passage of time, then when we have events similar to the information we have stored, the memory is stored in our subconscious will rise again. Example, as a child, we may never watch a movie that has a scene in a memorial or monument. As adults, we visited this monument and all of a sudden we felt familiar even though we do not remember the film. This theory is similar to the theory of cell phones, but this theory agree that the deja vu associated with events that have lasted long in the past. Dual processing theory (vision is pending) In many ways, theories concerning the cause of Deja Vu does not differ much from that proposed by Sigmund Freud. However, a researcher named Robert Efron trying to look further into the mechanism of the brain, not just a conscious or unconscious mind. Although highly technical, he advanced the theory is considered as one of the best theory of Deja Vu ever. Efron theory is related to how our brain stores long-term memory and short term. He tested this theory in 1963 at the Boston Veterans Hospital. According to him, a late neural responses can cause deja vu. This is because the information that goes into processing centers in the brain pass more than one pathway. Efron found that the temporal lobe of the left brain is responsible for sorting incoming information. He also found that the temporal lobe receives incoming information twice with a slight delay between the two transmissions. The information was first entered directly into the Temporal lobe, while the second time the brain take a spin through the right side first. If the delay is going a little longer than usual, then the brain will give a false record of such information with regard such information as the memory of the past. Deja Vu - I never write like this. No, I'm just kidding. This is my first time writing about Deja Vu. Although not as scary as the doppelganger phenomenon is also often associated with brain activity, Deja Vu still regarded as a remarkable phenomenon mysterious. But if you ask about my opinion, I think Sigmund Freud has solved the mystery.