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The phrase "déjà vu" is borrowed from French and means "already seen". Déjà vu occurs when someone perceives they have already experienced a situation before, and their body experiences familiarity with the experience and confusion. This term was first used by Émile Boirac in the year 1876. Boirac was a French philosopher who wrote a book that included the sensation of déjà vu in his writings, titled "The Psychology of the Future" (LiveScience, Ede). Déjà vu has been presented as a reminiscence of memories, "These experiments have led scientists to suspect that déjà vu is a memory phenomenon. We encounter a situation that is similar to an actual memory but we can’t fully recall that memory". This evidence, found by Émile Boirac, helps the public understand what déjà vu can entail on the average brain. It was also stated, ". . . Our brain recognizes the similarities between our current experience and one in the past . . . left with a feeling of familiarity that we can’t quite place" (Scientific American, Stierwalt). Throughout history, there have been many theories on what causes déjà vu. This phenomenon has displayed its difficulty to be tested due to its random occurrence in people.

 

Theories

Parallel Universe This theory claims that déjà vu can be explained by the feeling of having lived a moment before as a “crossover” with a parallel universe. Meaning, that whatever you’re doing while experiencing the déjà vu, a parallel version of you is doing it in a different universe simultaneously — creating an alignment between the two universes!

 

The Hologram This theory is the idea that our memories are formed like three-dimensional images. Which means that they have a structured frame network to them. This suggests that the entire formation of a memory can be reconstructed by one element. Therefore, if one stimulus in our environment reminds us of a previous moment we have experienced, our brain makes a connection to the past event and produces a “hologram” of the memory to make it feel like we are reliving it.

 

Precognitive Dreams This theory explains déjà vu by suggesting that the moment we have the experience of living something before, is when we have previously dreamed about the present happenings. For example, you may have a dream about riding your bike on a certain road, and then later you ride your bike on the same road as the one in your dream. You have a precognitive recollection of the road which allows you to recognize it. As dreaming is not a conscious process, this explains why we don’t consciously recognize the stimulus yet still feel that it is familiar — such as the road in this case.

 

 Reincarnation Reincarnation is based on having several lifetimes before we were born into this life, with no recollection of the previous ones. This theory explains the experience of déjà vu by referring to the moment as a signal from a previous life. There could be a trigger in the environment which allows the transition of consciousness to occur. Such as recognizing a certain stimulus from a previous existence and momentarily remembering a past life.