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A mismatching in the brain can cause it to confuse the present with the past. If you look at the memory as a hologram, only bits of sensory information are needed for the brain to produce entire 3 dimensional images. When the brain receives a small sensory input (such as a sight, smell, or sound) that is really similar to something you have done in the past, the entire memory image is seen. The brain has taken the past to be the present from only one tiny bit of sensory information. For example, a single detail such as the sound of a child's voice or even the smell of perfume can trigger the exact same scene. In Time Magazine, Herman Sno, a psychiatrist from Amsterdam stated, "As a result of the mismatching the brain mistakes the present for the past, You feel certain you've seen the picture before." Professionals often mock the second cause of déjà vu. Some people believe individuals DNA may hold explanations for their déjà vu feeling. It is considered that specific memories of one's ancestors can be passed down in the genes of DNA. Therefore, a tiny part of every cell in the body could remember everything one's ancestors once experienced: anything from wars, to festivals, to births, plagues, beheadings, or historical locations. The present person could have actually been
