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Spontaneous neural activity in the parahippocampal gyrus
According to this theory, the brain suffers a small seizure in the parahippocampal system, which is associated with spatial processing and our sense of familiarity.
Slowdown in the secondary visual pathway
It is well established that we process visual information through two pathways. One goes directly to the visual cortex, in the occipital lobe. The secondary pathway, which is infinitesimally slower, is routed through various other areas of the brain, notably the parietal cortex, on its way to the occipital lobe. Some researchers believe that a deja vu experience occurs when signals on the secondary pathway move too slowly, and the brain interprets this second wave of data as a separate experience.
Imagine that you drive through an unfamiliar town but pay it little attention because you are talking on a cellphone. If you then drive back down the same streets a few moments later, this time focusing on the landscape, you might be prone to experience deja vu. During your second pass, the visual information is consciously processed in the hippocampus but feels falsely "old" because the images from your earlier drive still linger in your short-term memory.
Originally posted by parker
One theory i have read about explains it this way. We have particules smaller than atoms that we produce during thought or in the memory part of our pineal gland called tachyons ,and these tachyons travel backward in time as well as forwards and it is these things we can pick up on in what would be the past to us.