![]() ![]() In other words, those who had less gray matter volume in a certain region of the brain tended to experience déjà vu more frequently. It found that the volume was inversely correlated with the frequency of the phenomenon. One study compared gray matter volume in the brain between healthy subjects that did and did not experience déjà vu. Some various theories, connections, and findings include: ![]() In neurologically healthy individuals, the underlying causes are still unknown. People who experience focal seizures may suddenly feel an intense déjà vu before the seizures occur. ![]() In individuals with this condition, a sense of déjà vu may precede the onset of a seizure. In an academic review of research on the topic, a connection between frequent déjà vu and certain neurological conditions, such as temporal lobe epilepsy, has been made. These theories may involve different concepts ranging from reincarnation to unconscious memories. There are a few theories about the cause of déjà vu according to literature and cultural or religious traditions. The sudden feeling of familiarity during déjà vu could be linked to nerve cell activity in a healthy brain, as the brain processes new information and tries to connect it to existing memories. It typically occurs on an irregular basis, but déjà vu can leave some with such a strange sensation that they remember it for months or years. It’s not just a feeling of familiarity, but also the knowledge that the familiarity is false. This term is French for “already seen.” The dictionary definition is “a feeling of having already experienced the present situation.” Usually very brief and fleeting, this odd sense can feel unsettling and inexplicable because your brain is telling you that you recognize a place, scene, or event that you know is brand-new to you. While it’s fairly common, it occurs in some people more than others-and although it’s typically harmless, frequent experiences of it are associated with some neurological conditions. If you’ve ever thought, “I’ve done or seen this before,” in the middle of a new experience, it might have been the neurological phenomenon known as déjà vu. ![]()
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