This fits well with the fact that teenagers and young adults have déjà vu more frequently than older people. The brain just misfires a little and that causes the sensation. It’s possible that déjà vu in people without epilepsy is caused by some kind of seizure-like activity as well. People with epilepsy are known to have frequent déjà vu experiences. When you look up and see the coffee shop, you have the weird feeling that you’ve seen it before - because you just did, even though you have no conscious memory of it.Īnother theory is that déjà vu is caused by mini seizures. The information was processed at some level, just not fully. You glanced at the shop, but about that time got a text and looked away, so you didn’t fully register it. Imagine you were walking down the street and passed a new coffee shop. In the case of her research, it’s the spatial similarity, rather than any specific details, that triggers the feeling of familiarity.Īnother popular theory is that déjà vu is caused by a timing mismatch or interruption to your ongoing stream of processing of a current situation. This view is supported by Cleary’s VR experiments. So, in the scenario at your friend’s apartment, the space seems intensely familiar because you have been in a very similar apartment before you just don’t remember it. When you come across something similar, you recognize the familiarity but can’t call up the memory. This would be a situation where you experienced something, but cannot consciously recall it. One hypothesis is that déjà vu is a problem with memory. Once déjà vu research was taken seriously, lots of theories began to emerge about what goes on in the brain during a déjà vu experience. The subjects experienced déjà vu when a scene was similar to one they’d seen before, indicating that a similarity in spatial layout between two places might lead to a déjà vu-like sense of familiarity in a novel place. Cleary and her team took subjects through a series of scenes in the Sims video game, carefully designed so that the spatial layout of one scene was similar to another, even though the actual images were quite different. She used virtual reality to trigger déjà vu. Anne Cleary, professor of cognitive psychology and memory researcher at Colorado State University, had a more high-tech idea. In 2006, a team in England hypnotized subjects to induce déjà vu. Still, researchers have come up with novel ways to study it in the wild. Much that is known about déjà vu is based on surveys. The experience typically lasts no more than a few seconds and there’s no warning of when it’s about to happen, making it extremely difficult to study. In addition to the paranormal associations, déjà vu has presented another hurdle for researchers. Since then, he and a handful of researchers have ushered the study of déjà vu into mainstream science. In essence, his groundwork set the stage for the research community to take a closer look at the phenomenon in the years to come. In 2003, psychologist Alan Brown published a paper in the journal Psychological Bulletin that reviewed what little was known about déjà vu and connected that information to the existing paradigms in cognitive psychology and memory research. It’s not hard to understand why déjà vu got a reputation for being a little woo-woo and supernatural. And of course, there’s the modern Hollywood-hatched idea that déjà vu results from a glitch in the Matrix. Plato described something similar to déjà vu as evidence of past lives. Carl Jung thought the experience was related to the collective unconscious. Sigmund Freud looked at déjà vu and saw repressed desires. Over the centuries, humans often took déjà vu as evidence of what they already believed. But people had the experience long before it had a name. The French term déjà vu, which translates into English as “already seen,” was coined in 1876 by French philosopher and psychical researcher Émile Boirac. Experts estimate roughly two out of three people have had the experience at least once. Still, the feeling may be so intense - and so real - that you almost know what you’ll find when you walk into the kitchen. This is the first time you’ve ever visited this city. You visit a friend’s apartment and have the overwhelming sense you’ve been here before, but that can’t be the case. Déjà vu is the peculiar feeling that you’ve experienced something before, while at the same time knowing that you haven’t. If you have the peculiar feeling you've read this before, don't be alarmed.
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