More research is underway to investigate additional possible factors at play in this mysterious phenomenon.
Very likely, many factors can contribute to what makes a scene or a situation feel familiar. However, it does not mean that spatial resemblance is the only cause of déjà vu. This research suggests that one contributing factor to déjà vu can be spatial resemblance of a new scene to one in memory that fails to be consciously called to mind at the moment. As predicted, déjà vu was more likely to happen when people were in a scene that contained the same spatial arrangement of elements as an earlier scene they viewed but didn’t recall. That way we could manipulate the environments people found themselves in – some scenes shared the same spatial layout while otherwise being distinct. To investigate this idea in the laboratory, my team used virtual reality to place people within scenes. According to the Gestalt familiarity hypothesis, if that previous situation with a similar layout to the current one doesn’t come to mind, you might be left only with a strong feeling of familiarity for the current one. Maybe the way the nursing station is situated – the furniture, the items on the counter, the way it connects to the corners of the hallway – is the same as how a set of welcome tables was arranged relative to signs and furniture in a hallway at the entrance to a school event you attended a year earlier. The underlying cause for this experience of déjà vu could be that the layout of the scene, including the placement of the furniture and the particular objects within the space, have the same layout as a different scene that you did experience in the past. Although you’ve never been to this hospital before, you are struck with a feeling that you have. FS Productions/Tetra images via Getty Imagesįor example, imagine you’re passing the nursing station in a hospital unit on your way to visit a sick friend.
Maybe the layout of a new place is very similar to somewhere else you’ve been, but that you aren’t consciously remembering. Psychologists called this the Gestalt familiarity hypothesis. We investigated a near century-old hypothesis that suggested déjà vu can happen when there’s a spatial resemblance between a current scene and an unrecalled scene in your memory. Prompted by Brown’s work, my own research team began conducting experiments aimed at testing hypotheses about possible mechanisms of déjà vu. His work served as a catalyst for scientists to design experiments to investigate déjà vu.
He also reported on hints throughout a century or so of medical literature of a possible association between déjà vu and some types of seizure activity in the brain.īrown’s review brought the topic of déjà vu into the realm of more mainstream science, because it appeared in both a scientific journal that scientists who study cognition tend to read, and also in a book aimed at scientists.
He determined that the most common trigger of déjà vu is a scene or place, and the next most common trigger is a conversation. From all these papers, Brown was able to glean some basic findings on the déjà vu phenomenon.įor example, Brown determined that roughly two thirds of people experience déjà vu at some point in their lives. But he also found studies that surveyed regular people about their déjà vu experiences. Much of what he could find had a paranormal flavor, having to do with the supernatural – things like past lives or psychic abilities. Moving from the paranormal to the scientificĮarly in this millennium, a scientist named Alan Brown decided to conduct a review of everything researchers had written about déjà vu until that point.
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