Buzz
The human mind is truly remarkable – there is still so much about it that remains a mystery. While science has documented bizarre phenomena, it still struggles to explain their origins. Although some of these occurrences are familiar to most of us, many others remain largely unexplored outside the field of psychology. Here’s a list of the top ten strange mental phenomena.
We’ve all experienced that strange sensation of déjà vu – the eerie feeling that what we’re saying or doing has already happened in the distant past, as if we’ve been surrounded by the same people, places, and events long ago. It's as though we suddenly recall what is about to happen next! — Charles Dickens
10. Déjà Vu
Déjà vu is the sensation of being absolutely sure that you’ve encountered or witnessed a new situation before – it feels as though the event has already occurred or is repeating itself. This experience is often paired with a deep sense of familiarity, alongside an eerie, strange, or uncanny feeling. The ‘previous’ experience is often linked to a dream, though at times, it feels like a genuine memory from the past.
9. Déjà Vécu
Déjà vécu (pronounced vay-koo) is the sensation many people experience when they think they are undergoing déjà vu. While déjà vu is the feeling of having seen something before, déjà vécu involves the sense of having relived an event in great detail – recalling specific smells, sounds, and moments. This is frequently coupled with a powerful sense of knowing exactly what will happen next. In my own encounters with this phenomenon, not only have I known what would come next, but I have been able to predict it to those around me – and been proven right. It’s an uncanny and unexplained experience.
8. Déjà Visité
Déjà visité is a rarer phenomenon, where one experiences an uncanny familiarity with a new place. For example, you might instinctively know your way around a new town or landscape, even though you've never been there before, and it seems impossible that you could have such knowledge. Déjà visité deals with spatial and geographical awareness, while déjà vécu is related to temporal events. Nathaniel Hawthorne described an experience of this in his book “Our Old Home,” where he visited a ruined castle and recognized its layout. He later traced the experience back to a poem by Alexander Pope he had read many years earlier, which had described the castle in great detail.
7. Déjà Senti
Déjà senti is the phenomenon of having a sense of ‘already feeling’ something. This is a purely mental experience, and it rarely stays in memory. As one person who experienced it put it: “What occupies my attention is something familiar, something I’ve felt before, though forgotten for a time. Now, it resurfaces with a sense of satisfaction, as if it had been sought after. This recollection is often triggered by another person’s voice, by my own thoughts spoken aloud, or by something I’m reading. I might say something like, ‘Oh yes—I see,’ or ‘Of course—I remember,’ but moments later, I can’t recall the words or the thought that triggered the memory. All I know is it feels like something I’ve experienced before in a similar odd state.”
Imagine the sensation of having just spoken, only to realize that you didn’t actually say a word.
6. Jamais Vu
Jamais vu (meaning 'never seen') refers to the experience of encountering a familiar situation, yet not recognizing it. It’s often considered the opposite of déjà vu and is accompanied by an unsettling feeling. The person does not recognize the situation, even though they logically know they have been there before. This phenomenon is commonly experienced when one momentarily forgets a person, word, or place that they know well. Chris Moulin from Leeds University conducted an experiment where 92 volunteers were asked to write the word 'door' 30 times in 60 seconds. He found that 68 percent of participants displayed symptoms of jamais vu, such as questioning whether 'door' was even a real word. This led Moulin to believe that jamais vu may be a sign of mental exhaustion.
5. Presque Vu
Presque vu is very similar to the sensation of having something on the ‘tip of the tongue’ – that strong feeling that you’re on the verge of a great revelation, though it rarely materializes. The term ‘presque vu’ translates to ‘almost seen.’ This feeling can be disorienting and distracting, as if you’re just about to grasp something profound but can’t quite catch it.
4. L’esprit de l’Escalier
L’esprit de l’escalier (literally ‘staircase wit’) is the sensation of coming up with a witty retort or clever comment too late – typically after you’ve already left the scene, often on the ‘staircase’ as you exit. This term can refer to a response to an insult or any smart remark that strikes your mind just after it would have been useful. The German word ‘treppenwitz’ captures the same idea. In English, this is most closely described by the phrase ‘being wise after the event.’ This phenomenon is often accompanied by regret for not thinking of the perfect response in the moment when it would have been most appropriate.
3. Prosopagnosia
Prosopagnosia refers to a condition where a person is unable to recognize familiar faces or objects they should know. Individuals with this disorder typically rely on their other senses to identify people, such as detecting their perfume, noting their hairstyle, listening to their voice, or even observing their gait. A well-known example of this disorder is described in the 1998 book (later turned into an opera by Michael Nyman) titled ‘The Man Who Mistook His Wife for a Hat.’
2. Fregoli Delusion
Fregoli delusion is a rare mental condition in which an individual believes that different people are actually the same person in disguise. This delusion is often paired with paranoia, with the individual feeling that the disguised person is out to persecute them. The condition takes its name from the Italian actor Leopoldo Fregoli, who was famous for his quick costume changes during performances. The first case of this phenomenon was documented in 1927, where a 27-year-old woman thought she was being stalked by two actors she frequently saw at the theater, convinced that these individuals were following her in different forms.
1. Capgras Delusion
Capgras delusion is a psychological phenomenon where a person is convinced that someone close to them, like a family member or friend, has been replaced by an identical imposter. This belief can be traced back to old folklore, which claimed that babies were switched with changelings, and has modern parallels in the idea that aliens might take over human bodies for unknown purposes. While this delusion is most commonly seen in individuals with schizophrenia, it can also occur in people with other mental health disorders.
