[Curiosities] Déjà vu: what does science say and what are the curiosities of this phenomenon?

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It is a feeling of repeating an experience already lived at another time.

A 'Déjà vu' is simply a memory of the future

 

The term déjà vu, which became French for 'already seen', was named by French researcher Émile Boirac in his book L'Avenir des sciences psychiques (The Future of Psychic Sciences).

According to an article published in the magazine of the Educar Association, an online platform that specializes in neuroscientific courses and publications, déjà vu or paramnesia is a psychological reaction that the brain transmits to the person who has been in the place where you are without perhaps having ever been.

 

(Illustrative image). People experienced a "déjà vu", that strange sensation that warns that this moment has already been lived before.
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According to experts, it is said that this sensation lasts between 10 and 30 seconds and has an unpredictable and fleeting nature that is related to the process of memory and human consciousness.

 

What does science say about this phenomenon?
There are currently several theories, on the neuroscience side, that try to explain this phenomenon. Among those that are, is the proposal of Alan S. Brown, counselor at the Southern Methodist University in Dallas, United States.

The psychologist and also author of the book The Déjà vu Experience, shows a classification of the various scientific investigations in relation to 'déjà vu'. These son:

1. Double processing
The central idea of this explanation is the sustaining of 'déjà vu' as a result of two synchronized parallel cognitive processes that momentarily lose resolution.

Said asynchrony may be due to the absence of one process when the other is activated or to the fact that the brain is encoding the information and retrieving it at the same time, that is, two related pathways that are normally separated are merging.

2. Neurological
The 'déjà vu' is an episode produced due to a brief dysfunction or interruption in a circuit of the temporal cortex, involved in the experience of remembering lived situations.

This fact generates a “false memory” of the situation. This theory has been justified with the study of patients with epilepsy of the temporal cortex, who often experience déjà vu just before suffering one of their attacks.

By measuring neural discharges in the brains of those patients, scientists have been able to identify the brain regions where déjà vu signals begin and how stimulating those same regions can produce that sensation.

 

According to some investigations, 'déjà vu' are frequent in people who are sometimes in a very extreme situation of stress and exhaustion.
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3. Mnemic
He defines 'déjà vu' as an experience because of the similarities and overlaps between past and present experiences.

The psychologist Anne M. Cleary, a researcher of the neural bases underlying 'déjà vu', postulates this phenomenon as a normal metacognitive mechanism that occurs when a past experience bears a resemblance to the present and, consequently, makes us believe that we already we have been there.

4. Double perception or attention
It is said that the phenomenon is produced as a consequence of a momentary distraction of the brain just after part of the scene has been captured.

 

When this attention is resumed and a complete capture is made, a strong sense of familiarity is attributed to that scene without being aware of its origin, giving a sensation of "false memory", since it had been implicitly and unconsciously registered.

The curiosities of déjà vu
Approximately two out of three people have experienced this phenomenon at some point in their lives.-The incidence of 'déjà vu' decreases with age.
It is more common in people who travel and who have quite liberal beliefs, whether political or religious.
People experience this phenomenon mainly when they are doing relaxing activities and in the company of friends, although an earlier stage of fatigue or stress precedes the phenomenon.-Its duration itself is relatively short, lasting around 10 to 30 seconds and is more frequent in the evenings than in the mornings and during the weekends.
14% of people report that they have experienced this phenomenon only once or twice in their life, 19% three or four times, 23% five to eight times and 44% nine or more times.
Some data conclude that this phenomenon is more common among schizophrenics than in normal people, although in them the experience can last several minutes or hours.-Although people's emotional reactions to this phenomenon are diverse, they are generally positive and show curiosity osurprise.
The phenomenon has been the center of scientific attention since 1800, presenting more than 30 different explanations for it.
The term began to be used at the end of the 1800s, although the exact date has not been specified and its use did not become po[CENSORED]r until decades later.

 

Link: https://www.lanacion.com.ar/lifestyle/deja-vu-que-dice-la-ciencia-y-cuales-son-las-curiosidades-de-este-fenomeno-nid19042023/