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Deja vu
Déjà-vu (French expression meaning "already seen") is the subjective experience of perceiving as "already happened" an event that is in fact occurring for the first time. It is a common phenomenon: about two thirds of people experience it at least once. Psychology and neurology study its causes.
Scientific explanations
The most widely accepted hypotheses regard déjà-vu as an effect of neural micro-asynchrony: a momentary processing that erroneously labels the ongoing experience as "memory". Other hypotheses involve implicit familiarity (you were exposed to a similar stimulus in the past without remembering it). Frequency is higher in young people, in states of tiredness or stress, and in some temporal lobe epilepsies.
Esoteric readings
In esoteric and reincarnationist traditions, déjà-vu is interpreted as a trace of a past life or of a forgotten premonitory dream. There is no scientific evidence for these interpretations: they remain symbolic frameworks for those who find them meaningful.
FAQ
Is it normal?
Yes. About 60-80% of people experience it at least once. It is more common between the ages of 15 and 25.
Is it a symptom to treat?
Usually not. Only when it occurs very frequently or is accompanied by other symptoms (loss of consciousness, for example) can it indicate a neurological condition.
Is it linked to past lives?
It is in some esoteric traditions. Science explains it as a momentary brain phenomenon.