Why Déjà Vu Feels Like You Remember Something That Never Happened
Déjà vu is a strange little failure of confidence.
You know the current situation is new. At the same time, another part of your mind insists that it is familiar. Not similar. Familiar. For a few seconds, reality seems repeated.
The French phrase means "already seen," although the experience does not have to involve vision alone. A conversation can feel repeated. A location can. A sequence of events can produce the unsettling impression that you know what comes next.
One broad explanation is that déjà vu results when the brain's familiarity system and its recollection system temporarily disagree.
Memory is not a single process.
You can recognise that something feels familiar without remembering where you encountered it. Normally these systems cooperate. You see a person, recognise them and retrieve the context.
Sometimes familiarity arrives without a usable source.
That creates an odd mental state. "This has happened before." "When?" "No idea."
The brain then attempts to solve the discrepancy.
Sometimes the current scene may resemble an older experience structurally without resembling it obviously. The arrangement of a room, a combination of objects or the rhythm of an interaction could partially match an earlier memory that you cannot consciously retrieve.
The sense of familiarity survives even though its source does not.
Déjà vu is common enough that it is not generally considered paranormal or pathological by itself. It has also been studied in neurological conditions, particularly temporal-lobe epilepsy, where unusually intense forms can occur around seizures.
For most people, however, it arrives occasionally, lasts briefly and disappears.
Which is almost disappointing.
For several seconds, your brain creates the sensation that time has folded, a previous life has leaked through or reality has accidentally loaded the same scene twice.
Then the ordinary memory system resumes operations.
No glitch in the Matrix. Just a glitch in the librarian.