Psychoanalysts relate déjà vu to wish fulfilment or fantasy, whereas, psychiatrists claim déjà vu to a mismatching of the brain cells that causes to the brain to mistake present as past. Scientific American exclaimed that brain suffers small seizures that are responsible for memory formation which could be the reason for some things to suddenly feel familiar. Déjà vu cases are mostly said to be suffered by epilepsy patients where electrical stimulations and dysfunctional electrical discharge takes place in the brain, but these discharges can occur in non-pathological manner too in people without epilepsy.Researchers are once in a while ready to record straightforwardly from the brains of individuals with epilepsy—they have more motivations to experience neurosurgery, all things considered—we’ve possessed the capacity to figure out which parts of the cerebrum are related with this feels familiar. In the late 1950s, scientists found through electrical incitement and recording of seizures that the fleeting neocortex was essentially included. In the late 1970s, it was demonstrated that you could incite a sensation that this has happened before through cathodes in the average fleeting flap, and later work has found with much greater specificity which parts of the average transient projection are related with this feels familiar.
Déjà vu when in healthy patients is reported as memory error where it occurs due to discrepancy in memory system which means that information that is supposed to be a part of short-term memory instead reaches long-term memory. It is caused by mismatch between sensory input and the memory recalling output which explains why people feel familiar to a new experience, but not as familiar as a fully recalled memory. Even though the coverage in popular culture is very vast, experiences or familiarity of déjà vu is very poorly understood in scientific terms. There are more theories that exist regarding déjà vu such as paranormal past lives, alien abduction and precognition dreams.