What causes a Deja Vu episode???

There are several possible explanations for what is occuring during a Deja Vu experience. One possibility is simply the occasional mismatch made by the brain in its continuous attempt to create whole sensical pictures out of very small pieces of information. Looking at memory as a hologram, only bits of sensory information are needed for the brain to reconstruct entire three-dimensional images. When the brain receives a small sensory input that is strikingly similar to such a detail experienced in the past, the entire memory image is brought forward. The brain has taken the past to be the present by virtue of one tiny bit of sensory information. This theory provides a satisfactory explanation for the physical effects of Deja Vu. These appear to be similar to the effects of mismatch between sensory input and corollary discharge signal information to the brain. Another explanation for Deja Vu is that there is a slight malfunctioning between the long and the short term memory circuits of the brain. When this new, recent piece of information is draw upon, the person thinks that the piece is coming from long-term storage and so must have come from the distant past. All of these neurobiologically based explanations for Deja Vu seem plausible and intriguing and perhaps there is some overlap or combination that accounts for the different experiences we call Deja Vu.