The term "Jamais vu" is used to describe any familiar situation which is not recognized by the observer. It is the opposite of "Deja vu".
In psychology, the term jamais vu (from the French, meaning "never seen") is used to describe any familiar situation which is not recognized by the observer. Often described as the opposite of deja vu, jamais vu involves a sense of eeriness and the observer's impression of seeing the situation for the first time, despite rationally knowing that he or she has been in the situation before.
Jamais vu is more commonly explained as when a person momentarily doesn't recognize a word, person, or place that he/she already knows.
The phenomenon is often grouped with deja vu and presque vu (together, the three are frequently referred to as "The Vus"). Jamais vu is sometimes associated with certain types of amnesia and epilepsy. With seizures, jamais vu can surface as an aura due to a partial seizure disorder that originates from the temporal lobe of the brain. It also can occur as a migraine aura.