The term "reduplicative paramnesia" refers to the disorder in which the false conviction arises in a person's mind that a place that is familiar to the patient exists in more than one physical location . For example, the patient may insist that the hospital to which he is admitted has been duplicated and relocated, and that both coexist at the same time, with the same name, identical, and with the same people. This creates a kind of "parallel worlds" feeling.
The first case was discovered in 1903 by the neurologist Arnold Pick. Scientists have found that it usually occurs several months after a brain injury.
