Reduplication after right middle cerebral artery infarction.

Reduplication and misidentification syndromes are similar and peculiar phenomena of disorientation and beliefs with delusional qualities. They are more frequent among neurologic and psychiatric patients than previously thought. Organic factors play a definitive role in their occurrence. A case is presented which exemplifies reduplication of place and person, following a right hemisphere focal lesion. Current theories are briefly reviewed and possible roles of nortriptyline therapy and psychological factors are discussed in the pathogenesis of reduplicative phenomena in this patient.