Reduplicative paramnesia is a delusion in which patients believe familiar places, objects, individuals or events to be duplicated. The syndrome is probably heterogeneous and bears some resemblance to the Capgras delusion as described by psychiatrists.
Reduplicative paramnesia is commoner with right (nondominant) hemisphere damage; frontal, temporal and limbic system damage has been implicated. This may occur transiently as a consequence of cerebrovascular disease, following head trauma, or even after migraine attacks, or more persistently in the context of neurodegenerative disorders, such as Alzheimer’s disease.
Benson DF, Gardner H, Meadows JC. Reduplicative paramnesia.
Neurology 1976; 26: 147-151