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Are reduplicative paramnesia and clonal pluralization overlapping constructs?

Following the early description of delusion of doubles by Capgras and Reboul-Lachaux (1923), several variants of delusional misidentification syndrome (DMS) have been described in literature. The major DMSs besides Capgras syndrome include delusions of Fregoli (Courbon & Fail 1927), subjective doubles (Courbon & Tusques 1932) and intermetamorphosis (Christodoulou 1978). Murai et al. (1998) distinguished DMS into two major groups: the Capgras’ type (including Fregoli delusion) and the Clonal Pluralization (CP) type. The former involves misidentification in the true sense, while the later stems from a false belief that multiple copies of an individual exist who are physiologically and psychologically identical. Following the first description of such a case of clonal pluralization of a person (Murai et al. 1998), Voros et al. (2003) described a case of CP of self, and Ranjan et al. (2007) expanded it to include a case of CP of self and others. Nagy et al. (2009) described a case of CP of self as a hallucinatory form of autoscopy. Reduplicative paramnesia (RP), another related concept, has primarily been used to refer to “duplication” of a place and has mostly been described in relation to neurologic illnesses (Politis & Loane 2012) though the original description by Pick (1903) bore a striking phenomenological resemblance to cases of CP described in literature. We describe a case of paranoid schizophrenia where the person believed in the existence of several copies of him as well as others and also claimed that the vegetation in the hospital was identical to that of his house.