- misidentification syndrome
- Also known as delusional misidentification syndrome. Both terms are used as an umbrella term for a diverse group of conditions in which the affected individual consistently misidentifies a person, object, place, or event. The symptoms and syndromes included in the misiden-tification syndrome tend to vary somewhat in different classifications. Four subtypes are commonly distinguished, i.e. the * phantom boarder syndrome (which involves the imagined or hallucinated presence of one or more persons in the home of the affected individual); *mirrored self-misidentification (i.e. the inability to recognize oneself in a reflecting surface); misidentification of other persons (as in prosopagnosia, *intermetamorphosis syndrome, * Capgras' syndrome, *Frégoli's phenomenon, and the * syndrome of subjective doubles); and the *TV sign (in which the affected individual imagines the events on television as occurring in external, three-dimensional space). Other syndromes included under the heading misidentification syndrome are the * magazine sign (in which people or objects in magazines are treated as if they were present in the affected individual's home), the * picture sign (in which persons depicted in portraits are treated as present in the individual's home), the syndrome of subjective doubles (in which the affected individual believes that he or she has a *doppelgänger or * double living a separate life), clonal pluralization of the self (in which the affected individual believes that multiple copies of himself or herself exist, which are identical both physically and psychologically), reduplicative paramnesia (involving the conviction that a familiar person, place, or object has been duplicated), and the syndrome ofdelusional companions (i.e. the belief that toys or other objects are sentient beings). Misidentification syndromes are traditionally associated with psychiatric disorders such as *psychotic and affective disorders, but also with organic brain conditions such as viral encephalitis, Alzheimer's disease, and other types of dementia. Although they may occur in the absence of any demonstrable pathology ofthe brain, it has long been suspected that disorders belonging to the misidentifica-tion syndrome must have discrete neuroanatom-ical correlates, tentatively located in the right hemisphere. Evidence emerging from neuroimag-ing studies indicates that various discrete brain regions do indeed play a key role in their mediation. These candidate regions include the right fusiform gyrus (believed to play a major role in the identification of faces), the parahippocampal place area (believed to play a similar role in the identification of places), and the anterior middle and inferior temporal gyri (associated with long-term memory and mechanisms for the retrieval of memorized information). In some classifications, conditions characterized by misidentifica-tion as well as reduplication are referred to as delusional reduplication syndromes. It is open to debate whether these two groups of conditions are worthy of the predicate 'syndrome'. They are more like umbrella terms for a group of separate symptom clusters which have as their common denominator the fact that they lie on a continuum of anomalies of familiarity. It is equally open to debate whether these separate syndromes are primarily illusory or delusional in nature. In psychiatric classifications they tend to be relegated to the group of monothematic delusions. And yet in some instances, hallucinatory or at least illusory perception would seem to play a role. As early as 1866, the German psychiatrist Karl Ludwig Kahlbaum (1828-1899) described various misidentification syndromes, which he designated as Sinnesdelirien (i.e. * delirium of the senses) and which he relegated to the class of * illusions. Conversely, the German psychiatrist and neurologist Arnold Pick (1851-1924), whose concept of reduplicative paramnesia signalled a growing interest in cases of misidentification around the fin de siècle, regarded them as disorders ofmemory.ReferencesBurns, A. (1997). Misidentifications. International Psychogeriatrics, 8, 393-397.Feinberg, T.E., Deluca, J., Giacino, J.T., Roane, D.M., Solms, M. (2005). Right-hemisphere pathology and the self: Delusional misidentification and reduplication. In: The lost self. Pathologies ofthe brain and identity. Edited by Feinberg, T.E., Keenan, J.P. Oxford: Oxford University Press.Förstl, H., Almeida, O.P., Owen, A.M., Burns, A., Howard, R. (1991). Psychiatric, neurological and medical aspects of misidentification syndromes: A review of 260 cases. Psychological Medicine, 21, 905-910.Hudson, A.J., Grace, G.M. (2000). Misidentification syndromes related to face specific area in the fusiform gyrus. Journal of Neurology, Neurosurgery and Psychiatry, 69, 645-648.Pick, A. (1903). Clinical studies. Brain, 26, 242-267.
Dictionary of Hallucinations. J.D. Blom. 2010.
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Delusional misidentification syndrome — is an umbrella term, introduced by Christodoulou (book The Delusional Misidentification Syndromes , Karger, Basel,1986) for a group of delusional disorders that occur in the context of mental or neurological illness. They all involve a belief… … Wikipedia
delusional misidentification syndrome — see misidentification syndrome … Dictionary of Hallucinations
syndrome of subjective doubles — Also referred to as syndrome of doubles of the self. Both terms were introduced in or shortly before 1978 by the Greek psychiatrist George N. Christodoulou to denote a subgroup of the *misidentification syndrome in which the affected… … Dictionary of Hallucinations
Syndrome of subjective doubles — The syndrome of subjective doubles is a rare delusional misidentification syndrome in which a person suffers from the delusion that he or she has a double or doppelganger with the same appearance, but usually with different character traits and… … Wikipedia
Capgras' syndrome — Also known as Capgras syndrome, Capgras syndrome for persons, Capgras delusion, illusion des sosies, illusion of doubles, and illusion of false recognition. The eponym Capgras syndrome refers to the French psychiatrist Jean Marie Joseph… … Dictionary of Hallucinations
Mirrored self-misidentification — is the delusional belief that one s reflection in a mirror is some other person (often believed to be someone who is following them around). Often people who suffer from this delusion are not delusional about anything else. It is considered to be … Wikipedia
Mirrored-self misidentification — is the delusional belief that one s reflection in a mirror is some other person (often believed to be someone who is following one around). Often people who suffer from this delusion are not delusional about anything else. It is considered a… … Wikipedia
phantom boarder syndrome — (PBS) Also known as phantom boarder symptom. The expression phantom boarder symptom was introduced in or shortly before 1984 by the American psychiatrist and sex therapist Edward L. Rowan to denote a delusional syndrome involving the belief… … Dictionary of Hallucinations
intermetamorphosis syndrome — The term intermetamorphosis syndrome is indebted to the Latin inter (between) and the Greek metamorphoun (to change one s shape). It is used to denote a subgroup of the misidentification syndrome which is characterized by the conviction that… … Dictionary of Hallucinations
mirrored self-misidentification — A term that refers to a misidentification syndrome in which the affected individual is unable to identify his or her mirror image as oneself. The concomitant staring behaviour in front of a mirror or other reflecting surface is referred to as… … Dictionary of Hallucinations