Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan

Capgras Syndrome

  • Paul MalloyEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_1349


Reduplication delusion; Reduplicative paramnesia

Short Description or Definition

Delusions are defined as false beliefs based on incorrect inference about external reality and firmly sustained in spite of the opinions of others or contrary evidence (American Psychiatric Association 1987).

Capgras syndrome (Capgras and Reboul-Lachaux 1923) is a type of reduplication delusion involving the belief that persons well-known to the patient, such as family members, have identical doubles or are imposters. The double or imposter is sometimes perceived as differing slightly in some physical characteristic from the “genuine” person, but the patient may have difficulty verbalizing the precise nature of this “difference.”


Several variations of Capgras syndrome have been identified. Doppelganger or subjective double is the belief that the patient himself/herself has a double or impersonator (Christodoulou 1978). Fregoli syndromeis the belief that a person is capable of...

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References and Readings

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Psychiatry and Human BehaviorBrown UniversityProvidenceUSA