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Delusional misidentification involving the self.

J R Kamanitz1, R S el-Mallakh, A Tasman

  • 1Department of Psychiatry, University of Connecticut Health Center, Farmington.

The Journal of Nervous and Mental Disease
|November 1, 1989
PubMed
Summary
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Delusional misidentification syndromes include subjective doubles and Capgras syndrome. Capgras syndrome, when involving self-delusion, also presents with duplication delusions of others and places.

Area of Science:

  • Neurology
  • Psychiatry
  • Delusional Disorders

Background:

  • Delusional misidentification syndromes are characterized by misidentification of familiar people, places, or objects.
  • Two specific syndromes involve the delusion of doubles: subjective doubles and Capgras syndrome.

Observation:

  • The syndrome of subjective doubles features a sole delusion of a self-double.
  • In Capgras syndrome, a self-double delusion is rare but, when present, is accompanied by delusions of duplicated others and sometimes places.

Findings:

  • A review of cases since 1900 reveals varied presentations of self-double delusions within Capgras syndrome.
  • The co-occurrence of self-replacement with duplication delusions of external entities is a key differentiator.

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Implications:

  • Understanding these distinct presentations aids in diagnosing and differentiating delusional misidentification syndromes.
  • Further research into the neurobiological underpinnings of these specific delusional patterns is warranted.