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Delusional disorder, traditionally synonymous with paranoia, is a mental illness in which a person has delusions, but with no accompanying prominent hallucinations, thought disorder, mood disorder, or significant flattening of affect. [6] [7] Delusions are a specific symptom of psychosis.
The syndrome of subjective doubles is a rare delusional misidentification syndrome in which a person experiences the delusion that they have a double or Doppelgänger with the same appearance, but usually with different character traits, that is leading a life of its own.
Syndrome of delusional companions is the belief that objects (such as soft toys) are sentient beings. [10] Clonal pluralization of the self, where a person believes there are multiple copies of themselves, identical both physically and psychologically, but physically separate and distinct. [11]
Capgras delusion or Capgras syndrome is a psychiatric disorder in which a person holds a delusion that a friend, spouse, parent, other close family member, or pet has been replaced by an identical impostor. [a] It is named after Joseph Capgras (1873–1950), the French psychiatrist who first described the disorder.
Cotard's syndrome, also known as Cotard's delusion or walking corpse syndrome, is a rare mental disorder in which the affected person holds the delusional belief that they are dead, do not exist, are putrefying, or have lost their blood or internal organs. [1]
They state that persecutory type is a common delusion that includes the belief that the person or someone close to the person is being maliciously treated. This encompasses thoughts that oneself has been drugged, spied upon, harmed, mocked, cheated, conspired against, persecuted, harassed and so on and may procure justice by making reports ...
This syndrome is most commonly diagnosed when the two or more individuals of concern live in proximity, may be socially or physically isolated, and have little interaction with other people. Various sub-classifications of folie à deux have been proposed to describe how the delusional belief comes to be held by more than one person: [8] Folie ...
The syndrome may be related to a brain lesion [2] [3] and is often of a paranoid nature, with the delusional person believing themselves persecuted by the person they believe is in disguise. [4] A person with the Fregoli delusion may also inaccurately recall places, objects, and events. This disorder can be explained by "associative nodes".