delusional misidentification
False belief about the identity of familiar people, places, or objects, commonly seen in dementia and psychiatric conditions.
Full Definition
Delusional misidentification refers to a group of delusional beliefs involving false recognition or misidentification of familiar people, places, objects, or events. Common subtypes include Capgras syndrome (belief that familiar people have been replaced by impostors), Fregoli syndrome (belief that strangers are familiar people in disguise), and reduplicative paramnesia (belief that places have been duplicated). These phenomena are frequently observed in dementia, particularly with Lewy bodies, as well as in various psychiatric and neurological conditions. The misidentifications represent complex disruptions in recognition and memory processes rather than simple perceptual errors. Clinical documentation should specify the type of misidentification and associated functional impact.
Usage
Usage note: Specify the subtype when known; distinguish from simple confusion or hallucinations.
In Context
- "The patient exhibited delusional misidentification, insisting that her daughter was an impostor despite intact visual recognition." — Neuropsychiatric assessment
- "Delusional misidentification syndromes were documented as part of the patient's complex dementia presentation." — Diagnostic formulation