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Published on: July 24, 2010
Reduplicative paramnesia: longitudinal neurobehavioral and neuroimaging analysis
D J Moser1, R A Cohen, P F Malloy
1Department of Psychiatry and Human Behavior, Brown University School of Medicine, Providence, Rhode Island, USA.
Abstract:
Reduplicative paramnesia (RP) is a delusion in which the patient perceives familiar places, objects, or events to have been duplicated. The current case describes the development of RP in an 81-year-old male following a large right frontal lobe infarction. As the patient had been hospitalized previously with hemorrhagic contusions, neurologic, neuropsychological, and neuroimaging data were obtained both prior to and following RP onset. Psychophysiologic data were obtained following the development of the delusion. Both premorbidly and at follow-up, neuropsychological functioning was characterized by significant impairments of learning and memory and frontal-executive functions. Language and visuospatial skills and motor speed were intact both before and after RP onset. The case is described within the context of preexisting theories of RP, and it is surmised that the delusion is secondary to temporal-limbic-frontal dysfunction giving rise to a distorted sense of familiarity and impaired ability to resolve the delusion via reasoning.
Insights
Reduplicative paramnesia (RP), a delusion of duplicated places, developed in an 81-year-old male after a right frontal lobe infarction. This case highlights the link between frontal lobe damage and this rare neurological condition.
Area of Science:
- Neuroscience
- Neurology
- Psychiatry
Background:
- Reduplicative paramnesia (RP) is a rare delusion involving the perception of duplicated familiar entities.
- Understanding the neurological underpinnings of RP is crucial for diagnosis and treatment.
Observation:
- An 81-year-old male developed RP following a large right frontal lobe infarction.
- Neuropsychological assessments revealed significant impairments in learning, memory, and executive functions.
- Language, visuospatial skills, and motor speed remained intact.
Findings:
- The case suggests RP may stem from temporal-limbic-frontal dysfunction.
- This dysfunction likely causes a distorted sense of familiarity.
- Impaired reasoning contributes to the inability to resolve the delusion.
Implications:
- This case provides valuable insights into the neurobiology of reduplicative paramnesia.
- It underscores the role of frontal lobe integrity in maintaining reality testing.
- Further research into temporal-limbic-frontal networks could reveal new therapeutic targets.
