Prevalence and correlates of Capgras syndrome in Alzheimer's disease
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Updated: Oct 19, 2026

Application of Granger Causality Analysis of the Directed Functional Connection in Alzheimer's Disease and Mild Cognitive Impairment
Published on: August 7, 2017
D G Harwood1, W W Barker, R L Ownby
1Wien Center for Alzheimer's Disease and Memory Disorders, Mount Sinai Medical Center and the University of Miami School of Medicine, Miami Beach, FL 33140, USA.
Objectives:
This study examined the prevalence and clinical correlates of Capgras syndrome (CS) in Alzheimer's disease.
Design:
Cross-sectional study of elderly patients evaluated at an outpatient memory disorders clinic classified according to the presence or absence of CS.
Subjects:
One hundred and fifty-one consecutive patients diagnosed with probable (N=110) or possible (N=48) Alzheimer's disease (AD) utilizing NINCDS-ADRDA diagnostic criteria.
Materials:
The Behavioral Pathology in Alzheimer's Disease Rating Scale (BEHAVE-AD), Mini-Mental State Examination (MMSE) and Blessed Dementia Scale (BDS).
Results:
CS was observed in 10% of the sample (N=16). Associated factors included other delusions, lower MMSE scores and higher BDS scores. The relation between CS and both cognitive and functional status remained significant after controlling for other delusions.
Conclusion:
CS was prevalent in approximately 10% of our community-dwelling AD sample. This syndrome was more common at the later stages of the illness and showed relations with increased functional impairment and other psychotic symptomatology.
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