Abstract
BackgroundCapgras delusion is scientifically important but most commonly reported as single case studies. Studies analysing large clinical records databases focus on common disorders but none have investigated rare syndromes.AimsIdentify cases of Capgras delusion and associated psychopathology, demographics, cognitive function and neuropathology in light of existing models.MethodCombined computational data extraction and qualitative classification using 250 000 case records from South London and Maudsley Clinical Record Interactive Search (CRIS) database.ResultsWe identified 84 individuals and extracted diagnosis-matched comparison groups. Capgras was not ‘monothematic’ in the majority of cases. Most cases involved misidentified family members or close partners but others were misidentified in 25% of cases, contrary to dual-route face recognition models. Neuroimaging provided no evidence for predominantly right hemisphere damage. Individuals were ethnically diverse with a range of psychosis spectrum diagnoses.ConclusionsCapgras is more diverse than current models assume. Identification of rare syndromes complements existing ‘big data’ approaches in psychiatry.Declaration of interestsV.B. is supported by a Wellcome Trust Seed Award in Science (200589/Z/16/Z) and the UCLH NIHR Biomedical Research Centre. S.W. is supported by a Wellcome Trust Strategic Award (WT098455MA). Q.D. has received a grant from King’s Health Partners.Copyright and usage© The Royal College of Psychiatrists 2017. This is an open access article distributed under the terms of the Creative Commons Non-Commercial, No Derivatives (CC BY-NC-ND) license.
Highlights
Capgras delusion is scientifically important but most commonly reported as single case studies
Individuals were ethnically diverse with a range of psychosis spectrum diagnoses
Considering previously reported associations between Capgras delusion and dementia,[14] we examined the number of patients with Capgras at Case ID converted to dementia from other diagnoses
Summary
Capgras delusion is scientifically important but most commonly reported as single case studies. Studies analysing large clinical records databases focus on common disorders but none have investigated rare syndromes. Aims Identify cases of Capgras delusion and associated psychopathology, demographics, cognitive function and neuropathology in light of existing models. Method Combined computational data extraction and qualitative classification using 250 000 case records from South London and Maudsley Clinical Record Interactive Search (CRIS) database
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