Delusion of inanimate doubles: Description of a case of focal retrograde amnesia

Carlo Abbate, Pietrovide Davide Trimarchi, Gian Pietro Salvi, Anna Maria Quarenghi, Carlo Vergani, Claudio Luzzatti

Research output: Contribution to journalArticlepeer-review


This paper reports the case of a patient, M.P., who developed delusion of inanimate doubles, without Capgras syndrome, after traumatic brain injury. His delusional symptoms were studied longitudinally and the cognitive impairments associated with delusion were investigated. Data suggest that M.P. did 'perceive' the actual differences between doubles and originals rather than 'confabulate' them. The cognitive profile, characterized by retrograde episodic amnesia, but neither object processing impairment nor confabulations, supports this hypothesis. The study examines the nature of object misidentification based on Ellis' and Staton's account and proposes a new account based on concurrent unbiased retrieval of semantic memory traces and biased recollection of episodic memory traces.

Original languageEnglish
Pages (from-to)457-477
Number of pages21
Issue number6
Publication statusPublished - Dec 2012


  • Capgras
  • Delusion of inanimate doubles
  • Misidentification of inanimate objects
  • Misidentification syndrome
  • Retrograde amnesia

ASJC Scopus subject areas

  • Clinical Neurology
  • Arts and Humanities (miscellaneous)


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