"Cat-gras" delusion: a unique misidentification syndrome and a novel explanation

Neurocase
R Ryan Darby, David Caplan

Abstract

ABSRACT Capgras syndrome is a distressing delusion found in a variety of neurological and psychiatric diseases where a patient believes that a family member, friend, or loved one has been replaced by an imposter. Patients recognize the physical resemblance of a familiar acquaintance but feel that the identity of that person is no longer the same. Here we describe a 73-year-old male with right posterior frontal and bilateral anterior-medial frontal damage from prior brain trauma with a similar delusion of an imposter replacing his pet cat. Misidentification syndromes for animals, as opposed to humans, have been rarely reported. Neuropsychological testing showed deficits in executive processing and memory retrieval with prominent intrusions and false positive responses. The delusional belief content in Capgras syndrome has been hypothesized to result from loss of an emotional or autonomic response to familiar stimuli, from theory of mind deficits, or from loss of self-environment distinctions. We instead propose that Capgras delusions result from a dysfunction in linking external stimuli with retrieved internal autobiographical memories pertaining to that object. This leads to an erroneously learned identity that persists as a sp...Continue Reading

References

Aug 1, 1990·The British Journal of Psychiatry : the Journal of Mental Science·H D Ellis, A W Young
Apr 1, 1982·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·R D StatonH Wilson
Jul 22, 1997·Proceedings. Biological Sciences·H D EllisK W De Pauw
May 7, 1999·Journal of Geriatric Psychiatry and Neurology·D J MoserJ M Rogg
Aug 22, 2001·The Journal of Neuropsychiatry and Clinical Neurosciences·A RöSLERE Seifritz
Mar 12, 2003·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Anna Stone, Tim Valentine
Jul 27, 2007·The Quarterly Journal of Experimental Psychology : QJEP·Max Coltheart
Mar 4, 2008·Consciousness and Cognition·Garry Young
Jun 10, 2008·Consciousness and Cognition·Alison L MorrisMary L Still
Dec 18, 2009·Cognitive Neuropsychiatry·William Hirstein
Apr 16, 2010·Annals of the New York Academy of Sciences·Max Coltheart
Jun 19, 2010·Progress in Neurobiology·P R CorlettJ H Krystal
Oct 19, 2010·Consciousness and Cognition·Todd E Feinberg
Oct 1, 1995·Journal of Cognitive Neuroscience·D TranelA R Damasio
Jan 15, 2014·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Christiane M ThielRiklef Weerda
Jun 18, 2014·Neuropsychologia·Jessica A Collins, Ingrid R Olson

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Citations

Oct 27, 2016·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Pedro Nascimento AlvesIsabel Pavão Martins
Nov 22, 2017·Cognitive Neuropsychiatry·Peter CluttonColin Klein
Nov 16, 2018·Frontiers in Psychology·Charles C-H HongJames C Harris
Apr 17, 2019·Cognitive Neuropsychiatry·R Ryan Darby
Jul 11, 2020·The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry·Shokouh ArjmandMohammad Shabani
Jan 14, 2017·Brain : a Journal of Neurology·R Ryan DarbyMichael D Fox
Apr 6, 2019·Neuropsychologia·Matthias G TholenJosef Perner
Jul 7, 2021·Revista colombiana de psiquiatría·Marta Migoya-BorjaEnrique Baca-García
Dec 11, 2021·Cognitive Neuropsychiatry·Max Coltheart, Martin Davies

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