An MRI, SPECT and Neuropsychological Study of a Patient Presenting with Capgras Syndrome

Mackie, J; Ebmeier, Klaus P.; O’Carroll, Ronan E.

doi:10.1155/1994/960953

Cited by 8 publications

(2 citation statements)

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“…described Ms. A who fatally stabbed and shot her mother following a five-year period of believing that her parents were impostors. There are also reported instances in which the delusion recurred intermittently over long periods of time, such as the young man described by Mackie, Ebmeier and O'Carroll (1994), who stated that several times each day his parents or close relatives would be replaced by an impostor, and that this had gone on continually throughout the past year. It would therefore appear that DM can be highly variable with regard to both stability and duration.…”

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confidence: 99%

Towards an Understanding of Delusions of Misidentification: Four Case Studies

et al. 2000

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Four detailed cases of delusions of misidentification (DM) are presented: two cases of misidentification of the reflected self, one of reverse intermetamorphosis, and one of reduplicative paramnesia. The cases are discussed in the context of three levels of interpretation: neurological, cognitive and phenomenological. The findings are compared to previous work with DM patients, particularly the work of Ellis and Young (1990;Young, 1998) who found that loss of the normal affective response to familiar faces was a contributing factor in the Capgras delusion. The four cases presented suggest that this particular deficit is not a critical factor in the development of other forms of DM.Delusions of misidentification (DM) include a variety of fascinating disorders in which there is a mistaken belief in the identity of oneself, other people, places or objects. They include: Capgras syndrome-the belief that other people, often close relatives, have been replaced by doubles or impostors; Fregoli syndrome-the belief that strangers are in fact known people in disguise; intermetamorphosis-the belief that someone has changed physically and psychologically into another person; reverse intermetamorphosis-the belief that there has been a physical and psychological change of oneself into another person; and reduplicative paramnesia-the belief that there are doubles of known people or places. This last delusion (reduplicative paramnesia) differs from Capgras delusion in that while reduplication is believed to have occurred, there is no sense of replacement. Thus, the impostor claim is not made in cases of reduplicative paramnesia. Patients with DM traverse the boundaries of psychiatry, neurology and neuropsychology and have been studied from the perspective of all three disciplines. 1 We are very grateful to TH, FE, DB, RZ and their families for their participation in this research. We would also like to thank Matthew Large for insightful discussion about the cases and referral of patient RZ, Virginia Arpadi for referring patient TH, David Sharpe for referring patient FE, and Robyn Langdon and Karalyn Patterson for helpful comments on an earlier draft of this paper.

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Towards an Understanding of Delusions of Misidentification: Four Case Studies

et al. 2000

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“…There are reports that delusions may come and go (Ellis, Luaute, & Retterstol, 1994;Mackie, Ebmeier, & O'Carroll, 1994), or even that they may change in content. For example, Wright, Young, and Hellawell (1993) describe a patient JH who experienced the Cotard delusion (the belief that he was dead) and the Capgras delusion in sequence.…”

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confidence: 99%

Confabulation and delusion: A common monitoring framework

Turner

Coltheart

2010

Cognitive Neuropsychiatry

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Confabulations and delusions both involve the production of false claims. Although they may have different types of content, they share several characteristics. For example, they are often held with considerable conviction and are resistant to counter evidence, they may be acted upon, and they may be accompanied by a lack of concern about the false claim or its implications. Confabulations and delusions may initially arise from failures in different systems (e.g., mnemonic vs. perceptual or affective). However, their shared characteristics raise the possibility that the monitoring deficits involved might be the same, resulting in failure to reject the confabulatory or delusional ideas. In this paper we will focus on the nature of these common monitoring deficits. Critically, we argue that monitoring in confabulation and delusion involves both unconscious and conscious processes. We propose that an unconscious process is responsible for tagging suspect content which needs to be checked for veracity by a separate set of conscious evaluative processes. Failure of these monitoring processes would allow ideas which ought to be checked and rejected to instead be uncritically accepted: This would result in the production of confabulations or delusions. Importantly, inclusion of both unconscious and conscious monitoring stages allows the model to account for both "endorsement" and "explanation" delusions, and both "primary" and "secondary" confabulations. Our hope is that this model may provide a theoretical framework to guide empirical investigation of the commonalities and differences between the conditions.

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A review of the phenomenology and cognitive neuropsychological origins of the Capgras syndrome

Edelstyn

Oyebode

1999

Int. J. Geriat. Psychiatry

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An MRI, SPECT and Neuropsychological Study of a Patient Presenting with Capgras Syndrome

Cited by 8 publications

References 10 publications

Towards an Understanding of Delusions of Misidentification: Four Case Studies

Towards an Understanding of Delusions of Misidentification: Four Case Studies

Confabulation and delusion: A common monitoring framework

A review of the phenomenology and cognitive neuropsychological origins of the Capgras syndrome

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