Delusional Misidentification Syndromes

Ellis, Hadyn D.; Luauté, Jean-Pierre; Retterstøl, N

doi:10.1159/000284856

Cited by 52 publications

(32 citation statements)

References 12 publications

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“…In the former, observers can 26 identify familiar faces but do not exhibit the appropriate corresponding feelings of familiarity and related skin conductance responses. As a consequence, people with Capgras delusion believe that familiar persons have been replaced by impostors or aliens (Ellis, 1997). Prosopagnosic observers, on the other hand, are impaired in overt recognition but can still exhibit arousal responses to familiar faces (see, e.g., Ellis, Quayle, & Young, 1999).…”

Section: Discussionmentioning

confidence: 99%

Can Gaze-Contingent Mirror-Feedback from Unfamiliar Faces alter Self-Recognition?

Estudillo

Bindemann

2017

Quarterly Journal of Experimental Psychology

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This study focuses on learning of the self, by examining how human observers update internal representations of their own face. For this purpose, we present a novel gazecontingent paradigm, in which an onscreen face either mimics observersÕ own eye-gaze behaviour (in the congruent condition), moves its eyes in different directions to that of the observers (incongruent condition), or remains static and unresponsive (neutral condition). Across three experiments, the mimicry of the onscreen face did not affect observersÕ perceptual self-representations. However, this paradigm influenced observersÕ reports of their own face. This effect was such that observers felt the onscreen face to be their own and that, if the onscreen gaze had moved on its own accord, observers expected their own eyes to move too. The theoretical implications of these findings are discussed.3

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Section: Discussionmentioning

confidence: 99%

Can Gaze-Contingent Mirror-Feedback from Unfamiliar Faces alter Self-Recognition?

Estudillo

Bindemann

2017

Quarterly Journal of Experimental Psychology

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“…This is an intriguing finding, as misidentification syndromes, such as Capgras and Fregoli delusions, are dramatic -albeit rare -clinical phenomena in schizophrenia (Ellis et al, 1994;Feinberg and Roane, 2005). Little is known about the neurophysiological origins of misidentification syndromes, but it has been suggested that impaired visual processing may contribute to their etiology (Phillips and David, 1995).…”

Section: Discussionmentioning

confidence: 99%

Facial emotion recognition in schizophrenia:When and why does it go awry?

Turetsky

Kohler

Indersmitten

et al. 2007

Schizophrenia Research

215

170

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Objective-Schizophrenia patients demonstrate impaired emotional processing that may be due, in part, to impaired facial emotion recognition. This study examined event-related potential (ERP) responses to emotional faces in schizophrenia patients and controls to determine when, in the temporal processing stream, patient abnormalities occur.Method-16 patients and 16 healthy control participants performed a facial emotion recognition task. Very sad, somewhat sad, neutral, somewhat happy, and very happy faces were each presented for 100 ms. Subjects indicated whether each face was "Happy", "Neutral", or "Sad". Evoked potential data were obtained using a 32-channel EEG system.Results-Controls performed better than patients in recognizing facial emotions. In patients, better recognition of happy faces correlated with less severe negative symptoms. Four ERP components corresponding to the P100, N170, N250, and P300 were identified. Group differences were noted for the N170 "face processing" component that underlies the structural encoding of facial features, but not for the subsequent N250 "affect modulation" component. Higher amplitude of the N170 response to sad faces was correlated with less severe delusional symptoms. Although P300 abnormalities were found, the variance of this component was explained by the earlier N170 response. Conclusion-Patientswith schizophrenia demonstrate abnormalities in early visual encoding of facial features that precedes the ERP response typically associated with facial affect recognition. This suggests that affect recognition deficits, at least for happy and sad discrimination, are secondary Correspondence: Bruce I. Turetsky, M.

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“…Referring to the debates around the classical dichotomy of psychiatric literature dealing with Capgras symptom and DMSs, and the neurological literature dealing mainly with reduplicative paramnesia 17 numerous studies witness growing evidence of organic background in different misidentification syndromes 3,[18][19][20] . Nevertheless, some of them underline that no single brain lesion is specifically associated with reduplications 21 .…”

Section: Discussionmentioning

confidence: 99%

“…Delusional misidentification syndromes (DMS) -characterized by a belief in duplicates and replacements-can occur in several organic and major psychiatric disorders [1][2][3] . Recently, approaching an agreement on a clarifying classification of the misidentification phenomena, several authors 4-6 conceptualise two essentially different types of delusional misidentification syndromes, as the Capgras type (misidentificational disturbance with replacements) and the clonal pluralization type (pluralizational delusion with duplicates).…”

Section: Introductionmentioning

confidence: 99%

Clonal pluralization, as an interpretative delusion after a hallucinatory form of autoscopy

Nagy

Tényi²,

Kovács

et al. 2009

Eur. J. Psychiat.

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HUNGARYABSTRACT -Background and Objectives: Delusional misidentification syndromes are widely present in several major psychiatric and neurological disorders. After reviewing the recent terminology and psychopathology of the double phenomenon in the literature, the authors present a case of a patient with dementia, vascular type, where clonal pluralization of the Self appeared as a secondary, interpretative delusion after a hallucinatory type of autoscopic experience.Methods: Review of the literature and a case report.Results: In the presented case the linear evolution and the interpretative aspect of the arising misidentification phenomena are predominant. The differential diagnosis and the distinctive characteristics of the presented case from other potential delusional misidentification syndromes are also discussed. Brain lesions and neuropsychological impairments seem necessary, but the full development of these syndromes depends upon the individual's responses to his or her defects as much as the defects themselves.Conclusions: Overviewing the broad spectrum of concepts on delusional misidentification syndromes, the authors emphasize the importance of those approaches which enhance the disappearance of the classical organic-functional dichotomy on the double phenomenon and which try to clarify the neurocognitive background of delusional misidentifications.

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Delusional Misidentification Syndromes

Cited by 52 publications

References 12 publications

Can Gaze-Contingent Mirror-Feedback from Unfamiliar Faces alter Self-Recognition?

Can Gaze-Contingent Mirror-Feedback from Unfamiliar Faces alter Self-Recognition?

Facial emotion recognition in schizophrenia:When and why does it go awry?

Clonal pluralization, as an interpretative delusion after a hallucinatory form of autoscopy

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