Recognition Memory in Psychotic Patients

Ellis, Hadyn D.; Pauw, Karel de; Christodoulou, G.; Luauté, Jean-Pierre; Bidault, E.; Szulecka, Krystyna

doi:10.1155/1992/742635

Cited by 16 publications

(8 citation statements)

References 2 publications

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“…A similar procedure is used with words, and was included here to check for general cognitive impairment. Ellis et al (1992) found a substantial impairment on the faces part of this test in a small group of Capgras patients.…”

Section: (B) Facial Identity Processingmentioning

confidence: 78%

Reduced autonomic responses to faces in Capgras delusion

Ellis

Young

Quayle

et al. 1997

Proc. R. Soc. Lond. B

233

159

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SUMMARYPeople experiencing the Capgras delusion claim that others, usually those quite close emotionally, have been replaced by near-identical impostors. Ellis & Young suggested in 1990 that the Capgras delusion results from damage to a neurological system involved in orienting responses to seen faces based on their personal significance. This hypothesis predicts that people suffering the Capgras delusion will be hyporesponsive to familiar faces. We tested this prediction in five people with Capgras delusion. Comparison data were obtained from five middle-aged members of the general public, and a psychiatric control group of five patients taking similar anti-psychotic medication. Capgras delusion patients did not reveal autonomic discrimination between familiar and unfamiliar faces, but orienting responses to auditory tones were normal in magnitude and rate of initial habituation, showing that the hyporesponsiveness is circumscribed.

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Section: (B) Facial Identity Processingmentioning

confidence: 78%

Reduced autonomic responses to faces in Capgras delusion

Ellis

Young

Quayle

et al. 1997

Proc. R. Soc. Lond. B

233

159

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“…There is already evidence to show that DMS subjects have face processing deficits which are demonstrable on face recognition tasks [42][43][44][45] and the as sociation with Charles Bonnet syndrome raises the possibility that visual pathway im pairment at the level of the eye may need to be investigated. There is no published study addressing this issue as far as we know.…”

Section: Discussionmentioning

confidence: 99%

Delusional Misidentification Syndromes: A Descriptive Study

Oyebode

Sargeant²

1996

Psychopathology

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Twenty-three patients with one or more delusional misidentification syndromes were studied. The majority of the subjects were females and the Capgras syndrome was the most common delusional misidentification syndrome in our sample. The Capgras syndrome cases were significant older than the Fregoli syndrome cases. Schizophrenia and schizo-affective psychosis were significantly associated with Fregoli syndrome. Discriminant function analysis was carried out on the sample and showed that age and symptoms of nuclear schizophrenia were the variables most predictive of the type of delusional misidentification. These findings are discussed in the light of current literature.

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“…Not only do the present data fail to support Joseph's hy pothesis but if face recognition is exclusively a right hemisphere function one would not ex pect dual representations of familiar faces, one in each cerebral hemisphere. Given the results of Study l it is easy to make the prediction that CD patients will evince more problems than normal controls on face memory tasks [20]. In order to test this a group of 4 CD patients (3 of whom had tak en part in study 1) were given a test of unfa miliar face recognition that is commonly used in neuropsychological diagnosis [21].…”

Section: Studymentioning

confidence: 99%

“…To counter this possibility Ellis et al [20] also gave the WRMT faces task to 6 other psychotic patients matched as closely as possi ble to the CD group. Their median score was 44.0 -almost identical to the mean score for normal subjects shown in table 1, suggesting that being psychotic or receiving neuroleptic medication does not itself cause poor perfor mance on the WRMT faces task.…”

Section: Studymentioning

confidence: 99%

The Role of the Right Hemisphere in the Capgras Delusion

Ellis

1994

Psychopathology

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Following a general review of the literature linking right hemisphere dysfunction to psychoses in general and Capgras delusion (CD) in particular, two studies are described that confirm the link. Study 1 revealed that, compared with matched psychiatric controls, 3 CD patients were particularly poor at matching pairs of faces shown briefly in the left visual field – which implies dysfunctioning right hemisphere performance. However there was no difference in performance when the faces appeared bilaterally, which fails to support the hypothesis that poor interhemispheric communication may give rise to CD. The second study involved tests of face memory and word memory. CD and other delusional misidentification groups scored markedly low on the face test, again implying right hemisphere deficit. Finally, a model of what may be the right hemisphere mechanism giving rise to CD was explored. This assumes two routes to face recognition, ventral and dorsal. It is argued that exclusive damage to the former may cause prosopagnosia and problems in the latter may give rise to the symptoms of CD.

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Recognition Memory in Psychotic Patients

Cited by 16 publications

References 2 publications

Reduced autonomic responses to faces in Capgras delusion

Reduced autonomic responses to faces in Capgras delusion

Delusional Misidentification Syndromes: A Descriptive Study

The Role of the Right Hemisphere in the Capgras Delusion

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