scholarly journals Lithium Intoxication Presenting as a Mixed Misidentification Syndrome

1992 ◽  
Vol 5 (1) ◽  
pp. 19-22 ◽  
Author(s):  
S. G. Potts
Keyword(s):  
Right Hemisphere ◽  
Cerebral Atrophy ◽  
Ct Scanning ◽  
Lithium Intoxication ◽  
Capgras Syndrome ◽  
The Right ◽  
Misidentification Syndromes

A case is reported of lithium intoxication presenting with a mixed misidentification syndrome including features of Capgras syndrome. CT scanning showed cerebral atrophy, greater on the right, consistent with earlier evidence, suggesting that misidentification syndromes are more common with right hemisphere lesions.

Delusional Misidentification, AIDS and the Right Hemisphere

1990 ◽  
Vol 157 (4) ◽  
pp. 608-610 ◽  
Author(s):  
Paul Crichton ◽  
Shôn Lewis
Keyword(s):  
Right Hemisphere ◽  
Neuropsychological Testing ◽  
Ct Scanning ◽  
Acute Confusional State ◽  
Confusional State ◽  
Visuospatial Deficits ◽  
Capgras Syndrome ◽  
Serial Ct ◽  
The Right ◽  
Parietal Lesion

A patient with AIDS developed the Capgras' syndrome as part of an acute confusional state resulting from an opportunistic infection. Neuropsychological testing suggested non-dominant hemisphere dysfunction with impaired facial recognition. Serial CT scanning showed a right parietal lesion which resolved after the psychosis improved. These findings provide further evidence for the hypothesis that selective visuospatial deficits underlie the development of Capgras' syndrome.

DELUSIONAL MISIDENTIFICATION SYNDROME: DISSOCIATION BETWEEN RECOGNITION AND IDENTIFICATION PROCESSES

2019 ◽  
Vol 17 (4) ◽  
pp. 456-467
Author(s):  
Kamil Leis ◽  
Ewelina Mazur ◽  
Mariusz Racinowski ◽  
Tomasz Jamrożek ◽  
Jakub Gołębiewski ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Treatment Guidelines ◽  
Diagnostic Methods ◽  
Temporal Lobes ◽  
Neuronal Connections ◽  
Online Management ◽  
The Right ◽  
Misidentification Syndromes ◽  
Patient’S Will ◽  
Identification Processes

Delusional misidentification syndrome (DMS) is an umbrella term for syndromes of intermetamorphosis, Fregoli, and Capgras. DMS) is thought to be related to dissociation between recognition and identification processes. DMS was described for the first time in 1932 as a variant of the Capgras syndrome and is currently on the DSM-V list of diseases as an independent disease entity. Patients affected by DMS believed that people around them, most often family, have changed physically (appearance) and mentally (character). Other symptoms include confabulation, derealization or depersonalization. In patients, aggressive behavior is often observed, aimed at alleged doppelgangers resulting from the sense of being cheated and manipulated. With the intermetamorphosis syndrome, for example, schizophrenia, depression, bipolar disorder or other misidentification syndromes (Fregoli's, Capgras) may coexist. There is also a reverse intermetamorphosis, where the object of the changed appearance or character becomes the patient himself. One of its forms may be lycanthropy. The etiology of the intermetamorphosis has not been fully understood, one of the reasons may be brain damage and changes in the parietal and/or temporal lobes of the right hemisphere. It may then damage long neuronal connections to the frontal areas of the brain, disturbances of working memory (WM) accountable for the keep and online management of data, so that it is available for further processing, and the patient's will be uncritical. The basic method of diagnosis of this delusion is a medical interview with the patient. Other diagnostic methods include computed tomography, magnetic resonance imaging, EEG and ERPs. Experimental methods include searching for the neuromarker of DMS. Currently, there are no treatment guidelines of this delusional disorder, and pharmacotherapy experimental, but the drugs from the group of neuroleptics and lithium seem effective. Some hope for the treatment is created by neurotherapy, but it is also experimental.

scholarly journals Capgras syndrome in a very late onset, treatment resistant schizophrenia

2015 ◽  
Vol 27 (9) ◽  
pp. 1573-1575 ◽  
Author(s):  
M. K. Nurul Ain ◽  
R. Rosdinom ◽  
M. Raynuha
Keyword(s):  
Myocardial Infarction ◽  
Right Hemisphere ◽  
Late Onset ◽  
Cerebral Atrophy ◽  
Positive Symptoms ◽  
Treatment Resistant ◽  
Age Related ◽  
Capgras Syndrome ◽  
Brain Ct Scan ◽  
Depot Injections

ABSTRACTWe report a Malay man, with underlying chronic medical illnesses, presenting with positive symptoms of schizophrenia, including Capgras syndrome (CS) at the age of 73. Physical examination and blood investigations were normal and brain CT scan showed age-related cerebral atrophy. Neuropsychological assessment showed probable right hemisphere lesions but relatively intact memory and intellectual functions. Several neuroleptics including depot injections were tried but ineffective. Positive symptoms including CS eventually improved with clozapine before his death from myocardial infarction. This case report highlights the uncommon occurrence of CS in treatment resistant schizophrenia (TRS) of very late onset and its treatment challenges.

Bihemispheric Language Disorders in Early-Stage Dementia of the Alzheimer Type: Evidence From a Novel Metalinguistic Task

1996 ◽  
Vol 8 (1) ◽  
pp. 63-81 ◽  
Author(s):  
Luc P. De Vreese ◽  
Mirco Neri ◽  
Gianfranco Salvioli ◽  
Carlo Cipolli
Keyword(s):  
Cognitive Skills ◽  
Right Hemisphere ◽  
Early Stage ◽  
Cerebral Atrophy ◽  
Target Sentence ◽  
Alzheimer Type ◽  
Right Cerebral Hemisphere ◽  
Stimulus Sentence ◽  
The Right ◽  
Elderly Control

Because dementia of the Alzheimer type (DAT) is commonly characterized by bilateral cerebral atrophy, we examined the issue of higher linguistic abilities lateralized to the right cerebral hemisphere (RH) in earlystage DAT. A modified version of an insertion task was administered to 14 patients with probable DAT, 8 right-hemisphere brain-damaged (RHD) patients, 8 left-hemisphere brain-damaged (LHD) patients, and 28 normal elderly (control, CTR) right-handed subjects. The task consisted of presenting the subjects with 53 well-formed sentences; in each a word or syntagm had to be inserted grammatically. Twenty-eight word/syntagm insertions required grammatical role reassignment of a lexical item in the stimulus sentence (shift, sensitive to RHD); 25 insertions implied only semantic reinterpretation of the target sentence (nonshift, sensitive to LHD). The three pathological groups were relatively and similarly impaired on standard aphasia assessment. The performances of the DAT patients, controlled for global cognitive verbal proficiency, verbal cognitive skills, and mood, were found to be significantly worse than the performances of the CTR group on both insertion subtests, whereas there were no significant differences between the DAT and RHD subjects on the shift items or between the DAT and LHD subjects on the nonshift items. Similarly, no differences were noted between the RHD and CTR nonshift scores, or between the LHD and CTR shift scores. On the other hand, the LHD group outscored the RHD group on the shift insertions. A comparison between the two insertion subtests revealed that only the RHD and DAT groups performed significantly worse on the shift than on the nonshift items. Results are consistent with other anecdotally reported RH-specific language-related disorders in early DAT and replicate previous findings of bihemispheric extralinguistic disturbances in these patients.

Psychiatric, neurological and medical aspects of misidentification syndromes: a review of 260 cases

1991 ◽  
Vol 21 (4) ◽  
pp. 905-910 ◽  
Author(s):  
Hans Förstl ◽  
Osvaldo P. Almeida ◽  
Adrian M. Owen ◽  
Alistair Burns ◽  
Robert Howard
Keyword(s):  
Right Hemisphere ◽  
Neurological Diseases ◽  
Case Reports ◽  
Neuropsychological Testing ◽  
Functional Psychosis ◽  
Paranoid Type ◽  
The Right ◽  
Misidentification Syndromes ◽  
Mistaken Identification ◽  
Reduplicative Paramnesia

SYNOPSISTwo hundred and sixty case reports of misidentification syndromes were evaluated. One hundred and seventy-four patients had a Capgras syndrome misidentifying other persons, 18 a Fregoli syndrome, 11 intermetamorphosis, 17 reduplicative paramnesia and the rest had other forms or combinations of mistaken identification. Schizophrenia (127 cases), mostly of paranoid type, affective disorder (29), and organic mental syndromes including dementia (46) were the most common diagnoses in patients who misidentified others or themselves. The patients with reduplicative paramnesia more frequently suffered from head trauma or cerebral infarction and showed more features of right hemisphere lesions on neuropsychological testing or CT scan than the patients with other misidentification syndromes. Forty-one case-reports implicated underlying medical conditions. Forty-six of the patients were reported to show violent behavioaur.The misidentification of persons can be a manifestation of any organic or functional psychosis, but the misidentification of place is frequently associated with neurological diseases, predominantly of the right hemisphere. Misidentification syndromes show a great degree of overlap and do not represent distinctive syndromes nor can they be regarded as an expression of a particular disorder. These patients deserve special diagnostic and therapeutic attention because of the possible underlying disorders and their potentially dangerous behavioura.

Delusional Misidentification and the Role of the Right Hemisphere in the Appreciation of Identity

1991 ◽  
Vol 159 (S14) ◽  
pp. 70-75 ◽  
Author(s):  
J. Cutting
Keyword(s):  
Right Hemisphere ◽  
Capgras Syndrome ◽  
Number Of Publications ◽  
The Right

For over 50 years, Capgras' syndrome (Capgras & Reboul-Lachaux, 1923) was considered a psychiatric curiosity, fit only for inclusion among other ‘rarities’ in psychiatric textbooks and explicable only in psychodynamic terms. In the last few years, however, the number of publications on the topic has increased enormously, and three solid facts have emerged which give a clue to its nature. In this article, I shall discuss these three facts and, in the light of them, propose a psychological and neuropsychological explanation for the syndrome.

scholarly journals The Comorbidity of Reduplicative Paramnesia, Intermetamorphosis, Reverse-Intermetamorphosis, Misidentification of Reflection, and Capgras Syndrome in an Adolescent Patient

2014 ◽  
Vol 2014 ◽  
pp. 1-3 ◽  
Author(s):  
Ozden Arısoy ◽  
A. Evren Tufan ◽  
Rabia Bilici ◽  
Sarper Taskiran ◽  
Zehra Topal ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Case Series ◽  
Adolescent Patient ◽  
Her Family ◽  
Face To Face ◽  
The People ◽  
Capgras Syndrome ◽  
Misidentification Syndromes ◽  
Patient Change ◽  
Reduplicative Paramnesia

Delusional misidentification syndromes may be superimposed on neurological or psychiatric disorders and include delusional beliefs that the people, objects, or places around the patient change or are made to change with one another. In this paper, an adolescent patient displaying Capgras syndrome, metamorphosis, reverse-intermetamorphosis, misidentification of reflection, and reduplicative paramnesia was presented. The findings that our patient struggled with visuospatial tests applied in the acute phase as well as the observation that she refused to meet her family face-to-face while accepting to speak on the phone may support the role of right hemisphere and visuospatial functions in the development of those syndromes. Further studies or case series evaluated more extensively are needed to reveal the relationship between right hemisphere functions and delusional misidentification syndromes.

Investigation of the Effect of Mode and Tempo on Emotional Responses to Music Using EEG Power Asymmetry

2013 ◽  
Vol 27 (3) ◽  
pp. 142-148 ◽  
Author(s):  
Konstantinos Trochidis ◽  
Emmanuel Bigand
Keyword(s):  
Left Hemisphere ◽  
Right Hemisphere ◽  
Emotional Responses ◽  
Interactive Effects ◽  
Eeg Activity ◽  
Musical Excerpt ◽  
Major Mode ◽  
Musical Modes ◽  
Slow Tempo ◽  
The Right

The combined interactions of mode and tempo on emotional responses to music were investigated using both self-reports and electroencephalogram (EEG) activity. A musical excerpt was performed in three different modes and tempi. Participants rated the emotional content of the resulting nine stimuli and their EEG activity was recorded. Musical modes influence the valence of emotion with major mode being evaluated happier and more serene, than minor and locrian modes. In EEG frontal activity, major mode was associated with an increased alpha activation in the left hemisphere compared to minor and locrian modes, which, in turn, induced increased activation in the right hemisphere. The tempo modulates the arousal value of emotion with faster tempi associated with stronger feeling of happiness and anger and this effect is associated in EEG with an increase of frontal activation in the left hemisphere. By contrast, slow tempo induced decreased frontal activation in the left hemisphere. Some interactive effects were found between mode and tempo: An increase of tempo modulated the emotion differently depending on the mode of the piece.

Right-Hemisphere Specialization for Contour Grouping

2014 ◽  
Vol 61 (5) ◽  
pp. 331-339 ◽  
Author(s):  
Gregor Volberg
Keyword(s):  
Right Hemisphere ◽  
Contour Detection ◽  
Global Processing ◽  
Detection Accuracy ◽  
Frequency Spectra ◽  
Visual Hemifield ◽  
Spatial Frequencies ◽  
A Chain ◽  
The Right ◽  
Hemisphere Specialization

Previous studies often revealed a right-hemisphere specialization for processing the global level of compound visual stimuli. Here we explore whether a similar specialization exists for the detection of intersected contours defined by a chain of local elements. Subjects were presented with arrays of randomly oriented Gabor patches that could contain a global path of collinearly arranged elements in the left or in the right visual hemifield. As expected, the detection accuracy was higher for contours presented to the left visual field/right hemisphere. This difference was absent in two control conditions where the smoothness of the contour was decreased. The results demonstrate that the contour detection, often considered to be driven by lateral coactivation in primary visual cortex, relies on higher-level visual representations that differ between the hemispheres. Furthermore, because contour and non-contour stimuli had the same spatial frequency spectra, the results challenge the view that the right-hemisphere advantage in global processing depends on a specialization for processing low spatial frequencies.

Thinking in Animals, Infants, and the Right Hemisphere

1990 ◽  
Vol 35 (6) ◽  
pp. 544-547
Author(s):  
Randi C. Martin
Keyword(s):  
Right Hemisphere ◽  
The Right
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