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Revue Neurologique
Volume 164, Issue 5, May 2008, Pages 481-485
 
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doi:10.1016/j.neurol.2008.02.038    How to Cite or Link Using DOI (Opens New Window)
Copyright © 2008 Elsevier Masson SAS All rights reserved.

Brève communication

Hallucinations visuelles complexes après infarctus occipital et perception d’illusions visuelles

Complex visual hallucinations following occipital infarct and perception of optical illusions

P. RenouCorresponding Author Contact Information, a, E-mail The Corresponding Author, S. Deltoura and Y. Samsona

aUrgences cérébrovasculaires, AP–HP, hôpital de la Pitié-Salpêtrière, 47, boulevard de l’Hôpital, 75013 Paris, France, et UPMC Paris universitas

Reçu le 11 juin 2007; 
revised 26 décembre 2007; 
accepté le 8 février 2008. 
Available online 18 April 2008.

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Résumé

Introduction

Les hallucinations visuelles dans le champ hémianopsique après un infarctus occipital ont une physiopathologie mal comprise.

Observation

Nous avons étudié la perception d’illusions d’optique chez un homme, avec antécédent d’infarctus occipital, ayant présenté des hallucinations visuelles complexes dans son champ quadranopsique au décours d’une récidive occipitale controlatérale. L’association de ces deux lésions occipitales pourrait avoir généré une double perception visuelle consciente et dissociée, hallucinatoire par ailleurs et réelle de l’autre.

Conclusion

L’étude de la perception des illusions chez des patients atteints d’hallucinations visuelles pourrait contribuer à valider les théories actuelles d’une conscience visuelle non pas unifiée, mais composée de microconsciences.

Abstract

Introduction

The physiopathology of visual hallucinations in the hemianopic field secondary to occipital infarct is uncertain.

Case report

We report the case of a patient with a history of occipital infarct who presented nonstereotyped complex hallucinations in the quadranopic field resulting from a second controlateral occipital infarct. Based on an experience with motion optical illusions, we suggested that the association of these two occipital lesions, involving the V5 motion area on the one side and the V1 area on the other side, could have produced the complex hallucinations due to a release phenomenon. The patient experienced simultaneously a double visual consciousness, with both hallucinations and real visual perceptions.

Conclusion

The study of perceptual illusions in patients with visual hallucinations could illustrate the innovative theory of visual consciousness as being not unified but constituted of multiple microconsciousnesses.

Mots clés: Hallucinations visuelles; Infarctus occipital; Hémianopsie; Aire V5; Conscience visuelle


Keywords: Visual hallucinations; Occipital infarct; Hemianopsia; V5 area; Visual consciousness

Article Outline

1. Introduction
2. Observation
2.1. Cas no 05 1122
3. Discussion
4. Conclusion
References





Revue Neurologique
Volume 164, Issue 5, May 2008, Pages 481-485
 
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