Dissociation of visual and haptic vertical in two patients with vestibular nuclear lesions
Identifieur interne : 000398 ( PascalFrancis/Curation ); précédent : 000397; suivant : 000399Dissociation of visual and haptic vertical in two patients with vestibular nuclear lesions
Auteurs : A. M. Bronstein [Royaume-Uni] ; D. A. Perennou [Royaume-Uni] ; M. Guerraz [Royaume-Uni] ; D. Playford [Royaume-Uni] ; P. Rudge [Royaume-Uni]Source :
- Neurology [ 0028-3878 ] ; 2003.
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Abstract
The somatosensory (haptic) vertical (HV) and visual vertical (VV) were assessed in two patients with vestibular nuclear lesions. Patient 1 had paroxysmal nystagmus, and was tested "on" and "off." The HV was normal "on" and "off" but the VV was severely tilted during vestibular paroxysms. Patient 2, with a brainstem stroke, was tested at months 1 and 6. The VV was severely tilted on both occasions (>12°) but the HV was marginally tilted (4°) in the acute stage only. These VV-HV dissociations suggest that vestibular nuclear lesions influence gravity perception mostly via ocular torsional effects rather than by disrupting a single, internal representation of verticality.
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