Are rotations in perceived visual vertical and body axis after stroke caused by the same mechanism?

Détails

ID Serval
serval:BIB_0928B732BE28
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Are rotations in perceived visual vertical and body axis after stroke caused by the same mechanism?
Périodique
Stroke
Auteur⸱e⸱s
Barra J., Benaim C., Chauvineau V., Ohlmann T., Gresty M., Pérennou D.
ISSN
1524-4628 (Electronic)
ISSN-L
0039-2499
Statut éditorial
Publié
Date de publication
2008
Volume
39
Numéro
11
Pages
3099-3101
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't Publication Status: ppublish
Résumé
BACKGROUND AND PURPOSE: The aim of this study was to investigate whether allocentric and egocentric coordinate systems are congruently biased after hemisphere stroke, which would suggest a single underlying mechanism.
METHODS: The perception of the long body axis (LBA), an egocentric reference, and that of the subjective visual vertical (SVV), an allocentric reference, was assessed in both the upright position and with 30 degrees lateral body tilts in 15 patients with a hemisphere stroke and 12 control subjects.
RESULTS: In control subjects, estimates were accurate in upright but rotated in tilted positions (LBA 7 degrees +/-6 degrees overestimation and SVV 8.8 degrees +/-7.8 degrees toward the body). In patients, SVV (-4.4 degrees +/-4.6 degrees ) and LBA (-4.8 degrees +/-5.3 degrees ) were congruent in upright positions and when patients were ipsilesionally tilted (1.5 degrees +/-7 degrees and 1.9 degrees +/-7 degrees , respectively). In contrast, SVV and LBA were dissociated when the body was tilted to the contralesional side with overestimation of the LBA (-9.2 degrees +/-4.6 degrees ) but no effect on SVV (-4.1 degrees +/-6.4 degrees ).
CONCLUSIONS: Because rotations in egocentric and allocentric reference systems found after stroke are differently modulated by lateral tilts, they are not due to a single underlying mechanism. However, they share common bases and can be simultaneously reduced by ipsilesional body tilt. Differences in the way somesthetic information is integrated may explain the differences in LBA and SVV.
Mots-clé
Adult, Aged, Female, Humans, Male, Middle Aged, Posture, Proprioception/physiology, Rotation, Space Perception/physiology, Stroke/physiopathology, Visual Perception/physiology
Pubmed
Web of science
Open Access
Oui
Création de la notice
19/01/2016 14:26
Dernière modification de la notice
20/08/2019 13:31
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