[article] 
inAnnals of physical and rehabilitation medicine > Vol. 61, n°4 (Juillet 2018) . - p. 197-206

Titre :	Effect of visuospatial neglect on spatial navigation and heading after stroke
Type de document :	texte imprimé
Auteurs :	Gayatri Aravind ; Anouk Lamontagne
Année de publication :	2018
Article en page(s) :	p. 197-206
Note générale :	Doi : 10.1016/j.rehab.2017.05.002
Langues :	Anglais (eng)
Mots-clés :	Visual neglect  Cerebrovascular accident  Steering  Obstacle circumvention  Virtual Reality
Résumé :	Background Visuospatial neglect (VSN) impairs the control of locomotor heading in post-stroke individuals, which may affect their ability to safely avoid moving objects while walking. Objective We aimed to compare VSN+ and VSN− stroke individuals in terms of changes in heading and head orientation in space while avoiding obstacles approaching from different directions and reorienting toward the final target. Methods Stroke participants with VSN (VSN+) and without VSN (VSN−) walked in a virtual environment avoiding obstacles that approached contralesionally, head-on or ipsilesionally. Measures of obstacle avoidance (onset-of-heading change, maximum mediolateral deviation) and target alignment (heading and head-rotation errors with respect to target) were compared across groups and obstacle directions. Results In total, 26 participants with right-hemisphere stroke participated (13 VSN+ and 13 VSN−; 24 males; mean age 60.3 years, range 48 to 72 years). A larger proportion of VSN+ (75%) than VSN− (38%) participants collided with contralesional and head-on obstacles. For VSN− participants, deviating to the same side as the obstacle was a safe strategy to avoid diagonal obstacles and deviating to the opposite-side led to occasional collisions. VSN+ participants deviated ipsilesionally, displaying same-side and opposite-side strategies for ipsilesional and contralesional obstacles, respectively. Overall, VSN+ participants showed greater distances at onset-of-heading change, smaller maximum mediolateral deviation and larger errors in target alignment as compared with VSN− participants. Conclusion The ipsilesional bias arising from VSN influences the modulation of heading in response to obstacles and, along with the adoption of the “riskier” strategies, contribute to the higher number colliders and poor goal-directed walking abilities in stroke survivors with VSN. Future research should focus on developing assessment and training tools for complex locomotor tasks such as obstacle avoidance in this population.
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[article] Effect of visuospatial neglect on spatial navigation and heading after stroke [texte imprimé] / Gayatri Aravind ; Anouk Lamontagne . - 2018 . - p. 197-206.
Doi : 10.1016/j.rehab.2017.05.002
Langues : Anglais (eng)
in Annals of physical and rehabilitation medicine > Vol. 61, n°4 (Juillet 2018) . - p. 197-206

Mots-clés :	Visual neglect  Cerebrovascular accident  Steering  Obstacle circumvention  Virtual Reality
Résumé :	Background Visuospatial neglect (VSN) impairs the control of locomotor heading in post-stroke individuals, which may affect their ability to safely avoid moving objects while walking. Objective We aimed to compare VSN+ and VSN− stroke individuals in terms of changes in heading and head orientation in space while avoiding obstacles approaching from different directions and reorienting toward the final target. Methods Stroke participants with VSN (VSN+) and without VSN (VSN−) walked in a virtual environment avoiding obstacles that approached contralesionally, head-on or ipsilesionally. Measures of obstacle avoidance (onset-of-heading change, maximum mediolateral deviation) and target alignment (heading and head-rotation errors with respect to target) were compared across groups and obstacle directions. Results In total, 26 participants with right-hemisphere stroke participated (13 VSN+ and 13 VSN−; 24 males; mean age 60.3 years, range 48 to 72 years). A larger proportion of VSN+ (75%) than VSN− (38%) participants collided with contralesional and head-on obstacles. For VSN− participants, deviating to the same side as the obstacle was a safe strategy to avoid diagonal obstacles and deviating to the opposite-side led to occasional collisions. VSN+ participants deviated ipsilesionally, displaying same-side and opposite-side strategies for ipsilesional and contralesional obstacles, respectively. Overall, VSN+ participants showed greater distances at onset-of-heading change, smaller maximum mediolateral deviation and larger errors in target alignment as compared with VSN− participants. Conclusion The ipsilesional bias arising from VSN influences the modulation of heading in response to obstacles and, along with the adoption of the “riskier” strategies, contribute to the higher number colliders and poor goal-directed walking abilities in stroke survivors with VSN. Future research should focus on developing assessment and training tools for complex locomotor tasks such as obstacle avoidance in this population.
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