Virtual Reality-Based Navigation Task to Reveal Obstacle Avoidance Performance in Individuals With Visuospatial Neglect
Virtual Reality-Based Navigation Task to Reveal Obstacle Avoidance Performance in Individuals With Visuospatial Neglect
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DOI：
10.1109/tnsre.2014.2369812
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发表时间：
2015-03-01
影响因子：
4.9
通讯作者：
Lamontagne, Anouk
中科院分区：
文献类型：
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作者：
Aravind, Gayatri;Darekar, Anuja;Lamontagne, Anouk
患有中风后视觉空间忽视（VSN）的人在行走时经常会与移动的障碍物发生碰撞。目前尚不清楚碰撞的发生是由于 VSN 引起的注意力知觉缺陷还是由于中风后运动缺陷所致。我们对使用 VSN 的个体进行坐着、操纵杆驱动的避障任务进行评估，从而消除了运动的影响。 12 名使用 VSN 的参与者在虚拟环境中接受了障碍物检测和避障任务测试，其中包括 3 个正面接近的障碍物或 30 个对侧/同侧接近的障碍物。我们的结果表明，在检测任务中，与同侧障碍物相比，对侧障碍物和正面障碍物的检测距离更近。对于回避任务，仅在对向和正面障碍物接近时观察到碰撞。对于对向障碍物方法，参与者在距障碍物较小的距离处启动回避策略，并与障碍物保持较小的最小距离。对于所有三种障碍物接近，检测时的距离与回避策略开始时的距离呈负相关。我们得出的结论是，在没有运动负担的情况下，对对侧和正面障碍物的碰撞观察提供了证据，表明 VSN 引起的注意力知觉缺陷（独立于中风后运动缺陷）会改变避障能力。
Persons with post-stroke visuospatial neglect (VSN) often collide with moving obstacles while walking. It is not well understood whether the collisions occur as a result of attentional-perceptual deficits caused by VSN or due to post-stroke locomotor deficits. We assessed individuals with VSN on a seated, joystick-driven obstacle avoidance task, thus eliminating the influence of locomotion. Twelve participants with VSN were tested on obstacle detection and obstacle avoidance tasks in a virtual environment that included three obstacles approaching head-on or 30 contralesionally/ipsilesionally. Our results indicate that in the detection task, the contralesional and head-on obstacles were detected at closer proximities compared to the ipsilesional obstacle. For the avoidance task collisions were observed only for the contralesional and head-on obstacle approaches. For the contralesional obstacle approach, participants initiated their avoidance strategies at smaller distances from the obstacle and maintained smaller minimum distances from the obstacles. The distance at detection showed a negative association with the distance at the onset of avoidance strategy for all three obstacle approaches. We conclusion the observation of collisions with contralesional and head-on obstacles, in the absence of locomotor burden, provides evidence that attentional-perceptual deficits due to VSN, independent of post-stroke locomotor deficits, alter obstacle avoidance abilities.