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Locomotor adaptations to circumvent moving obstacles are initiated with respect to obstacle and self-motion perception, in order to predict and avoid an impending collision. We have developed a virtual reality (VR) based obstacle circumvention task to assess locomotor adaptation (experiment [Exp] 1) and the ability to predict an impending collision (Exp 2) as well as detection of the onset of obstacle...
Persons with visuospatial neglect are at risk of colliding with objects while walking due to their inattention to the contralesional space. Twelve participants were assessed on their ability to avoid moving obstacles while walking. Collisions were observed for head-on and contralesionally approaching obstacles, but not for ipsilesional ones. Participants showed delayed responses and maintained smaller...
The ability of healthy young individuals to accurately steer toward a virtual target while experiencing different foci of expansion (FOE) and target positions was examined with the use of a virtual reality task. Ten participants steered toward the virtual target with the use of mouse displacements while sitting or while changing their body orientation during over-ground walking. Net virtual errors...
The ability to accurately judge distance and time to collision is an important perceptual determinant in shaping obstacle circumvention strategies for functional locomotion. In addition, deficits in planning and execution, as well as biomechanical constraints imposed by age or neurological insult may lead to avoidance failure in this population. We have designed a closed system in sitting displaying...
The aim of the study was to examine the effects of changing optic flow and target location on goal-oriented heading in stroke. Two subjects with stroke and two healthy older subjects participated in a mouse-driven steering task while seated and a walking steering task. In the sitting experiment, stroke subjects showed less heading errors than older subjects, while in the walking experiment they had...
Persons with a chronic stroke often manifest mobility deficits that may in part be related to altered visuomotor control. Specifically, the ability to use optic flow, which reflects self-motion, may be compromised after a stroke. We evaluated the locomotor behavior of 6 subjects with chronic stroke as they walked overground while viewing a virtual room displayed in a head-mounted display. The subjects...
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