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Iterative Spatial Updating During Forward Linear Walking Revealed Using a Continuous Pointing Task
James J Burkitt1,2, Jennifer L Campos3,4, James L Lyons1
1Department of Kinesiology, McMaster University, Hamilton, ON, Canada.
Journal of Motor Behavior
|April 16, 2019
Summary
Perception of walking distance is underestimated without vision. This spatial updating process appears linked to gait parameters, specifically the foot swing phase during walking.
Area of Science:
- Biomechanics
- Perception
- Motor control
Background:
- The continuous pointing task assesses perceived distance during locomotion.
- Online regulation of distance perception during walking is not fully understood.
Purpose of the Study:
- To investigate how vision influences perceived distance during continuous walking.
- To examine the relationship between upper extremity joint angles, gait kinematics, and spatial updating.
Main Methods:
- Participants performed continuous pointing movements in full vision and no-vision conditions.
- Upper extremity joint angles and step-cycle kinematics were measured.
- Shoulder plane of elevation trajectories were analyzed.
Main Results:
- Perceived distance was underestimated in no-vision trials compared to full vision.
- Discontinuities in shoulder movement trajectories correlated with perceptual underestimation.
- These discontinuities were often linked to the early right foot swing phase.
Conclusions:
- Vision plays a crucial role in accurate perceived distance estimation during walking.
- Spatial updating during locomotion may occur in discrete steps tied to gait parameters.
- The findings suggest a coupling between motor execution and perceptual processes.
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