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Visual cues two-steps ahead are adequate to grasp an object while walking without compromising stability
Natalia Madalena Rinaldi1, Jongil Lim2, Joseph Hamill3
1Center of Physical Education and Sports, Department of Sports, Federal University of Espírito Santo, Brazil.
Human Movement Science
|May 25, 2021
Summary
Planning to walk and grasp requires advance visual cues. Two steps ahead is sufficient for appropriate movement, impacting stability and execution, especially with contralateral coordination.
Area of Science:
- Human motor control
- Biomechanics
- Neuroscience
Background:
- Previous research established anticipatory control for walking and grasping tasks.
- The impact of unpredictable environments on this combined task remains unclear.
- Investigating online control during walking and grasping with varying limb coordination is crucial.
Purpose of the Study:
- To examine the online control mechanisms in young adults performing a combined walking and grasping task.
- To assess how different upper- and lower-limb coordination patterns affect this task.
- To determine the influence of visual cue timing on task execution and stability.
Main Methods:
- Fifteen young adults participated in the study.
- Participants walked and grasped a dowel under varied conditions.
- Conditions manipulated visual cue timing (two steps ahead or earlier) and limb coordination patterns (ipsilateral vs. contralateral).
Main Results:
- Visual cues provided two steps ahead were adequate for appropriate task execution.
- Early visual cues influenced walking stability and prehension movement.
- Ipsilateral coordination enhanced mediolateral stability, while contralateral coordination decreased it when cues were one step ahead.
Conclusions:
- Planning the combined walking and reaching task two steps ahead maintains typical movement characteristics.
- Sufficient planning time allows prehension initiation well before heel contact.
- Disrupted natural limb coordination occurs when cues are provided only one step before grasping.
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