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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

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Summary
This summary is machine-generated.

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.

Keywords:
Combined tasksLocomotionOnline controlPrehensionUnpredictable environment

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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.