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Attention Is Required to Coordinate Reaching and Postural Stability during Upper Limb Movements Generated While
Jill Dierijck1, Michael Kennefick1, Jonathan Smirl1
1School of Health and Exercise Sciences, The University of British Columbia, Kelowna, British Columbia, Canada.
Journal of Motor Behavior
|March 28, 2019
Summary
Attention is crucial for coordinating reaching movements and maintaining balance while standing. Performing a secondary task simultaneously with reaching impairs performance, highlighting attention
Area of Science:
- Neuroscience
- Biomechanics
- Human Motor Control
Background:
- Postural control is essential for stable upright stance.
- Reaching movements require complex planning and execution.
- The interplay between voluntary movements and postural stability is not fully understood.
Purpose of the Study:
- To investigate the role of attention in the interaction between reach planning/execution and postural control.
- To determine how attentional demands affect online movement control during perturbed reaching.
- To elucidate the resource requirements for coordinating reaching and postural tasks.
Main Methods:
- Participants performed reaching movements while standing, either alone or with a secondary reaction time (RT) task.
- Reaching movements were unexpectedly perturbed medially-laterally to assess online control.
- Measures included postural kinetics, arm kinematics, and reaction times for both primary and secondary tasks.
Main Results:
- Simultaneous performance of reaching and secondary tasks led to decreased performance in both.
- Unexpected perturbations revealed challenges in online movement control when attention was divided.
- Increased attentional load negatively impacted the coordination between reaching and postural control.
Conclusions:
- Generating reaching movements while standing demands significant attentional resources.
- Attention is critical for effectively coordinating the demands of reaching tasks with postural control.
- Dividing attention between reaching and other tasks compromises motor performance and stability.
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