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Operation of the Collaborative Composite Manufacturing (CCM) System

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Trajectories in operating a handheld tool.

Herbert Heuer¹, Sandra Sülzenbrück

¹Institut fur Arbeitsphysiologie an der Universitat Dortmund, Dortmund, Germany. heuer@ifado.de

Journal of Experimental Psychology. Human Perception and Performance

|April 1, 2009

Summary

Motor control research reveals that the brain plans movements based on the tool

Area of Science:

Biomechanics
Motor Control
Human Movement Science

Background:

Handheld tools, like sliding levers, present unique challenges in motor control.
Understanding how the brain controls tool use is crucial for human-robot interaction and rehabilitation.

Purpose of the Study:

To investigate the kinematic variables guiding motor planning and control during aiming movements with a sliding first-order lever.
To determine the influence of visual feedback on the planning and execution of tool-use movements.

Main Methods:

Analysis of hand and lever tip trajectories during aiming tasks.
Comparison of movement paths with and without visual feedback of the lever tip's position.

Main Results:

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Hand trajectories were often straight when lever tip trajectories were curved, and vice versa.

Lever tip trajectories showed fewer deviations from straight paths than hand trajectories, even without visual feedback.

Continuous visual feedback reduced deviations in lever tip paths, suggesting online corrections.

Conclusions:

The effective part of the tool, not just the hand, is a primary kinematic variable in motor planning.
Motor control adapts to tool dynamics, utilizing visual feedback for online corrections to minimize path deviations.