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Related Experiment Videos

Grip responses to object load perturbations are stimulus and phase sensitive.

L A Mrotek1, B A Hart, P K Schot

  • 1Department of Human Kinetics, University of Wisconsin, Milwaukee, PO Box 413, Milwaukee, WI 53201, USA. mrot0003@umn.edu

Experimental Brain Research
|December 23, 2003
PubMed
Summary

Grip force adjustments are faster and larger when lifting heavier objects. Surprisingly, people also reduce grip force when an object feels lighter, even when not required.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Motor Control

Background:

  • Grasp stability responses to load perturbations are well-studied when stability is challenged.
  • Responses to load changes not challenging grasp stability are less understood.

Purpose of the Study:

  • To compare grasp responses to functionally opposite load perturbations (increased vs. decreased load).
  • To investigate how load changes affect grip force modulation during object holding and lifting.

Main Methods:

  • Participants held and lifted an object with altered pulling forces, creating sudden increases or decreases in load.
  • Grip force modulation was analyzed during steady holds and active lifts.

Main Results:

  • Grip force modulation was faster, larger, and had a higher maximum rate with increased load and during active lifts.

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  • Participants voluntarily decreased grip force when load decreased, though more slowly.
  • Decreased load perturbations did not necessitate grip force adjustments for stability.

    • Conclusions:

    • Increasing object load significantly enhances grip force modulation, suggesting greater functional importance.
    • Dynamic lifting tasks may offer sensory or motor facilitation, leading to quicker responses.
    • The human grasp system prioritizes stability and actively adapts to changing load conditions.