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Related Experiment Videos

The relation between force and movement when grasping an object with a precision grip.

Marianne Biegstraaten1, Jeroen B J Smeets, Eli Brenner

  • 1Department of Neuroscience, ErasmusMC, Postbus 1738, 3000 DR, Rotterdam, The Netherlands. biegstraaten-meeuws@wanadoo.nl

Experimental Brain Research
|November 25, 2005
PubMed
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Grasping objects involves precise finger movements and forces. This study found that reaching for an object and lifting it are independent actions, with separate control mechanisms for each phase.

Area of Science:

  • Biomechanics
  • Motor Control
  • Human-Robot Interaction

Background:

  • Fingers approach surfaces perpendicularly for accurate object manipulation.
  • Forces applied during grasping must be perpendicular to prevent slipping.
  • The coordination between reaching and lifting phases of grasping is not fully understood.

Purpose of the Study:

  • To investigate whether the control of reaching movements and lifting forces are coordinated during object acquisition.
  • To determine if the perpendicular approach to an object's surface is maintained during the transition to lifting.

Main Methods:

  • Subjects were asked to pick up a cube from three distinct starting positions.
  • Digit movements and forces were measured from pre-contact to the initiation of cube movement.

Related Experiment Videos

  • Analysis focused on the relationship between reaching trajectory and applied grip/lift forces.

    • Main Results:

    • The impact force upon initial contact was minimal.
    • Digits maintained contact for approximately 200 ms before lifting the cube.
    • A gradual increase in grip and lift forces was observed after initial contact and deceleration.
    • No direct correlation was found between the reaching phase's control and the subsequent lifting force application.

    Conclusions:

    • Reaching and lifting phases of object manipulation are controlled independently.
    • Separate neural or mechanical mechanisms likely govern the trajectory planning and force modulation during grasping.