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Measurement of Spatial Stability in Precision Grip
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Does visually induced self-motion affect grip force when holding an object?

Lionel Bringoux1, Jean-Claude Lepecq, Frédéric Danion

  • 1Institute of Movement Sciences, Aix-Marseille University and Centre National de la Recherche Scientifique, Marseille, France.

Journal of Neurophysiology
|June 23, 2012
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Summary
This summary is machine-generated.

Visually induced self-motion (vection) affects arm movement but not grip force control when holding an object. This suggests sensorimotor system coupling strength varies by effector, impacting grip force modulation independently of perceived motion.

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Area of Science:

  • Neuroscience
  • Human sensorimotor control
  • Perception

Background:

  • Accurate grip force is crucial for object manipulation, counteracting gravity and inertia.
  • Visually induced self-motion (vection) can alter perceived object load.
  • The influence of vection on grip force control remains unclear.

Purpose of the Study:

  • To investigate if visually induced self-motion (vection) affects grip force control.
  • To determine if vection influences grip force modulation during object manipulation.
  • To examine the coupling between perceptual experience and sensorimotor responses.

Main Methods:

  • Participants held an object while experiencing simulated vertical elevator motion in a virtual reality environment.
  • Visual stimuli included oscillatory and constant-speed elevator movements.
  • Arm loading conditions varied (object presence, arm oscillation) and grip/arm forces were analyzed.

Main Results:

  • Vection was successfully induced, causing a strong sensation of self-motion.
  • Oscillatory vection entrained arm motion, demonstrating an effect on motor control.
  • Grip force showed no modulation related to the virtual changes in object load, indicating grip-to-load force coupling was unaffected.

Conclusions:

  • Vection interferes with arm movement control but not with grip force modulation.
  • Neural mechanisms of vection impact motor control separately from grip force regulation.
  • Sensorimotor system coupling strength is effector-dependent and can be modulated by perceptual input.