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Related Experiment Videos

Prehension with trunk assisted reaching

M Saling1, G E Stelmach, S Mescheriakov

  • 1Motor Control Laboratory, Arizona State University, Tempe 85287-0404, USA.

Behavioural Brain Research
|October 1, 1996
PubMed
Summary

When reaching for objects, trunk movement assists arm transport but is decoupled during grasp. Motor control planning focuses on the hand and endpoint, not trunk coordination.

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Motor Control

Background:

  • Prehensile tasks often require trunk movement to extend reach beyond arm's capacity.
  • The incorporation of trunk motion into motor plans for reaching tasks remains incompletely understood.

Purpose of the Study:

  • To investigate the kinematic coupling between trunk and arm movements during reaching tasks requiring trunk flexion.
  • To determine if trunk motion is integrated into the motor plan for grasping objects of different sizes.

Main Methods:

  • Seated participants reached for and grasped small and large objects placed beyond their maximal reach.
  • Kinematic data of trunk and wrist movements were analyzed for velocity profiles, initiation order, and temporal coupling.

Main Results:

  • Wrist velocity exhibited a bell-shaped profile, similar to arm-only reaches.
  • Trunk movement often initiated before arm movement but became decoupled during grasping.
  • Wrist deceleration was sensitive to object size, with longer durations for smaller objects; trunk movement was not.

Conclusions:

  • Trunk movement assists in reaching but appears decoupled from the grasp phase.
  • Motor planning for reaching tasks involving trunk flexion primarily focuses on the hand and endpoint control.
  • Kinematic analysis suggests the wrist component, not the trunk, is directly linked to successful grasp achievement.

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