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Related Experiment Video

Updated: Jun 30, 2026

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
10:51

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans

Published on: January 15, 2018

Coupling between reaching movement direction and hand orientation for grasping.

Nezha Bennis1, Agnès Roby-Brami

  • 1Neurophysique and physiology of the motor system, UMR 8119, CNRS, Paris, France.

Brain Research
|October 12, 2002
PubMed
Summary
This summary is machine-generated.

Hand orientation during grasping aligns with reaching direction, demonstrating a robust coupling. This connection is independent of initial hand position or trunk orientation, suggesting an environment-centered reference frame for movement control.

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Last Updated: Jun 30, 2026

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
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09:41

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Motor Control

Background:

  • Previous research established a link between reaching movement direction and hand orientation (azimuth) during grasping.
  • The generality and underlying reference frame of this coupling required further investigation.

Purpose of the Study:

  • To examine the generality of the coupling between reaching movement direction and hand azimuth at grasp.
  • To determine the reference frame (hand-centered, shoulder-centered, or environment-centered) underlying this motor coupling.

Main Methods:

  • Three experiments were conducted involving subjects reaching for objects in a horizontal plane.
  • Hand movements, including 3D position and orientation (azimuth), were recorded using an electromagnetic sensor.
  • Variations in object location, initial hand posture, and trunk orientation were systematically manipulated.

Main Results:

  • A strong coupling was observed between hand azimuth at grasp and reaching movement direction in the central workspace, with limitations at extreme rightward reaches.
  • This coupling persisted regardless of the object's destination after grasping.
  • The observed coupling remained consistent despite variations in initial hand azimuth and initial upper trunk orientation.

Conclusions:

  • The reaching movement direction is coupled with hand azimuth at the time of grasping, not with a separate rotational hand movement.
  • The findings challenge explanations based on hand-centered or shoulder-centered coordinate systems.
  • Results strongly suggest that reaching movements are planned and executed within an environment-centered reference frame.