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Related Experiment Videos

Reaching beyond reach.

M Flanders1, L Daghestani, A Berthoz

  • 1Department of Neuroscience, University of Minnesota, Minneapolis 55455, USA. martha@gander.med.umn.edu

Experimental Brain Research
|May 20, 1999
PubMed
Summary
This summary is machine-generated.

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This study on whole-body reaching movements found that reduced head rotation during virtual target reaches led to errors. This suggests head-eye-hand coordination is crucial for accurate sensorimotor control.

Area of Science:

  • Neuroscience
  • Biomechanics
  • Motor Control

Background:

  • Sensorimotor processing algorithms are often studied through analyzing errors in two-joint reaching movements.
  • Previous research has primarily focused on arm movements, with less attention paid to the role of the whole body in reaching tasks.

Purpose of the Study:

  • To investigate whole-body coordination during reaching movements, particularly when targets are beyond arm's length.
  • To analyze errors in virtual-target reaching to understand their implications for sensorimotor control.
  • To explore the role of head, trunk, and leg movements in reaching tasks.

Main Methods:

  • Subjects performed reaching movements to both real and virtual targets.
  • Virtual targets were removed at the start of the reach, requiring memory-based guidance.

Related Experiment Videos

  • Kinematic data, including head, trunk, and arm movements, were analyzed.

    • Main Results:

    • Significant errors were observed in the virtual-target condition compared to real targets.
    • Subjects exhibited less head rotation when reaching for virtual targets.
    • Final head angles were geometrically related to inaccurate hand positions, indicating a link between head posture and reaching errors.

    Conclusions:

    • Head-eye-hand coordination is vital for organizing reaching movements, especially in conditions relying on internal target representation.
    • Reduced head rotation in virtual-target tasks may contribute to reaching errors.
    • A representation of gaze direction might function as a reference signal for arm motor control.