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Related Experiment Videos

The right arm likes to be close.

Jonathan Graff-Radford1, Gregory P Crucian, Kenneth M Heilman

  • 1Department of Neurology, University of Florida College of Medicine, Gainesville, FL, USA.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|August 17, 2006
PubMed
Summary

Right-handed individuals show a motor bias, with their right hand moving closer to the body than the left. This finding supports a proximal motor bias linked to the left hemisphere, influencing hand positioning during bimanual tasks.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Motor Behavior

Background:

  • Previous research indicates a left hemisphere visual attentional bias towards the body.
  • Left hemisphere functions, like reading, often occur in proximal (peripersonal) space.
  • Right-handed individuals tend to position their right hand closer to the body during bimanual tasks.

Purpose of the Study:

  • To investigate the hypothesis of a proximal motor bias in the right hand compared to the left hand in right-handed individuals.
  • To determine if motor execution, like drawing, reveals a hand-specific bias towards the body.

Main Methods:

  • Blindfolded, right-handed participants drew horizontal lines with both their left and right hands.
  • Lines were drawn on paper positioned in front of the subjects.

Related Experiment Videos

  • Deviation from the coronal plane was measured to quantify hand proximity to the body.

    • Main Results:

    • The right hand deviated significantly closer to the body than the left hand.
    • This finding was consistent across participants, supporting a directional motor bias.

    Conclusions:

    • The results support the existence of a proximal motor bias for the right hand, in addition to a known attentional bias.
    • This motor bias, associated with the left hemisphere-right hand, may explain hand positioning during bimanual tool use.