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Related Experiment Videos

Task complexity and limb selection in reaching.

Carl Gabbard1, Mike Tapia, Casi Rabb Helbig

  • 1Department of Health and Kinesiology, Texas A&M University, College Station, TX 77843-4243, USA. c-gabbard@tamu.edu

The International Journal of Neuroscience
|May 20, 2003
PubMed
Summary

Task complexity influences limb selection for reaching and grasping. Increased processing demands may lead individuals to favor their dominant limb, even for contralateral movements, challenging simple ipsilateral bias theories.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Limb selection for reaching and grasping typically shows an ipsilateral bias.
  • This bias challenges traditional notions of handedness.
  • Task complexity's role in limb selection remains less understood.

Purpose of the Study:

  • To investigate how task complexity affects limb selection during reaching and grasping.
  • To examine if increased cognitive load alters the ipsilateral bias.

Main Methods:

  • Forty-four right-handed, blindfolded participants performed a two-stage reach-and-grasp task.
  • Task conditions varied the timing of location cues for grasping and releasing.
  • Limb choice was recorded for each condition.

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Main Results:

  • A strong ipsilateral bias was observed when the reach cue was in the right hemispace (96% dominant hand use).
  • When the reach cue was in the left hemispace, dominant hand use decreased significantly (40%).
  • This contralateral reach with the dominant limb was less frequent than in simpler tasks.

Conclusions:

  • Increased task complexity appears to reduce the ipsilateral bias in limb selection.
  • When cognitive processing demands are higher, individuals may revert to using their dominant limb, even for contralateral actions.
  • Findings suggest a nuanced interplay between task demands and motor programming for limb selection.