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Related Experiment Videos

Hand effects on mentally simulated reaching.

Carl Gabbard1, Diala Ammar, Luis Rodrigues

  • 1Texas A&M University, TAMU 4243, College Station, TX 77843-4243, USA. c-gabbard@tamu.edu

Human Movement Science
|October 22, 2005
PubMed
Summary

Right-handers showed no significant differences in simulated movement accuracy between visual fields. Left-handers, however, made more errors, suggesting a potential left-hemisphere advantage for simulated movement accuracy in right-handers.

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Area of Science:

  • Cognitive Neuroscience
  • Motor Control Research
  • Human Movement Science

Background:

  • Simulated movements, like actual actions, are primarily controlled by the brain hemisphere contralateral to the limb.
  • Previous research indicates a left-brain advantage for accuracy in simulated movements.
  • This suggests right-handers may possess an advantage over left-handers in simulated movement tasks.

Purpose of the Study:

  • To investigate the hypothesis that right-handers have an advantage over left-handers in simulated movement accuracy.
  • To compare the performance of right- and left-handers on perceived reachability judgments in different visual fields.

Main Methods:

  • Participants included strong right- and left-handers.
  • Tasks involved judging perceived reachability to visual targets presented for 150 ms.

Related Experiment Videos

  • Stimuli were presented in the midline, right-visual field (RVF), and left-visual field (LVF).

    • Main Results:

    • Right-handers showed no hemispheric or hand-use advantage in accuracy.
    • Left-handers exhibited no hemispheric advantage but a significant hand-effect favoring the non-dominant limb, particularly in the LVF.
    • Left-handers made significantly more errors across hemispace compared to right-handers.

    Conclusions:

    • The findings suggest a potential left-hemisphere advantage for simulated movement accuracy in right-handers.
    • A possible interference effect in left-handers may explain their increased error rates.
    • Handedness and hemispheric control interact in the perception of simulated movements.