Behavior of dominant and non dominant arms during ballistic protractive target-directed movements |
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Authors: | A Zuoza A Skurvydas D Mickeviciene B Gutnik D Zouzene B Penchev S Pencheva |
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Institution: | (1) Bloorview Research Institute, 150 Kilgour Road, Toronto, ON, M4G 1R8, Canada;(2) Department of Psychology, University of Toronto, 100 St. George Street, Toronto, ON, M5S 3G3, Canada;(3) Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON, M5S 3G9, Canada |
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Abstract: | The purpose of this study is to investigate the asymmetry of dominant and non-dominant arms regarding reaction time (RT),
velocity, force and power generated during ballistic target-directed movements. Fifty six, right-handed young males performed
protractile movements with both arms separately by pushing a joystick towards a target-line as quickly and as accurately as
possible. Participants performed 21 repetitions with each hand. The temporal, spatial, kinetic and kinematic parameters were
computed. All movements were grouped regarding their accuracy (when joystick fell short, stopped precisely or overreached
the target). Each group of movements was analyzed separately and the data obtained was compared across groups.
The results showed that although the left arm was less accurate than the right one, it reached the target significantly faster,
developing greater average force and power. The forces of acceleration and deceleration of the left arm were greater too.
We did not observe a significant lateral difference in RT in situations when the arm fell short of the target, or stopped
precisely on the target. It was only when the target was overreached that the left arm displayed a significantly greater RT
than the right one. We explain the results from the asymmetry of motor behavior in favor of the influence of both hemispheres
in this process. |
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Keywords: | |
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