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Cerebral dominance and asynchrony between bimanual two-dimensional movements
Journal of Experimental Psychology. Human Perception and Performance
|December 1, 1993
Summary
The dominant hand leads the non-dominant hand by 25 ms during bimanual movements, regardless of rhythm or direction. This intermanual asynchrony suggests lateralized brain timing mechanisms for coordinated actions.
Area of Science:
- Neuroscience
- Motor Control
- Human Movement Science
Background:
- Bimanual coordination is crucial for daily activities.
- Understanding intermanual timing and its neural basis is essential for motor control research.
Purpose of the Study:
- To investigate the temporal asynchrony between dominant and non-dominant hands during continuous bimanual movements.
- To explore factors influencing this asynchrony, including manual dominance, movement type, and rhythm.
Main Methods:
- Participants (right- and left-handers) traced ellipses with both hands simultaneously.
- Various combinations of rotation direction and rhythms were used.
- Passage times at homologous positions were compared to quantify asynchrony.
Main Results:
- The dominant hand consistently led the non-dominant hand by approximately 25 ms.
- This leading effect was independent of manual dominance, movement type, or rhythm.
- Variability in asynchrony changed along the trajectory, with distinct peaks and troughs.
- Variability profiles differed for homologous versus nonhomologous muscle engagement.
Conclusions:
- Bimanual movements may be timed by a lateralized neural module.
- Intermanual asynchrony likely results from interhemispheric information transfer delays.
- Movement variability suggests complex neural processing and feedback loops in bimanual coordination.