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Hemispheric differences in motor control.

M A Goodale1

  • 1Department of Psychology, University of Western Ontario, London, Canada.

Behavioural Brain Research
|September 15, 1988
PubMed
Summary
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The human brain's left hemisphere is crucial for organizing complex motor behaviors, including speech and visually guided movements. This hemisphere facilitates selecting and sequencing individual movements for coordinated actions.

Area of Science:

  • Neuroscience
  • Motor Control
  • Cerebral Lateralization

Background:

  • The role of the left hemisphere in complex motor behavior was initially proposed by Liepmann and later expanded by Kimura.
  • Existing research suggests specific hemispheric involvement in motor control, but the full extent is under investigation.

Purpose of the Study:

  • To present two lines of evidence supporting the left hemisphere's specialized role in organizing complex motor behavior in humans.
  • To investigate the left hemisphere's involvement in movement selection and sequencing, and its role in visually guided reaching.

Main Methods:

  • Analysis of right-sided asymmetries in mouth movements during verbal and non-verbal tasks.
  • Examination of eye and limb movements during visually guided reaching tasks.

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Main Results:

  • Observed right-sided asymmetries in mouth movements indicate left hemisphere mechanisms are key for selecting and transitioning between movements.
  • Visually guided reaching movements involving eye and limb coordination are also dependent on these left-hemisphere mechanisms.

Conclusions:

  • The findings support the hypothesis that the left hemisphere plays a specialized role in the organization of complex motor behaviors.
  • Speech is presented as one example of numerous motor patterns partially mediated by neural systems in the dominant (left) hemisphere.