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Related Experiment Videos

Hemispheric asymmetry and interhemispheric transfer in reaching programming.

J L Velay1, S Benoit-Dubrocard

  • 1Lab. Neurobiologie Intégrative et Adaptative, UMR CNRS 6562, Université de Provence, Marseille, France. velay@newsup.univ-mrs.fr

Neuropsychologia
|July 30, 1999
PubMed
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Right-handed individuals show faster motor processes in the right hemisphere during pointing movements. Interhemispheric transfer is symmetrical in healthy individuals but impaired in those with callosal damage.

Area of Science:

  • Neuroscience
  • Motor Control
  • Human Physiology

Background:

  • Investigating intrahemispheric and interhemispheric processes during motor programming.
  • Examining hand and visual field effects on pointing movements.

Observation:

  • Right-handed subjects exhibited faster reaction times (RTs) with their left hand, suggesting a right hemisphere advantage for motor or visuomotor processes.
  • Left-handed subjects did not display a hand-related difference in RTs.
  • Both handedness groups responded faster when the visual target was in the homolateral visual field (uncrossed condition) compared to the contralateral visual field (crossed condition).
  • Interhemispheric transfer time was symmetrical in healthy participants, regardless of direction.

Findings:

  • A left-handed subject with a posterior callosal lesion showed significantly slower RTs and asymmetrical interhemispheric transfer, with normal right-to-left transfer but impaired left-to-right transfer.

Related Experiment Videos

  • The findings suggest that the corpus callosum plays a crucial role in interhemispheric communication for motor control.

    • Implications:

    • Understanding hemispheric specialization and the role of the corpus callosum in motor programming.
    • Potential insights into neurological conditions affecting interhemispheric communication.
    • Informing rehabilitation strategies for individuals with brain injuries impacting motor control.