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Related Experiment Videos

[Left unilateral apraxia].

Y Nakagawa1, H Tanabe, Y Ohigashi

  • 1Third Division Medical Science for Health, Faculty of Health and Sport Sciences, Osaka University.

Rinsho Shinkeigaku = Clinical Neurology
|January 1, 1991
PubMed
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A brain injury caused left unilateral apraxia, a deficit in skilled movements of the non-paralyzed left hand, despite intact object recognition. This case highlights the role of the corpus callosum in interhemispheric communication for motor control.

Area of Science:

  • Neuroscience
  • Cognitive Neurology
  • Neurorehabilitation

Background:

  • Head injury can lead to complex neurological deficits, including apraxia.
  • Unilateral apraxia, particularly affecting the non-paralyzed limb, is less understood than bilateral forms.

Observation:

  • A patient with a left frontal lobe lesion and corpus callosum thinning developed severe aphasia, right hemiparesis, and left unilateral apraxia.
  • The patient exhibited content errors in object use tasks with the left hand, suggesting a conceptual deficit.
  • Neuroimaging revealed hypoperfusion in the left temporo-parietal region, extending beyond MRI-detected lesions.

Findings:

  • Left unilateral apraxia, characterized by content errors, was observed in the patient's non-paralyzed left hand.
  • The findings suggest a conceptual deficit (ideational apraxia) rather than a purely motor planning issue.

Related Experiment Videos

  • Corpus callosum disconnection is implicated in the inability to utilize learned motor engrams in the left hemisphere with the left hand.

    • Implications:

    • This case underscores the critical role of the corpus callosum in interhemispheric transfer of motor information.
    • Understanding unilateral apraxia is crucial for targeted neurorehabilitation strategies.
    • The study contributes to the understanding of ideational apraxia and its underlying neural mechanisms.