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Related Experiment Videos

Posterior internal capsule infarction associated with neglect.

J M Ferro, A Kertesz

    Archives of Neurology
    |April 1, 1984
    PubMed
    Summary
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    A patient developed persistent hemispatial neglect after a right internal capsule infarction. This akinesia, likely due to pulvinar-parietal disconnection, affected motor tasks, especially with visual control.

    Area of Science:

    • Neuroscience
    • Neurology
    • Cognitive Science

    Background:

    • Hemispatial neglect is a neurological disorder characterized by a failure to respond to stimuli on one side of space.
    • Internal capsule lesions, particularly the posterior limb, are known to cause motor deficits, but the specific mechanisms of neglect are complex.

    Observation:

    • A patient presented with persistent hemispatial neglect following a small infarction in the posterior limb of the right internal capsule.
    • The neglect primarily impacted spontaneous motor performance in the contralateral hemispace, particularly under visual guidance.
    • Notably, the patient did not exhibit extinction, and verbal cues improved exploratory behavior, suggesting an intentional disorder.

    Findings:

    • The observed hemispatial akinesia was linked to an intentional disorder rather than sensory extinction.

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  • A likely anatomical basis identified was a pulvinar-parietal disconnection.
  • This disconnection impaired the right parietal cortex's access to visuospatial information from the contralateral hemispace.

    • Implications:

    • This case highlights the specific role of the pulvinar-parietal pathway in visuospatial attention and motor intentionality.
    • Understanding such specific disconnections can refine diagnostic approaches to hemispatial neglect.
    • Findings contribute to the neural basis of spatial awareness and motor control in neurological disorders.