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[Difficulty in manual prehension under visual control (author's transl)]

P Rondot, J de Recondo

    Annales De Medecine Interne
    |August 1, 1978
    PubMed
    Summary
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    Visuomotor ataxia impairs object grasping under visual guidance. This condition involves specific visual field deficits and can manifest as direct or crossed hand-eye coordination issues.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Neurology

    Background:

    • Visuomotor ataxia is a neurological condition affecting visually guided movements.
    • It is characterized by difficulties in object prehension without paralysis or spatial agnosia.

    Observation:

    • The condition can affect the entire visual field or specific half-fields (right or left).
    • It may impact one or both hands.
    • Unilateral visuomotor ataxia affects homonymous half-fields, with direct (ipsilateral) or crossed (contralateral) hand-field relationships.
    • Bilateral visuomotor ataxia involves the whole visual field, presenting direct or crossed patterns.

    Findings:

    • The study details direct and crossed visuomotor connections.
    • These connections link visual processing to motor control for object grasping.

    Related Experiment Videos

  • Evidence suggests crossed connections traverse the corpus callosum.

    • Implications:

    • Understanding these visuomotor pathways is crucial for diagnosing and treating ataxia.
    • This research sheds light on the neural basis of visually guided hand movements.
    • Findings contribute to the broader understanding of sensorimotor integration in the brain.