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Related Experiment Videos

Optic ataxia errors depend on remapped, not viewed, target location.

A Z Khan1, L Pisella, A Vighetto

  • 1Espace et Action, Institut National de la Santé et de la Recherche Médicale, U534, Institut Fédératif des Neurosciences Lyon, 16 avenue Doyen Lépine, 69676, Bron, France.

Nature Neuroscience
|March 16, 2005
PubMed
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Optic ataxia, a disorder from posterior parietal lobe damage, causes errors in visually guided reaching. These errors are not due to faulty sensorimotor transformation but a dynamic, gaze-centered internal representation of reach space.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurobiology

Background:

  • Optic ataxia is characterized by visually guided reaching errors, typically in the peripheral visual field.
  • These deficits are often linked to lesions in the posterior parietal lobe.
  • Previous theories proposed faulty sensorimotor transformation of visual input from the affected visual field.

Purpose of the Study:

  • To investigate the underlying mechanisms of visually guided reaching errors in optic ataxia.
  • To challenge the assumption of faulty sensorimotor transformation as the sole cause of these errors.
  • To explore the role of internal representations in optic ataxia.

Main Methods:

  • Analysis of reaching behavior in patients with optic ataxia.
  • Examination of visual field deficits and their correlation with reaching accuracy.

Related Experiment Videos

  • Modeling of internal spatial representations during reaching tasks.

    • Main Results:

    • Optic ataxia patients exhibit reaching errors in the contralesional visual field.
    • These errors are dependent on a dynamic, gaze-centered internal representation of reach space.
    • Evidence suggests that the spatial representation, not just sensorimotor transformation, is impaired.

    Conclusions:

    • The visually guided reaching errors in optic ataxia are critically influenced by a dynamic gaze-centered internal representation of reach space.
    • This finding reframes the understanding of sensorimotor deficits in posterior parietal lobe disorders.
    • Future research should focus on the neural basis of these dynamic spatial representations.