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Related Experiment Videos

Extraocular proprioception is required for spatial localization in man

J Ventre-Dominey1, P F Dominey, M Sindou

  • 1INSERM Unité 94, Laboratoire Vision et Motricité, Bron, France.

Neuroreport
|June 17, 1996
PubMed
Summary
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Deafferentation of eye muscles impairs accurate manual pointing. Balanced proprioceptive input from ocular muscles is essential for precise visually guided movements in egocentric space.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Motor Control

Background:

  • Ocular proprioception, the sense of eye position, is crucial for motor control.
  • The trigeminal nerve (V) plays a role in transmitting sensory information from the eye.
  • Understanding the contribution of ocular proprioception to visually guided movements is important.

Purpose of the Study:

  • To investigate the impact of extraocular muscle deafferentation on manual pointing accuracy.
  • To determine the role of ocular proprioceptive input in visually guided movements.

Main Methods:

  • Studied five patients undergoing unilateral trigeminal nerve thermocoagulation for trigeminal neuralgia.
  • Assessed manual pointing performance to visual targets before and after surgery.

Related Experiment Videos

  • Correlated postsurgical corneal anesthesia (indicating ophthalmic branch involvement) with pointing deficits.

    • Main Results:

    • Patients with postsurgical corneal anesthesia showed significant deficits in manual pointing accuracy.
    • Pointing errors, both initial and final positions, were predominantly shifted towards the lesioned side.
    • These deficits were observed in the ipsilateral hemispace.

    Conclusions:

    • Balanced ocular proprioceptive inputs are necessary for accurate visually guided movements.
    • Deafferentation of extraocular muscles disrupts the egocentric representation of space, leading to pointing inaccuracies.
    • The findings support a model emphasizing the role of proprioception in motor control.