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Related Experiment Video

Updated: Jun 20, 2026

Eye-Tracking Control to Assess Cognitive Functions in Patients with Amyotrophic Lateral Sclerosis
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Using fast eye movements to study fatigue in multiple sclerosis.

M Matta1, R J Leigh, M Pugliatti

  • 1Clinical Neurology, Department of Neuroscience, University of Sassari, Italy.

Neurology
|September 10, 2009
PubMed
Summary
This summary is machine-generated.

Internuclear ophthalmoparesis (INO) in multiple sclerosis (MS) patients showed worsening eye movement disconjugacy with fatigue. This suggests INO may model fatigue mechanisms in MS, potentially revealing therapeutic targets.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurology

Background:

  • Fatigue is a poorly understood symptom in multiple sclerosis (MS).
  • Internuclear ophthalmoparesis (INO), caused by demyelination of the medial longitudinal fasciculus (MLF), affects eye movements.

Purpose of the Study:

  • To determine if INO serves as a model for studying MS-related fatigue.
  • To investigate if repetitive saccades exacerbate eye movement disconjugacy in MS patients with INO.

Main Methods:

  • Compared horizontal saccade conjugacy in 9 MS patients with INO and 8 controls.
  • Measured versional disconjugacy index (VDI) during a fatigue test (minute 1 vs. minute 10).
  • Assessed the ratio of abducting/adducting peak velocity.

Main Results:

  • Patients with INO exhibited greater VDI than controls.
  • Controls showed no change in VDI during the fatigue test.
  • 10 out of 13 INOs showed significant VDI changes with fatigue (p < 0.005).

Conclusions:

  • Fatigue worsened eye movement conjugacy in milder INO cases, suggesting impaired neural transmission along the MLF.
  • More severe INOs showed improved conjugacy, possibly due to adaptive mechanisms.
  • INO offers a model to study neural transmission, fatigue adaptation, and potential therapeutics in MS.