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Smooth pursuit dysfunction in Alzheimer's disease.

W A Fletcher1, J A Sharpe

  • 1Neuro-ophthalmology Unit, Toronto Hospital, Ontario, Canada.

Neurology
|February 1, 1988
PubMed
Summary

Alzheimer's disease impairs smooth pursuit eye movements, showing reduced gain and saccadic intrusions. This eye movement disorder quantifies motor dysfunction in Alzheimer's patients.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Neurology

Background:

  • Alzheimer's disease (AD) is a neurodegenerative disorder characterized by progressive cognitive decline.
  • Ocular motor abnormalities, including deficits in smooth pursuit eye movements, are increasingly recognized in AD.

Purpose of the Study:

  • To investigate and quantify smooth pursuit eye movement abnormalities in patients with Alzheimer's disease.
  • To determine if specific parameters of smooth pursuit can serve as biomarkers for motor dysfunction in AD.

Main Methods:

  • Magnetic search coil oculography was used to measure smooth ocular pursuit in 13 Alzheimer's disease patients and age-matched controls.
  • Sinusoidal target motion at various velocities and frequencies was employed to assess smooth pursuit gain and phase relationships.

Main Results:

  • Patients with Alzheimer's disease exhibited uniformly reduced smooth pursuit gain across all target velocities, indicating impaired steady-state gain.
  • Despite reduced gain, normal phase relationships suggested intact predictor mechanisms. However, pursuit gain decreased with increased target acceleration, pointing to a nonlinear saturation effect.
  • Large-amplitude saccadic intrusions disrupted smooth pursuit, with eye movements continuing despite significant foveal position errors.

Conclusions:

  • Smooth pursuit eye movement abnormalities, including reduced gain and saccadic intrusions, are significant motor deficits in Alzheimer's disease.
  • These quantifiable eye movement disorders may serve as objective measures of motor dysfunction in AD, aiding in diagnosis and monitoring disease progression.

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