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Related Experiment Videos

Saccadic responses in patients with hemispheric stroke

A Catz1, S Ron, H Ring

  • 1Loewenstein Hospital, Raanana, Israel.

Documenta Ophthalmologica. Advances in Ophthalmology
|January 1, 1994
PubMed
Summary

Stroke patients show altered eye movements. Unilateral hemispheric stroke impacts saccadic characteristics, affecting contralateral and ipsilateral movements differently due to impaired neural signals.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurology

Background:

  • Unilateral hemispheric stroke can affect various neurological functions, including eye movement control.
  • Saccadic eye movements are crucial for visual exploration and are controlled by complex neural circuits.

Purpose of the Study:

  • To investigate the characteristics of saccadic eye movements in patients with unilateral hemispheric stroke.
  • To understand how cortical infarcts influence saccadic gain in contralateral and ipsilateral directions.

Main Methods:

  • Eye movements were recorded using a standard electro-oculogram technique.
  • Saccadic characteristics, specifically gain values, were analyzed in 15 patients with unilateral hemispheric stroke and compared to control subjects.

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Main Results:

  • Patients with cortical infarcts exhibited lower mean gain values for contralateral eye movements (away from the infarct).
  • Conversely, ipsilateral eye movements (towards the infarct) showed higher mean gain values in stroke patients (p < 0.025).

Conclusions:

  • Impairment of efferent neural signals from the stroke-affected hemisphere appears to alter saccadic control.
  • These signal changes may lead to decreased excitation of contralateral neural circuits and reduced inhibition of ipsilateral neural circuits within the brainstem saccade generator.