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Ultralow vestibuloocular reflex time constants.

R W Baloh1, K Beykirch, P Tauchi

  • 1Department of Neurology, California at Los Angeles School of Medicine 90024-1769.

Annals of Neurology
|January 1, 1988
PubMed
Summary
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Patients with central nervous system lesions showed reduced vestibuloocular reflex (VOR) time constants. This impaired VOR function, particularly at low frequencies, impacting balance and eye movement control.

Area of Science:

  • Neurology
  • Ophthalmology
  • Neuroscience

Background:

  • The vestibuloocular reflex (VOR) stabilizes gaze during head movements.
  • A normal VOR time constant is crucial for maintaining eye position and visual stability.
  • Central nervous system lesions can significantly affect VOR function.

Purpose of the Study:

  • To investigate oculomotor function in patients with central nervous system lesions and decreased VOR time constants.
  • To characterize the impact of reduced VOR time constants on various eye movement parameters.
  • To explore potential neural mechanisms underlying VOR time constant reduction.

Main Methods:

  • Detailed oculomotor assessments were performed on 3 patients.
  • Serial measurements of postrotatory nystagmus duration were conducted over 3 years in one patient.

Related Experiment Videos

  • VOR gain and phase were evaluated using caloric stimulation and sinusoidal rotation at different frequencies.
  • Gaze holding, saccades, smooth pursuit, and optokinetic nystagmus were assessed.

    • Main Results:

    • One patient with Chiari type I malformation exhibited a progressive decrease in VOR time constant, leading to absent nystagmus and lack of response to low-frequency stimuli.
    • This patient maintained normal VOR gain at higher frequencies but showed increased phase lead.
    • The other two patients with brainstem-cerebellar atrophy presented with impaired gaze holding, abnormal smooth pursuit and optokinetic nystagmus, and absent optokinetic-after-nystagmus.
    • Increased VOR gain to step and high-frequency stimuli was observed in these patients.

    Conclusions:

    • Reduced VOR time constants in central nervous system lesions can lead to significant deficits in vestibular compensation.
    • The findings suggest a potential impairment in the neural mechanisms responsible for prolonging the VOR time constant.
    • These oculomotor abnormalities highlight the complex interplay between central nervous system integrity and vestibular function.