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Saccadic adaptation in Chiari type II malformation.

Michael S Salman1, James A Sharpe, Moshe Eizenman

  • 1Division of Neurology, The Hospital for Sick Children, Toronto, ON.

The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques
|December 16, 2006
PubMed
Summary

Children with Chiari type II malformation (CII) demonstrate intact saccadic adaptation, a motor learning process. This suggests the neural circuits responsible for this eye movement adaptation are functional in CII.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Developmental Disorders

Background:

  • Saccadic adaptation is a key mechanism for correcting eye movement errors and studying motor learning.
  • The cerebellum plays a crucial role in saccadic adaptation.
  • Chiari type II malformation (CII) is a congenital cerebellar and brainstem deformity linked to spina bifida.

Purpose of the Study:

  • To investigate the impact of Chiari type II malformation (CII) on saccadic adaptation.
  • To determine if the neural circuits underlying saccadic adaptation are affected in individuals with CII.

Main Methods:

  • Eye movements were recorded using infrared oculography in 21 children with CII and 39 typically developing children (ages 8-19).
  • Saccadic adaptation was induced by experimentally shifting target locations during saccades.

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Last Updated: Jul 18, 2026

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Main Results:

  • Both CII and control groups successfully adapted saccadic amplitude.
  • Saccadic gain reduction was comparable between groups (6.9% in CII vs. 9.3% in controls, p=0.27).
  • Reduced adaptation was noted in CII participants with multiple shunt revisions; no effect of lesion level, nystagmus, or vermian dysmorphology was found.

Conclusions:

  • The neural circuits mediating saccadic adaptation appear to be functionally preserved in individuals with Chiari type II malformation.
  • Saccadic adaptation is a robust process not significantly impaired by CII.