EEG correlates of subcortical optokinetic nystagmus

Szilvia Gulyás, László Pálvölgyi, Anita Kamondi, Imre Szirmai

Research output: Contribution to journalArticle

5 Citations (Scopus)


Objective: Our aim was to reveal the changes of concomitant scalp EEG activity during subcortical (stare-) optokinetic nystagmus (OKN). Methods: Stare-OKN of 10 subjects was evoked and recorded simultaneously with the EEG. Frequency distribution of OKN-beats was determined in each subject. Power changes of alpha and beta frequency bands of the EEG during OKN stimulation were statistically analysed. Results: During continuous subcortical OKN-the EEG alpha power decreased significantly while beta power increase was not significant. A significant transient alpha power enhancement around the onset of subcortical OKN-clusters was detected. Conclusions: We found significant changes in the parieto-occipital alpha EEG activity during subcortical OKN. The transient alpha synchronisation at the beginning of each OKN-cluster is a paradox phenomenon which might indicate increased visual attention. Significance: The present study is the first report investigating EEG changes related to subcortical OKN. Our findings suggest the involvement of cortical mechanisms in the generation of stare-OKN. The results might help in the elucidation of cortico-genicular mechanisms of ocular movements under physiological and pathological conditions.

Original languageEnglish
Pages (from-to)551-557
Number of pages7
JournalClinical Neurophysiology
Issue number3
Publication statusPublished - Mar 1 2007


  • Alpha synchronisation
  • Attention
  • EEG
  • Optokinetic nystagmus
  • Stare-nystagmus

ASJC Scopus subject areas

  • Sensory Systems
  • Neurology
  • Clinical Neurology
  • Physiology (medical)

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