Cyclovergence evoked by up-down acceleration along longitudinal axis in humans

I. Olasagasti, C. J. Bockisch, D. S. Zee, D. Straumann

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

We present results of a study of torsional eye movements evoked by earth-vertical accelerations along the subject's longitudinal axis. The earth-vertical stimulus leads to a gravito-inertial acceleration vector that changes magnitude but not direction. It can therefore be viewed as a dynamic change of the gravity level. Up-down oscillations induced relatively symmetric cyclovergence (0.6-2.2° peak-to-peak). Eyes intorted/extorted for higher/lower effective gravity. The phase of this modulation was small relative to chair acceleration. We contrast this behaviour to the dynamics of cycloversion in response to interaural acceleration, which shows a considerably larger phase lag. This strikingly different dynamics suggest a different processing of otolith signals during interaural and longitudinal stimulation.

Original languageEnglish (US)
Title of host publicationUsing Eye Movements as an Experimental Probe of Brain function A Symposium in Honor of Jean Buttner-Ennever
PublisherElsevier
Pages319-322
Number of pages4
ISBN (Print)9780444531636
DOIs
StatePublished - 2008

Publication series

NameProgress in Brain Research
Volume171
ISSN (Print)0079-6123

Keywords

  • disconjugate torsion
  • gravity
  • linear acceleration
  • orienting responses
  • otoliths

ASJC Scopus subject areas

  • Neuroscience(all)

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