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Updated: Jul 2, 2026

Method to Measure Tone of Axial and Proximal Muscle
Published on: December 14, 2011
Cyclovergence evoked by up-down acceleration along longitudinal axis in humans
I Olasagasti1, C J Bockisch, D S Zee
1Department of Neurology, Zurich University Hospital, Zurich, Switzerland. miren.olasagasti@usz.ch
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 degrees 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.
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