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Related Experiment Video

Updated: May 31, 2026

MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions

MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions

Published on: May 10, 2012

Dynamic cyclovergence during vertical translation in humans.

Itsaso Olasagasti¹, Christopher J Bockisch, David S Zee

¹Department of Neurology, University Hospital Zurich, CH-8091 Zurich, Switzerland. miren.olasagasti@usz.ch

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|July 8, 2011

Summary

This summary is machine-generated.

Human eye movements during vertical acceleration reveal a paradoxical torsional response called cyclovergence. This study suggests two sources for this eye motion, potentially a remnant from our evolutionary past.

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Method to Measure Tone of Axial and Proximal Muscle

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Last Updated: May 31, 2026

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Published on: May 10, 2012

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Published on: December 14, 2011

Area of Science:

Neuroscience
Ophthalmology
Vestibular System

Background:

Humans exhibit torsional eye movements (cyclovergence) during vertical acceleration.
The underlying mechanisms and evolutionary origin of this response remain unclear.

Purpose of the Study:

To investigate the characteristics of cyclovergence during vertical linear motion.
To differentiate the sources contributing to this eye movement response.

Main Methods:

Healthy human subjects underwent sinusoidal vertical linear acceleration.
A head-fixed visual target minimized eye movements, isolating torsional components.
Cyclovergence was measured in response to frequencies between 1 and 2 Hz.

Main Results:

Cyclovergence showed a specific phase relationship with inertial acceleration (8.7 ± 2.4°).
Sensitivity of cyclovergence increased slightly with stimulus frequency.
The response characteristics differed from cycloversion during horizontal motion.

Conclusions:

Vertical translation-induced cyclovergence likely arises from two components: a low-frequency linear acceleration response and a high-pass 'dynamic cyclovergence'.
This human response may be an evolutionary vestige from animals with lateral-facing eyes adapting to vertical motion.