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Related Experiment Video

Updated: May 31, 2026

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane
07:24

Using Eye-tracking to Assess the Relative Importance of Visual and Vestibular Input to Subcortical Motion Processing in the Roll Plane

Published on: August 22, 2025

Quick phases control ocular torsion during smooth pursuit.

Bernhard J M Hess1, Jakob S Thomassen

  • 1Neurology Dept., Univ. Hospital Zurich, Zurich CH-8091, Switzerland. bhess@neurol.uzh.ch

Journal of Neurophysiology
|July 1, 2011
PubMed
Summary

Researchers studied three-dimensional eye movements in primates tracking curved paths. They found small, rapid eye movements (quick phases) interrupt smooth pursuit, helping maintain visual stability by minimizing torsional disturbances.

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Area of Science:

  • Neuroscience
  • Oculomotor Control
  • Vision Science

Background:

  • Oculomotor control aims to stabilize gaze during visually guided eye movements.
  • A key question is whether smooth pursuit can maintain eye torsional stance during curvilinear paths.

Purpose of the Study:

  • To investigate if smooth pursuit eye movements along curvilinear paths can be achieved without altering the eye's torsional stance.
  • To analyze the role of quick phases in three-dimensional eye movements during circular tracking.

Main Methods:

  • Experimental study of three-dimensional eye movements in subhuman primates (Macaca mulatta).
  • Tracking of targets along circular and elliptical paths at various angular eccentricities and spatial frequencies.
  • Kinematic analysis of eye rotation based on recorded angular eye velocity.

Main Results:

  • Smooth pursuit eye movements along curvilinear paths were interrupted by small quick phases (<1.5° amplitude).
  • These quick phases occurred every few hundred milliseconds and changed direction based on tracking direction (clockwise/counterclockwise).
  • Reverse computations indicated quick phases facilitate ocular orientation control in the roll plane, minimizing visual field disturbances.

Conclusions:

  • Quick phases during curvilinear smooth tracking help minimize deviations from Donders' law.
  • These phases are crucial for maintaining torsional stability of the eye during complex eye movements.
  • The findings provide insights into the mechanisms underlying precise oculomotor control.