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The quick-phase system.

David A Robinson1

  • 1Late Professor of Ophthalmology, Biomedical Engineering and Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, United States.

Progress in Brain Research
|January 25, 2022
PubMed
Summary
This summary is machine-generated.

Quick phases (QP) and saccades are rapid eye movements that use the same neural pathways but serve different functions. Research suggests both systems likely evolved to provide commands in head coordinates.

Keywords:
AlgorithmNystagmusQuick phaseVestibulo-ocular reflex

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Motor Control

Background:

  • Rapid eye movements, including saccades and quick phases (QP), are crucial for visual perception and maintaining gaze.
  • QP serve to reset eye position within the orbit, preventing movement beyond the oculomotor range, particularly during head turns.
  • Saccades are voluntary or reflexive eye movements that rapidly shift gaze between fixation points.

Purpose of the Study:

  • To investigate the coordinate system used by the neural circuits underlying quick phases (QP) and saccades.
  • To determine if the evolutionary origins of QP and saccadic systems suggest a common command framework.
  • To explore the functional differences and shared neural underpinnings of QP and saccades.

Main Methods:

  • Analysis of existing literature on the neural circuits and control mechanisms of rapid eye movements.
  • Comparative examination of the functional roles and evolutionary trajectories of QP and saccades.
  • Hypothesizing the coordinate system (e.g., head-centered vs. world-centered) based on observed movement patterns and evolutionary pressures.

Main Results:

  • Quick phases (QP) generally direct eye movements toward the direction of turning, bringing the visual scene into view more rapidly.
  • Algorithmic control of QP initiation and magnitude suggests an average movement aligned with the direction of turning.
  • Both the afoveate QP system and the saccadic system in foveate animals are reasonably assumed to provide commands in a head-coordinate system.

Conclusions:

  • The quick phase system likely evolved to provide commands in a head-coordinate system to facilitate gaze during head movements.
  • The saccadic system, evolving in foveate animals, appears to have been built upon the pre-existing head-coordinate framework of the QP system.
  • Shared neural circuits and inferred coordinate systems suggest a fundamental link in the control of these distinct rapid eye movements.