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A new oculomotor model demystifies "Remarkable Saccades".

Stephen J Heinen¹, Arvind Chandna¹, Devashish Singh¹

¹The Smith-Kettlewell Eye Research Institute, San Francisco, CA, United States.

Vision Research

|July 7, 2026

Summary

This study introduces a new Hybrid Binocular Control (HBC) model for eye movements, challenging Hering's Law by proposing independent eye control and explaining "remarkable saccades" without a vergence signal.

Keywords:

Binocular eye movements Computational model saccades

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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Area of Science:

Oculomotor control
Computational neuroscience
Vision science

Background:

Hering's Law posits unitary conjugate and vergence signals for eye movements, guiding strabismus research.
Recent findings suggest asynchronous eye rotations challenge the unitary vergence signal concept.
Independent eye control theories fail to explain "remarkable saccades" observed during asymmetric vergence.

Purpose of the Study:

To present a novel computational architecture for binocular eye movement control.
To challenge the necessity of a unitary vergence signal in oculomotor control.
To explain the phenomenon of "remarkable saccades" through a new model.

Main Methods:

Developed a "Hybrid Binocular Control" (HBC) model incorporating independent pursuit controllers and a unitary conjugate saccade controller.
Simulated eye movements using the HBC model, analyzing its ability to generate specific saccade types.
Investigated the role of attentional gain in modulating behavioral variations within the model.

Main Results:

The HBC model successfully generates "remarkable saccades" as an emergent property.
Model outputs align well with observed remarkable saccade profiles and other saccade types.
Variable attentional gain in the model accounts for behavioral variations in remarkable saccades.

Conclusions:

The novel HBC architecture operates without a vergence signal, suggesting a re-evaluation of current oculomotor control theories.
The model provides insights into the interaction between conjugate and independent eye controller signals.
Findings inspire further research into neural oculomotor circuitry and asymmetric eye movements.