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Related Experiment Video

Updated: Mar 8, 2026

Video-oculography in Mice

Video-oculography in Mice

Published on: July 19, 2012

Sustained smooth pursuit eye movements with eye-induced reverse-phi motion.

Arthur Portron¹, Jean Lorenceau²

¹Ecole Normale Supérieure, PSL Research University, Département d'études cognitives, Laboratoire des Systèmes Perceptifs (LSP), Paris, Francearthur.portron@ens.fr.

Journal of Vision

|January 24, 2017

Summary

Smooth pursuit eye movements can be maintained longer when a flickering visual texture briefly occludes a moving target. Optimal maintenance occurs with flickering disks at 10-20 Hz and balanced contrast, suggesting a visual feedback mechanism.

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Area of Science:

Neuroscience
Vision Science
Ophthalmology

Background:

Smooth pursuit eye movements are crucial for tracking moving objects.
Target disappearance behind an occluder typically causes a rapid decline in pursuit gain and speed.

Purpose of the Study:

To investigate how occluder characteristics influence smooth pursuit maintenance after target disappearance.
To determine the optimal visual properties of an occluder for sustained smooth pursuit.

Main Methods:

Participants performed smooth pursuit eye movements towards a moving target that disappeared behind various occluders.
Occluders included textures of flickering disks with varied temporal frequencies, disk sizes, densities, and contrast distributions.
Eye movements were recorded to measure pursuit maintenance duration and accuracy.

Main Results:

A texture of flickering disks significantly improved smooth pursuit maintenance compared to other occluders.
Optimal pursuit maintenance was observed with flickering frequencies of 10 and 20 Hz.
Balanced contrast and specific temporal frequencies (above 5 Hz) of flickering disks facilitated sustained pursuit.

Conclusions:

Smooth pursuit can be maintained for extended periods when targets disappear behind specific flickering visual textures.
The findings suggest that eye-induced reverse-phi motion responses provide visual feedback to the pursuit system.
This feedback mechanism may enable the generation of smooth pursuit even without explicit target motion.