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Related Experiment Videos

A motion illusion generated by afternystagmus suppression.

A Chaudhuri1

  • 1Vision Center Lab, Salk Institute, San Diego, CA 92138-9216.

Neuroscience Letters
|October 2, 1990
PubMed
Summary

After smooth pursuit eye movements, stopping the target causes a perceived drift in the opposite direction. This visual illusion may stem from the brain’s motor commands to counteract eye drift.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Ophthalmology

Background:

  • Prolonged smooth pursuit eye movements can lead to aftereffects when the target motion stops.
  • These aftereffects include perceived target motion and continued eye drift (pursuit afternystagmus).

Purpose of the Study:

  • To investigate the proposed mechanism behind the motion illusion observed after smooth pursuit adaptation.
  • To explore the role of efferent motor signals in visual perception.

Main Methods:

  • Subjects performed prolonged unidirectional smooth pursuit eye movements.
  • The target was either stopped or extinguished during the post-adaptive period.
  • Eye movements and perceived motion were recorded.

Main Results:

  • When the target stopped, subjects perceived it drifting in the opposite direction of the prior pursuit.
  • When the target was extinguished, eyes continued to drift in the direction of the prior pursuit (pursuit afternystagmus).

Conclusions:

  • The visual system generates an efferent motor signal to counteract pursuit afternystagmus.
  • Perceptual registration of this efferent signal may cause the illusion of target motion.

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