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Quantification of Visual Feature Selectivity of the Optokinetic Reflex in Mice
Published on: June 23, 2023
Induced motion and optokinetic afternystagmus: parallel response dynamics with prolonged stimulation
1Institute of Space and Terrestrial Science, York University, North York, Ontario, Canada.
Vision Research
|January 1, 1988
Summary
Illusory motion of a visual target during optokinetic stimulation is linked to eye movement control signals. Both illusory motion and optokinetic afternystagmus change in parallel, suggesting a shared underlying mechanism for stable visual fixation.
Area of Science:
- Neuroscience
- Vision Science
- Perception
Background:
- Optokinetic nystagmus (OKN) is an involuntary eye movement stabilizing gaze on a moving object.
- Illusory motion (IM) can occur when a stationary target appears to move due to background motion.
- Fixating a target during background motion attenuates OKN and can induce IM.
Purpose of the Study:
- To investigate the relationship between illusory motion (IM) and optokinetic reflexes.
- To test the hypothesis that IM arises from efferent signals for ocular pursuit opposing OKN signals.
- To examine how fixation affects IM and optokinetic afternystagmus (OKAN).
Main Methods:
- Participants fixated a stationary target while background contours moved.
- Magnitude of illusory motion (IM) and optokinetic afternystagmus (OKAN) were measured during and after optokinetic stimulation.
- Stimulation was performed with and without target fixation.
Main Results:
- Leftward IM magnitude and rightward OKAN slow-phase velocity increased and decayed at similar rates.
- Both IM and OKAN showed deeper decay after stimulation with fixation compared to without fixation.
- Retinal image motion and vection did not explain the observed IM.
Conclusions:
- The findings support the hypothesis that IM is related to efferent signals for ocular pursuit.
- Parallel changes in IM and OKAN suggest a shared neural mechanism for visual stabilization.
- Fixation plays a crucial role in modulating both IM and OKAN responses.
