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Optic Flow Speed and Retinal Stimulation Influence Microsaccades.

Milena Raffi1, Aurelio Trofè2, Andrea Meoni1

  • 1Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126 Bologna, Italy.

International Journal of Environmental Research and Public Health
|June 10, 2022
PubMed
Summary

Optic flow speed influences microsaccades, particularly in the peripheral vision. This suggests that eye movement generation depends on where visual stimuli are perceived.

Keywords:
attentioneye movementseye positionself-motion perceptionsensorimotor controlvisual perceptionvisual processingvisual system

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Oculomotor Control

Background:

  • Microsaccades, small and rapid eye movements, are associated with extraretinal mechanisms influencing spatial perception.
  • Understanding the factors modulating microsaccadic activity is crucial for comprehending visual processing and eye movement generation.

Purpose of the Study:

  • To investigate the modulation of microsaccadic activity by the speed of radial optic flow stimuli.
  • To determine if optic flow speed differentially affects microsaccades depending on the stimulated retinal region (foveal, peripheral, or full field).

Main Methods:

  • Experiments involved 19 subjects fixating on a central point in darkness while exposed to full-field optic flow stimuli at varying dot speeds (8-20°/s).
  • Stimuli were presented in the foveal, peripheral, and full visual field to assess regional effects.
  • Microsaccade rate and latency were recorded and analyzed in response to different optic flow conditions and speeds.

Main Results:

  • Peripheral retinal stimulation consistently evoked the highest microsaccade rate across most tested speeds.
  • Combined effects of optic flow speed and stimulated retinal region were observed on microsaccade latency.
  • Microsaccadic activity was significantly modulated by optic flow speed, especially when stimuli engaged specific retinal areas.

Conclusions:

  • Optic flow speed modulates microsaccadic activity, with a notable impact in the peripheral visual field.
  • The findings suggest that the generation of eye movements is intricately linked to the specific retinal regions stimulated by visual input.