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Visually induced vertical vergence as a motion processing biomarker associated with postural instability.

Maiar Sukkar1, Amirehsan Khatirnamani1, Tobias Wibble1

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Summary
This summary is machine-generated.

Visually induced vertical vergence (VIVV) acts as a non-specific motion processing response. This eye movement biomarker correlates with pupil size and body sway, indicating stress and postural instability.

Keywords:
Dorsal light reflexEye-trackingMotion processingVergenceVisuo-vestibular

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Human Physiology

Background:

  • Visually induced vertical vergence (VIVV) is explored as a potential non-specific indicator of motion processing.
  • Understanding VIVV's role in response to optokinetic stimuli is crucial for interpreting visual-motor integration.
  • Previous research has not fully elucidated VIVV's correlation with other physiological responses like pupil size and postural sway.

Purpose of the Study:

  • To investigate visually induced vertical vergence (VIVV) as a response to optokinetic stimuli across different motion dimensions.
  • To analyze the correlation between VIVV, pupil-size changes, and postural sway during optokinetic stimulation.
  • To determine if VIVV can serve as a biomarker for visual motion processing, postural instability, and stress.

Main Methods:

  • Healthy participants were exposed to optokinetic stimuli (yaw, pitch, roll, radial optic flow) using a virtual reality headset.
  • Measurements included visually induced vertical vergence (VIVV), pupil-size, and postural sway.
  • Data analysis involved normalizing VIVV amplitudes and correlating them with changes in pupil-size and body sway.

Main Results:

  • Optokinetic stimuli successfully induced VIVV, with significant responses observed across yaw, pitch, and radial optic flow conditions.
  • VIVV magnitudes demonstrated a universal correlation with concurrent changes in pupil-size and body sway.
  • All measured parameters (VIVV, pupil-size, body sway) were affected by alterations in optokinetic stimulus direction.

Conclusions:

  • Visually induced vertical vergence (VIVV) is expressed across all tested visual motion dimensions, supporting its role as a visual motion processing biomarker.
  • VIVV is associated with increased postural instability and physiological stress, potentially acting similarly to a dorsal light reflex.
  • The findings suggest VIVV can be a valuable indicator of the body's response to visual motion, even without direct binocular engagement.