Visual blur and motion sickness in an optokinetic drum.

Area of Science:

• Neuroscience
• Human Physiology
• Sensory Perception

Background:

• Motion sickness (MS) is often attributed to conflicting sensory information.
• Visual input, particularly from motion-sensitive retinal pathways, may be a significant factor in MS.
• This study investigated the role of visual blur in modulating sensory conflict and MS symptoms.

Purpose of the Study:

• To test the hypothesis that inducing blurred vision exacerbates motion sickness.
• To determine if blurred vision alters the relative influence of peripheral (magnocellular) versus foveal (parvocellular) visual input.
• To assess the impact of blurred vision on visual-vestibular conflict and self-motion perception (vection).

Main Methods:

• 15 participants viewed a rotating optokinetic drum through clear or frosted goggles.
• Participants completed the Simulator Sickness Questionnaire (SSQ) before and after exposure.
• Subjective sickness and visually induced self-motion perception (vection) were rated on a 0-10 scale.

Main Results:

• Postexposure SSQ scores were significantly higher in the blurred vision condition compared to the control.
• Oculomotor and disorientation subscale scores were notably elevated with blurred vision.
• Both overall sickness ratings and vection ratings were significantly increased when vision was blurred.

Conclusions:

• Visual blur appears to exacerbate motion sickness, likely due to altered visual pathway influences.
• The findings suggest that visual blur can intensify visual-vestibular conflict.
• Consideration of visual blur effects is important in environments that provoke motion sickness, such as vehicles.