Sensitization of Visually Induced Motion Sickness by Prior Provocative Physical Motion.

Area of Science:

• Vestibular science
• Neuroscience
• Human factors engineering

Background:

• Habituation to motion aids in desensitizing motion sickness and aiding vestibular rehabilitation.
• Sensitization, the opposite of habituation, has received less research attention.
• Understanding motion sensitization is crucial for managing sensory-induced disorders.

Purpose of the Study:

• To investigate the phenomenon of motion sensitization.
• To determine if provocative physical motion can increase susceptibility to visually induced motion sickness.
• To examine the duration and nature of this sensitization effect.

Main Methods:

• Fifty subjects were randomly assigned to either cross-coupled (C-C) motion or a control condition.
• Participants were exposed to a visual stimulus, followed by a motion exposure (C-C or control), and then a retest visual stimulus after a 15-minute or 2-hour interval.
• Motion exposures involved whole-body rotation with head tilts (C-C) or head tilts alone (control), with rotational velocity increasing progressively.

Main Results:

• Cross-coupled (C-C) motion significantly increased total motion sickness symptoms compared to the control condition.
• This heightened susceptibility to visually induced motion sickness persisted for up to 2 hours post-exposure.
• Sickness ratings mirrored the symptom scores, indicating a consistent sensitization effect.

Conclusions:

• Cross-coupled (C-C) motion induces a lasting sensitization to subsequent visual motion stimuli.
• This sensitization effect crosses sensory modalities and occurs subconsciously, persisting despite subjective recovery.
• Findings have implications for the use of visual technologies following exposure to provocative motion, particularly within hours.