Less sickness with more motion and/or mental distraction.

Area of Science:

• Vestibular science
• Human factors engineering
• Neuroscience

Background:

• Motion sickness negatively impacts passenger comfort and crew performance.
• Current countermeasures, primarily medication, often cause undesirable side effects.

Purpose of the Study:

• To investigate the efficacy of adding inherent non-sickening vibration and mental distraction in reducing motion sickness.
• To quantify the combined and individual effects of these interventions.

Main Methods:

• Eighteen blindfolded subjects underwent off-vertical axis rotation (OVAR) with a vibrating headrest.
• Interventions (vibration, mental distraction task) were tested individually and in combination.
• Subjective sickness ratings and objective task performance were used to quantify effects.

Main Results:

• Head vibration reduced sickness by 25%, mental distraction by 19%, and their combination by 39%.
• Task performance was inversely correlated with sickness levels.
• Sixteen subjects completed the study under comparable conditions.

Conclusions:

• Low-frequency motion sickness can be effectively mitigated by high-frequency vibration and mental distraction.
• Vibration's effect may be explained by the central nervous system's internal model for motion control optimization.
• These non-pharmacological methods offer promising alternatives for managing motion sickness.