Motion-induced interruptions and postural equilibrium in linear lateral accelerations.

Area of Science:

• Biomechanics
• Human Factors Engineering
• Motion Sickness Research

Background:

• Motion-induced interruptions (MIIs) are critical in understanding human stability.
• Previous research has explored the relationship between sway motion and MIIs.
• A clear understanding of factors influencing MII occurrence is needed.

Purpose of the Study:

• To re-evaluate the relationship between sway motion characteristics and MIIs.
• To investigate the impact of lateral motion frequency and acceleration on MIIs.
• To introduce and validate the concept of 'probable' MIIs.

Main Methods:

• Simulated lateral tipping motion experiments were conducted.
• Analysis focused on the frequency and acceleration of motion stimuli.
• A mathematical model was developed to predict MII occurrence.
• Comparison between 'definite' and 'probable' MIIs was performed.

Main Results:

• MIIs occurrence significantly correlates with peak sway acceleration.
• Sway frequency's effect on MIIs is less pronounced than acceleration.
• Complex multidirectional motions induce more tipping MIIs than unidirectional ones.
• 'Probable' MIIs were 16-67% more frequent than 'definite' MIIs.
• The developed model predicted observed MIIs with <9% error.

Conclusions:

• Sway acceleration and motion complexity are key factors in MII occurrence.
• The 'probable' MII concept refines the understanding of balance loss.
• Future research should integrate acceleration, frequency, and complexity.
• The mathematical model provides a reliable tool for MII prediction.