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Individual motion perception parameters and motion sickness frequency sensitivity in fore-aft motion.

Tugrul Irmak1, Ksander N de Winkel2, Daan M Pool3

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Individual motion sickness sensitivity varies greatly. A strong link was found between verticality perception and general motion sickness, suggesting personalized approaches are needed for motion sickness management.

Keywords:
Frequency sensitivityModellingMotion perceptionMotion sickness

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Area of Science:

  • Neuroscience
  • Human Factors
  • Vestibular System Research

Background:

  • Previous research suggests motion sickness sensitivity is linked to individual motion perception characteristics.
  • Understanding these individual differences is crucial for developing effective motion sickness countermeasures.

Purpose of the Study:

  • To investigate the relationship between individual motion perception (velocity storage and subjective vertical time constants) and motion sickness frequency responses.
  • To determine if cross-over frequency, derived from the Multi Sensory Observer Model (MSOM), correlates with motion sickness sensitivity.
  • To explore individual variability in motion sickness frequency responses.

Main Methods:

  • Participants' velocity storage and subjective vertical time constants were measured using Earth Vertical Axis Rotation (EVAR) and centrifugation.
  • Motion sickness frequency responses were assessed by exposing participants to sinusoidal fore-aft motions at various frequencies (0.15-0.5 Hz).
  • Sickness severity was quantified using the MIsery SCale (MISC) and the Motion Sickness Assessment Questionnaire (MSAQ).

Main Results:

  • No significant group-level effect of frequency on motion sickness was found, but substantial individual variability in frequency sensitivity was observed.
  • The frequency of peak motion sickness sensitivity did not correlate with velocity storage or subjective vertical time constants.
  • A strong positive correlation was found between the subjective vertical time constant and general motion sickness sensitivity (r = 0.74, p = 0.0006).

Conclusions:

  • Motion sickness frequency sensitivity is an individual characteristic.
  • The strong correlation between subjective vertical time constant and motion sickness highlights the importance of verticality perception in translational sickness.
  • Current group-averaged models of motion sickness may not fully capture individual responses.