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Prediction of Motion Sickness Incidence: Modeling Efforts based on Human Physiology ABCD Meeting 2006 “Human Performance a...
Motion Sickness <ul><li>A general term that describes the discomfort and associated emesis (vomiting) induced by motion.  ...
Cause of motion sickness <ul><li>Neural mismatch theory </li></ul>Current sensory input Neural store Vestibular system Vis...
Motion Sickness Incidence (MSI) <ul><li>A common index of motion sickness severity. </li></ul><ul><li>The percentage of pe...
HFR model (1974) Model Characteristics Vertical Acceleration Only true motion MSI: % of people who vomit Two-hour nauseoge...
Proposed Model Characteristics <ul><li>Conceptually based on existing theories </li></ul><ul><li>Observer theory concepts ...
Proposed Model Assumptions <ul><li>Model input parameters </li></ul><ul><ul><li>Motion characteristics detected by the ves...
Current (2006) Model in Detail <ul><li>Proposed Model </li></ul><ul><li>Z-axis (Vertical Acceleration) </li></ul><ul><li>L...
Error Estimation Subsystem Oman (1982) Glasauer & Merfeld (1997) Bles et al.  (1998) Merfeld et al. (1993)
Visual System Sandini et al. (2001) Legend Independent variables Intermediate variables Dependent variables Neural Store
Current Model (2006) Adaptation Mechanism   in detail Predicted difference between sensory input and motion in the neural ...
Normalization & Linear Combination of 2 Sources of Error = MSI
Current Model(2006) in Detail
Predicted MSI Proposed Model Characteristics Vertical Acceleration MSI: % of people who vomit Two-hour nauseogenic period ...
Model Validation True Motion Settings Proposed model HFR model MSI Comparison between Proposed and HFR models 1 2 3
MSI Accumulation Characteristics Vertical Acceleration MSI: % of people who vomit Two-hour nauseogenic period Nauseogenic ...
MSI Habituation
MSI Habituation and Retention
Model significance  I. <ul><li>Parametric </li></ul><ul><li>Easily extended to various combinations of sensory cues </li><...
Model significance II. <ul><li>Modeled Motion sickness attributes </li></ul><ul><ul><li>The known systems contributing to ...
Future Research <ul><li>Include motion in 6 degrees of freedom </li></ul><ul><li>Further development of known physiologica...
<ul><li>Questions? </li></ul>
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Matsangas &amp; McCauley (2006) - Prediction of Motion Sickness Incidence: Modeling Efforts based on Human Physiology

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Abcd Presentation

  1. 1. Prediction of Motion Sickness Incidence: Modeling Efforts based on Human Physiology ABCD Meeting 2006 “Human Performance at Sea: Influence of Ship Motions on Biomechanics and Fatigue&quot; By Lieutenant P. Matsagas, M.Sc., Hellenic Navy [email_address] , [email_address] M.E. McCauley, Ph.D., Naval Postgraduate School [email_address]
  2. 2. Motion Sickness <ul><li>A general term that describes the discomfort and associated emesis (vomiting) induced by motion. </li></ul><ul><li>Effects are evident in numerous environments: </li></ul><ul><ul><li>Ships </li></ul></ul><ul><ul><li>Aircraft </li></ul></ul><ul><ul><li>Automobiles </li></ul></ul><ul><ul><li>Air-cushioned vehicles. </li></ul></ul>
  3. 3. Cause of motion sickness <ul><li>Neural mismatch theory </li></ul>Current sensory input Neural store Vestibular system Vision Proprioception Error signal
  4. 4. Motion Sickness Incidence (MSI) <ul><li>A common index of motion sickness severity. </li></ul><ul><li>The percentage of people who vomit when exposed to a nauseogenic environment. </li></ul>
  5. 5. HFR model (1974) Model Characteristics Vertical Acceleration Only true motion MSI: % of people who vomit Two-hour nauseogenic period Nauseogenic frequency range 0.05 – 0.7 [Hz] Central nauseogenic frequency 0.167 [Hz]
  6. 6. Proposed Model Characteristics <ul><li>Conceptually based on existing theories </li></ul><ul><li>Observer theory concepts </li></ul><ul><li>MSI based on: </li></ul><ul><ul><li>Gravity estimation error </li></ul></ul><ul><ul><li>Residual optical flow </li></ul></ul><ul><li>Linear and Time Invariant </li></ul><ul><li>Vertical sinusoidal motions </li></ul>
  7. 7. Proposed Model Assumptions <ul><li>Model input parameters </li></ul><ul><ul><li>Motion characteristics detected by the vestibular system and somatosensation </li></ul></ul><ul><ul><li>Motion characteristics detected by peripheral vision </li></ul></ul>
  8. 8. Current (2006) Model in Detail <ul><li>Proposed Model </li></ul><ul><li>Z-axis (Vertical Acceleration) </li></ul><ul><li>Linear </li></ul><ul><li>Time invariant </li></ul><ul><li>Stable </li></ul>
  9. 9. Error Estimation Subsystem Oman (1982) Glasauer & Merfeld (1997) Bles et al. (1998) Merfeld et al. (1993)
  10. 10. Visual System Sandini et al. (2001) Legend Independent variables Intermediate variables Dependent variables Neural Store
  11. 11. Current Model (2006) Adaptation Mechanism in detail Predicted difference between sensory input and motion in the neural store Sensory contents in Neural Store 1 2 3 Legend Independent variables Intermediate variables Dependent variables Neural Store
  12. 12. Normalization & Linear Combination of 2 Sources of Error = MSI
  13. 13. Current Model(2006) in Detail
  14. 14. Predicted MSI Proposed Model Characteristics Vertical Acceleration MSI: % of people who vomit Two-hour nauseogenic period Nauseogenic frequency range 0.05 – 0.6 [Hz] Central nauseogenic frequency 0.17 [Hz]
  15. 15. Model Validation True Motion Settings Proposed model HFR model MSI Comparison between Proposed and HFR models 1 2 3
  16. 16. MSI Accumulation Characteristics Vertical Acceleration MSI: % of people who vomit Two-hour nauseogenic period Nauseogenic frequency range 0.05 – 0.6 [Hz] Central nauseogenic frequency 0.17 [Hz]
  17. 17. MSI Habituation
  18. 18. MSI Habituation and Retention
  19. 19. Model significance I. <ul><li>Parametric </li></ul><ul><li>Easily extended to various combinations of sensory cues </li></ul><ul><li>Validated but not “tuned” </li></ul><ul><li>Precise </li></ul><ul><li>Etiologic </li></ul><ul><li>Linear and time invariant </li></ul>
  20. 20. Model significance II. <ul><li>Modeled Motion sickness attributes </li></ul><ul><ul><li>The known systems contributing to motion sickness </li></ul></ul><ul><ul><li>Neural Store model </li></ul></ul><ul><ul><li>Adaptation </li></ul></ul><ul><ul><li>“ Vection” settings for VRs </li></ul></ul>
  21. 21. Future Research <ul><li>Include motion in 6 degrees of freedom </li></ul><ul><li>Further development of known physiological systems’ models </li></ul><ul><li>Central Nervous System (CNS) non-linear characteristics </li></ul><ul><li>Increase ecological and external validity </li></ul>
  22. 22. <ul><li>Questions? </li></ul>

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