A Linear Physiological Visual-Vestibular A Linear Physiological Visual-Vestibular Interaction Model for the Prediction of Interaction Model for the Prediction of Motion Sickness Incidence: Motion Sickness Incidence: Adaptation and Habituation Issues Adaptation and Habituation Issues By By Lt P. Matsagas, M.Sc., Hellenic Navy, and Lt P. Matsagas, M.Sc., Hellenic Navy, and M.E. McCauley, Ph.D., Naval Postgraduate M.E. McCauley, Ph.D., Naval Postgraduate School School Human Systems Integration Symposium 2005 "Enhancing Combat Effectiveness Through Warfighter Performance"
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Matsangas And Mc Cauley (2005) Model For Predicting Motion Sickness, Adaptation Asne
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A Linear Physiological Visual-Vestibular A Linear Physiological Visual-Vestibular Interaction Model for the Prediction of Interaction Model for the Prediction of Motion Sickness Incidence:Motion Sickness Incidence:Adaptation and Habituation IssuesAdaptation and Habituation Issues
ByBy
Lt P. Matsagas, M.Sc., Hellenic Navy, andLt P. Matsagas, M.Sc., Hellenic Navy, and
Human Systems IntegrationSymposium 2005"Enhancing Combat EffectivenessThrough Warfighter Performance"
Motion SicknessMotion Sickness
Motion sickness is a general term that Motion sickness is a general term that describes the discomfort and associated describes the discomfort and associated emesis (vomiting) induced by many kinds of emesis (vomiting) induced by many kinds of motions. motions.
Motion sickness effects are evident in Motion sickness effects are evident in numerous provocative motion environments, numerous provocative motion environments, such as ships, aircraft, automobiles, and air-such as ships, aircraft, automobiles, and air-cushioned vehicles. cushioned vehicles.
Cause of motion Cause of motion sicknesssickness
Neural mismatch theoryNeural mismatch theory
Current sensory input
Neural store
Vestibular systemVision
ProprioceptionError signal
Effects on Effects on performanceperformance The consequences on human performance The consequences on human performance
and operational efficiency are:and operational efficiency are:– Ataxia (Ataxia (lack of muscular coordinationlack of muscular coordination))– Decreased spontaneityDecreased spontaneity– CarelessnessCarelessness– IncoordinationIncoordination– Reductions in subject motivationReductions in subject motivation– Mood changesMood changes– Sleepiness, drowsiness (through sopite Sleepiness, drowsiness (through sopite
syndrome)syndrome)
Motion Sickness Motion Sickness Incidence (MSI)Incidence (MSI) A historically common index of motion A historically common index of motion
sickness severity is the Motion sickness severity is the Motion Sickness Incidence (MSI), which is the Sickness Incidence (MSI), which is the percentage of people who vomit when percentage of people who vomit when exposed to a nauseogenic exposed to a nauseogenic environment. environment.
HFR model (1974)HFR model (1974)
Proposed modelProposed model
Conceptually based on existing theoriesConceptually based on existing theories Combined with observer theory conceptsCombined with observer theory concepts MSI estimation based on:MSI estimation based on:
Model input parametersModel input parameters– Vertical acceleration frequency and amplitudeVertical acceleration frequency and amplitude
Model OverviewModel Overview
Predicted MSIPredicted MSI
Model ValidationModel Validation
Model ValidationModel ValidationComparison plotComparison plot
MSI accumulationMSI accumulation
Adaptation to Adaptation to nauseogenic motionnauseogenic motion
MSI HabituationMSI Habituation
MSI Habituation and MSI Habituation and RetentionRetention
Model significanceModel significance
ParametricParametric Easily extended to various Easily extended to various
combinations of sensory cuescombinations of sensory cues Validated but not “tuned”Validated but not “tuned” PrecisePrecise EtiologicEtiologic Linear and time invariantLinear and time invariant
Why is the model Why is the model useful?useful? Current stateCurrent state
Future stateFuture state– True and apparent motion detectionTrue and apparent motion detection– ProprioceptionProprioception– Refinement of Neural Store modelRefinement of Neural Store model– Parametric input of other human physiology Parametric input of other human physiology
parametersparameters
Future ResearchFuture Research
Include motion in 6 degrees of Include motion in 6 degrees of freedomfreedom
Implementation of “all” physiological Implementation of “all” physiological systemssystems
Central Nervous System (CNS) non-Central Nervous System (CNS) non-linear characteristics linear characteristics
Gravity vector estimationGravity vector estimation Retinal SlipRetinal Slip Difference between true Difference between true motion and vectionmotion and vection