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A mathematical model of motion sickness incidence (MSI) is derived byintegrating neurophysiological knowledge of the vestibular system to predictthe severity of motion sickness of humans. Bos et al. proposed the successfulmathematical model of motion sickness based on the neurophysiological mechanismbased on the subject vertical conflict (SVC) theory. We expand this model to6-DOF motion, including head rotation, by introducing the otolith-canalinteraction. Then the model is applied to an analysis of passengers' comfort.It is known that the driver is less susceptible to motion sickness than are thepassengers. In addition, it is known that the driver tilts his/her head towardthe curve direction when curve driving, whereas the passengers' head movementis likely to occur in the opposite direction. Thus, the effect of the head tiltstrategy on motion sickness was investigated by the proposed mathematicalmodel. The head movements of drivers and passengers were measured in slalomdriving. Then, the MSI of the drivers and that of the passengers predicted bythe proposed model were compared. The results revealed that the head movementtoward the centripetal direction has a significant effect in reducing the MSIin the sense of SVC theory.

A Mathematical Model of Motion Sickness in 6DOF Motion and Its Application to Vehicle Passengers