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Objective: We investigated the effect of the passenger head-tilt strategy onthe severity of carsickness in lateral acceleration situations in automobiles.Background: It is well known that the driver is generally less susceptible tocarsickness than are the passengers. However, it is also known that the drivertilts his or her head toward the curve center when negotiating a curve, whereasthe passenger's head moves in the opposite direction. Therefore, wehypothesized that the head-tilt strategy has the effect of reducing theseverity of carsickness. Method: A passenger car was driven on a quasi-ovaltrack with a pylon slalom while the participant sat in the navigator seat. Theexperiment was terminated when either the participant felt the initial symptomsof motion sickness or the car finished 20 laps. In the natural head-tiltcondition, the participants were instructed to sit naturally, to relax, and notto oppose the lateral acceleration intentionally. In the active head-tiltcondition, the participants were asked to tilt their heads against thecentrifugal acceleration, thus imitating the driver's head tilt. Results: Thenumber of laps achieved in the active condition was significantly greater thanthat in the natural condition. In addition, the subjective ratings of motionsickness and symptoms in the active condition were significantly lower thanthose in the natural condition. Conclusion: We suggest that an active head tiltagainst centrifugal acceleration reduces the severity of motion sickness.Application: Potential applications of this study include development of amethodology to reduce carsickness.

human factors

Can Passenger's Active Head Tilt Decrease The Severity of Carsickness? -  Effect of Head Tilt on Severity of Motion Sickness in a Lateral Acceleration  Environment