Effect of passengers' active head tilt and opening/closure of eyes on motion sickness in lateral acceleration environment of cars.
This study examined the effect of passengers' active head-tilt and eyes-open/eyes-closed conditions on the severity of motion sickness in the lateral acceleration environment of cars. In the centrifugal head-tilt condition, participants intentionally tilted their heads towards the centrifugal force, whereas in the centripetal head-tilt condition, the participants tilted their heads against the centrifugal acceleration. The eyes-open and eyes-closed cases were investigated for each head-tilt condition. In the experimental runs, the sickness rating in the centripetal head-tilt condition was significantly lower than that in the centrifugal head-tilt condition. Moreover, the sickness rating in the eyes-open condition was significantly lower than that in the eyes-closed condition. The results suggest that an active head-tilt motion against the centrifugal acceleration reduces the severity of motion sickness both in the eyes-open and eyes-closed conditions. They also demonstrate that the eyes-open condition significantly reduces the motion sickness even when the head-tilt strategy is used. Practitioner Summary: Little is known about the effect of head-tilt strategies on motion sickness. This study investigated the effects of head-tilt direction and eyes-open/eyes-closed conditions on motion sickness during slalom automobile driving. Passengers' active head tilt towards the centripetal direction and the eyes-open condition greatly reduce the severity of motion sickness.
a College of Information Science and Engineering , Ritsumeikan University , Kusatsu , Japan.
Takahiro
T
Wada
a College of Information Science and Engineering , Ritsumeikan University , Kusatsu , Japan.
Keigo
K
Yoshida
D000054:Acceleration; D000328:Adult; D001334:Automobile Driving; D001696:Biomechanical Phenomena; D053483:Eye Movement Measurements; D005133:Eye Movements / Q000502:physiology*; D019416:Head Movements / Q000502:physiology*; D006801:Humans; D008297:Male; D009041:Motion Sickness / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology / Q000517:prevention & control; D012107:Research Design
Motion sickness; carsickness; head tilt; lateral acceleration; open/closed eyes