Abstract
Keywords - car sickness, onboard display, optokinetic stimulus, visuo-vestibular sensory conflict, circular vection
Onboard displays for automobiles are becoming widely used for rear-seat entertainment. However, it is likely that the incidence of car sickness is increasing owing to watching movies via such onboard displays in moving vehicles. This study proposes screen designs of onboard displays for reducing car sickness. The designs are based on the sensory conflict theory; they reduce the conflict of sensory information between the visual and vestibular systems so that the inducement of car sickness is inhibited. An experimental study showed that the designs reduced the severity of car sickness which was aggravated by watching displays by more than 70%.