ABSTRACT
Seasickness, coach sickness, car sickness, airsickness, or even space sickness is phenomena that have been experienced by most travelers. These can be broadly categorized as different forms of motion sickness. The common root of the words "nautical" and "nausea" indicates the long association of motion sickness with travel in general, and sea travel in particular. In contrast to air and sea travel where the motion includes vertical low-frequency components, ground transportation is dominated by lateral acceleration at low frequencies. Simulators are used for civilian applications ranging from transportation to medical applications, through to providing a virtual model of a new structure. For fore-and-aft oscillation, some experimental investigations have used constant acceleration across a variety of frequencies, whereas others have used constant velocity. Motion sickness had been attributed to a variety of theories before the theory of sensory conflict was accepted. These were broadly categorized as psychological and physiological.
