Any difference in between vision and feeling leads to a difference in perception and leads a defence reaction with symptoms that may include loss of alertness, stimulation of the vagal nerves to the heart and accompanying sickness. At the same time, the inner ear, the primary sense of balance, perceives movement relative to the external environment. The eyes perceive the external environment. Note also that in addition the labyrinthine system of the inner ear, there are many receptors involved including muscles and tendons that are sensitive to changes in movement, but these sensitive to inertial accelerations receptors are specifically less organized according to the Earth’s gravity. These two systems mean that motion sickness may be felt and not seen or not felt and seen or a combination of these two. The origin of this disorder is disharmony of perception, a conflict sensory, or better, a differential perception essentially between the inner ear (center of balance) and the view (what the eyes perceive). For instance, all astronauts are affected 15% of passengers travelling by car 12% of train commuters 15% of people travelling by plane 5% of divers and, anywhere between 1 and 100 % of seafarers, depending on the state of the sea and passenger’s health. Very common, it is nonetheless the cause of very uncomfortable and debilitating situations. Indeed, the only playing back motion pictures or not can be enough to trigger it. It’s still called motion sickness, because it concerns the full range of transport and even more with the moving images. The Most Classic symptoms are in The Loss of alertness, the occurrence of yawning, pallor, sweating, nausea, vomiting and other symptoms called “archaic”. This widespread trouble is well known under the name “seasick “.
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