Some of the mechanisms underlying motion sickness

Some of the mechanisms contributing to the occurrence of motion sickness are discussed. It is stated that the primary factor is a loss of stability in the vestibular system caused by repetitive sensory inputs that are abnormal in terms of the central vestibular patterning encountered. Evidence is presented supporting the opinion that motion sickness is an epiphenomenon superimposed on any responses in the reflex category due to vestibular influences that cross a temporary linkage to reach nonvestibular sites where first-order motion sickness symptoms have their immediate origin.