Abstract
Although autonomic reactions by vestibular stimulation are supposed to be induced by the vestibulo-autonomic reflex, this mechanism has yet to be fully elucidated. Therefore, I thought hard about this from imbalance and vomiting. The relationship between the vestibular organs and autonomic nervous system was thus examined. There seemed to be input not only from vestibular organs, eyes and proprioceptor but also from internal organs to the central nervous system, when acceleration was induced. If the system controlled the input, then no symptoms might occur. If the somatic nervous system didn't control it, then an equilibrium disturbance and the sensation of dizziness might exist. On the other hand, when the autonomic nervous system lost control of it, nausea, vomiting and so on might occur. I considered that autonomic reactions by vestibular stimulation, which was based on imbalance, were influenced by the input from internal organs, and that motion stickness also had the same mechanism.
