Recognition was intended to “symmetrism” of the movement of eyes and head, in active self-spinning movement and, of passive spinning movement on the revolving chair. In active spinning, deviation of eyes first then followed in neck to the turning direction, as a starting action. In passive revolving however these appear in inversion, that is, deviation of eyes first then followed of neck to the opposite direction. These evidences was termed symmetrism (Spiegelbild) of the postural movements in motion. These characteristic differences between in active—and in passive movements may be surely observed not only in turning movement, but also in linear—or in rounding movements. It should be somewhat ignorable question as considering to the known fact that many kind of active turning exercises render valuable training for aviators which are necessiated exclusively passive movements. Solution of this question and ploblems of defensive postures for motion sickness and maximam effective postures for dynamic movements were attempted on foundation with a marked defferences of post-rotatoric nystagmus when the head and eyes have fixated towardes forhead, rotation and opposite direction.
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