出版社：Japan Society of Physical Education, Health and Sport Sciences
摘要：Supposing that the visual function may involve the timing action which plays indispensable role in sports, so the authors intended to solve the relations between visual function and timing action by mastering the kinetic visual acuity which evaluate an ability to make a clear vision to the moving visual object. The following results were obtained from 36 professional baseball players. 1) On the variation in timing error accompanied with the change of speed of visual target, timing error was bigger when speed was slow. Furthermore, inspecting the individuality, degree of timing error in the case of slow movement of visual target showed nearly constant though the movement becomes fast, whereas the values of timing error in the case of fast movement of visual target showed variation when the movement became slow down. Therefore, it was supposed to find a clue in considering the faculty of timing from the results of timing error in the case of slow movement. 2) On the determination of relationship between the timing error and kinetic visual acuity by comparison two groups of inferior and superior tiersolls in timing error, decrease in the value of kinetic visual acuity was less in the group of superior and persons who showed less timing error than in the group of inferior persons. So the noticeable correlation was observed between the supero-inferiority of timing error and that of kinetic visual acuity. 3) On the consideration of which the comparison was made in the groups of superior or inferior in the kinetic visual acuity upon timing error superior group in kinetic visual acuity showed rather less change in timing error than the inferior group in kinetic visual acuity. So there seemed remarkable correlation between two functions. 4) On the relationship between the supero-inferiority of the kinetic visual acuity and the timing error when the speed of the moving target changed, higher correlation with both functions was observed in the case of slow speed, it was supposed that the act of making clear vision to the moving visual object was important when the speed was slow.
