1997 Volume 7 Issue 2 Pages 1-8
We move our body under various dynamic conditions when we play a sport oroperate a machine. In playing a sport often we have to make judgments in an instant, and so we sometimes perform in a different way from our image. It is said that we can get 70% of the information of our five senses from visual information. If illusions occur easily in our environment, we may lose our balance . For example, when we are in a train and gazing at another starting train, some people think our train is starting, whereas others think the other train is going . It is very important which imagination we have. If we think another train is beginning to start when our train is starting, we lose our balance. Even in the opposite case ; if we think our train is beginning to start when another train is going, we may lose our balance. In this paper we measured the movements of a human's center of gravity when he was gazing at a moving picture made by a personal computer in a darkroom . The resonance frequencies were measured in the case where subjects swayed from side to side, and the phase differences between picture vibration and human vibration were also measured. As a result, it was found that we tune in to the sway of picture, but don't continue to tune to it. In the first period we tune in to the picture, and then our movements are delayed step by step. Resonance frequencies exist between 0.1-0.3Hz, although they are different among individuals . The phase difference has the smallest value when we sway at a resonance frequency, and then the variance has also the smallest value.
