HOW DO SOMERSAULTERS LAND ON THEIR FEET
HOW DO SOMERSAULTERS LAND ON THEIR FEET
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DOI：
10.1037/0096-1523.18.4.1195
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发表时间：
1992-11-01
影响因子：
2.1
通讯作者：
REWT, D
中科院分区：
文献类型：
--
作者：
LEE, DN;YOUNG, DS;REWT, D
本文分析了蹦床运动员在睁眼和闭眼状态下前空翻后直立落地的身体动作，以检验制动和动作时机是如何联合控制的理论。在调节着陆时，必须通过伸展身体来减缓旋转，以便在脚撞击蹦床时达到直立。扩展线性制动的视觉控制理论，假设直立着陆是通过感知调节身体伸展来实现的，以便保持身体与直立的比率角度：角度变化率（角度的tau函数）与着陆时间成比例。这些数据支持这一假设，表明视觉提高了控制精度，并进一步论证了tau函数在感知调节行动中的价值。
Body movements of trampolinists landing upright from forward somersaults, with eyes open and closed, were analyzed to test a theory of how braking and timing of actions are conjointly controlled. In regulating landing, rotation has to be slowed by extending the body so that it reaches the upright just as the feet hit the trampoline. Extending a theory of visual control of linear braking, it was hypothesized that upright landing is achieved by perceptually regulating body extension so as to keep the ratio angle of body to upright: rate of change of angle (the tau function of the angle) proportional to time-to-landing. The data support the hypothesis, indicate that vision improves precision of control, and argue further for the value of the tau function in the perceptual regulation of action.