The role of predictive visual temporal information in the coordination of muscle activity in catching
The role of predictive visual temporal information in the coordination of muscle activity in catching
复制标题
预测视觉时间信息在协调接球时肌肉活动中的作用
DOI：
10.1007/bf00229019
复制
发表时间：
2004
影响因子：
2
通讯作者：
R. Bartlett
中科院分区：
文献类型：
--
作者：
G. Savelsbergh;H. Whiting;A. Burden;R. Bartlett
本研究解决的问题，在单手接球任务中，在抓球时适当肌肉的预激活是启动和协调的信息的性质。记录高速胶片和肌电图，同时体验受试者（N= 4）抓住球-由球机以不同速度（11.9，13.9和16.2 m/s -分别导致508，443和355 ms的显著不同飞行时间）向他们投射。在每种速度下，计算每例受试者开始抓握运动时的Tau裕度（接触时间）值。在不同的速度下，没有发现牛磺马精之间的显着差异。此外，开始的肌肉活动的把握运动被证明是独立的球的速度。这些研究结果支持的论点，即在捕捉的把握运动的启动控制和协调的光学变量τ指定（直接）这个时间接触。考虑到所选择的肌肉群包括屈肌和伸肌，基于tau信息的共激活是有证据的。
This study addresses the question as to the nature of the information on which the preactivation of the appropriate muscles in the grasping of the ball in a onehanded catching task is initiated and coordinated. High speed film and electromyograms were recorded while experiences subjects (N= 4) caught balls — projected towards them by a ball-machine at different speeds (11.9, 13.9 and 16.2 m/s — resulting in significantly different flight times of 508, 443 and 355 ms, respectively). Tau-margins (times to contact) values were calculated at the time of the initiation of the grasp movement for each subject at each speed. No significant differences were found between taumargins at different speeds. Further, the onset of the muscle activity for the initiation of the grasp movement was shown to be independent of ball speed. These findings lend support to the contention that the initiation of the grasp movement in catching is controlled and coordinated by the optical variable tau which specifies (directly) this time-to-contact. Given that the muscle group selected includes both flexors and extensors, co-activation on the basis of tau information is evidenced.