Chen Yu-ping, Yang Tsui-Fen
Department of Psychology, University of Massachusetts, Amherst, USA.
J Mot Behav. 2007 Jul;39(4):317-24. doi: 10.3200/JMBR.39.4.317-325.
The authors examined whether the intended task goal of the subsequent action affects the reaching patterns before the intended goal in 17 children with cerebral palsy (CP). The authors hypothesized that when the children with CP used their less affected hand, they would not be affected by the task goals and that their reaching pattern would deviate from those of 17 age-matched children without CP and 20 young healthy adult participants. All participants were instructed to reach and grasp a tennis ball and then to either fit or throw it. Kinematic variables (movement time, straightness ratio, peak velocity, percentage of time to peak velocity, and number of movement units) were used as outcome measures. Children with CP used slower, less straight, less forceful, and jerkier reaching patterns to approach the object than did children without CP and adults. Unlike in children and adults without CP, the intended goal of the subsequent action did not affect the reaching pattern before the intended goal in children with CP. Children with CP may therefore have difficulty in anticipatory planning and thus must segment the integrative action plan into sequential submovements.
作者研究了后续动作的预期任务目标是否会影响17名脑瘫（CP）儿童在预期目标达成之前的伸手模式。作者假设，当脑瘫儿童使用其受影响较小的手时，他们不会受到任务目标的影响，并且他们的伸手模式将与17名年龄匹配的无脑瘫儿童以及20名年轻健康成人参与者的伸手模式不同。所有参与者均被指示伸手去抓一个网球，然后要么将其放入合适位置要么将其抛出。运动学变量（运动时间、直线度比率、峰值速度、达到峰值速度的时间百分比以及运动单元数量）被用作结果指标。与无脑瘫儿童和成人相比，脑瘫儿童在接近物体时使用的伸手模式更慢、更不直、力度更小且更急促。与无脑瘫的儿童和成人不同，后续动作的预期目标并未影响脑瘫儿童在预期目标达成之前的伸手模式。因此，脑瘫儿童可能在预期规划方面存在困难，因此必须将综合行动计划分解为连续的子动作。
