Ferguson G D, Duysens J, Smits-Engelsman B C M
University of Cape Town, Faculty of Health Sciences, Department of Health and Rehabilitation Sciences, Suite F45: Old Main Building, Groote Schuur Hospital, Main Road, Observatory 7925, Cape Town, 8000, South Africa; Katholieke Universiteit Leuven, Faculty of Kinesiology and Rehabilitation Sciences, Department of Kinesiology, Movement Control and Neuroplasticity Research Group, Tervuursevest 101, Postbox 1501, B-3001 Heverlee, Belgium.
Katholieke Universiteit Leuven, Faculty of Kinesiology and Rehabilitation Sciences, Department of Kinesiology, Movement Control and Neuroplasticity Research Group, Tervuursevest 101, Postbox 1501, B-3001 Heverlee, Belgium.
Neuroscience. 2015 Feb 12;286:13-26. doi: 10.1016/j.neuroscience.2014.11.032. Epub 2014 Nov 29.
The aim of this study was to examine how feedback, or its absence, affects children with Developmental Coordination Disorder (DCD) during a visuo-manual tracking task. This cross-sectional study included 40 children with DCD and 40 typically developing (TD) children between 6 and 10 years old. Participants were required to track a target moving along a circular path presented on a monitor by moving an electronic pen on a digitizing tablet. The task was performed under two visibility conditions (target visible throughout the trajectory and target intermittently occluded) and at two different target velocities (30° and 60° per second). Variables reflecting tracking success and tracking behavior within the target were compared between groups. Results showed that children with DCD were less proficient in tracking a moving target than TD children. Their performance deteriorated even more when the target was occluded and when the target speed increased. The mean tracking speed of the DCD group exceeded the speed at which the target rotated which was attributed to accelerations and decelerations made during tracking. This suggests that children with DCD have significant difficulties in visuo-manual tracking especially when visual feedback is reduced. It appears that their impaired ability to predict together with impairments in fine-tuning arm movements may be responsible for poor performance in the intermittently occluded visuo-manual tracking task.
本研究的目的是考察反馈或缺乏反馈如何在视觉手动跟踪任务中影响患有发育性协调障碍（DCD）的儿童。这项横断面研究纳入了40名6至10岁的患有DCD的儿童和40名发育正常（TD）的儿童。参与者需要通过在数位板上移动电子笔来跟踪监视器上沿圆形路径移动的目标。该任务在两种可见性条件下（目标在整个轨迹中可见和目标间歇性遮挡）以及两种不同目标速度（每秒30°和60°）下进行。比较了两组之间反映跟踪成功和目标内跟踪行为的变量。结果表明，患有DCD的儿童在跟踪移动目标方面不如TD儿童熟练。当目标被遮挡以及目标速度增加时，他们的表现恶化得更厉害。DCD组的平均跟踪速度超过了目标旋转的速度，这归因于跟踪过程中的加速和减速。这表明患有DCD的儿童在视觉手动跟踪方面存在显著困难，尤其是在视觉反馈减少时。似乎他们受损的预测能力以及精细调整手臂动作的受损可能是导致间歇性遮挡视觉手动跟踪任务中表现不佳的原因。
