Wilmut Kate, Wann John
Department of Psychology, Oxford Brookes University, Headington Campus, Oxford, UK.
Exp Brain Res. 2008 Dec;191(4):403-18. doi: 10.1007/s00221-008-1532-4. Epub 2008 Aug 16.
The need for a movement response may often be preceded by some advance information regarding direction or extent. We examined the ability of individuals with Developmental Coordination Disorder (DCD) to organise a movement in response to advance information. Pre-cues were presented and varied in the extent to which they indicated the response target. Both eye movement latencies and hand movements were measured. In the absence of pre-cues, individuals with DCD were as fast in initial hand movements as the typically developing (TD) participants, but were less efficient at correcting initial directional errors. A major difference was seen in the degree to which each group could use advance pre-cue information. TD participants were able to use pre-cue information to refine their actions. For the individuals with DCD this was only effective if there was no ambiguity in the advance cue and they had particular difficulty in using predictive motion cues. There were no differences in the speed of gaze responses which excluded an explanation relating to the dynamic allocation of attention. Individuals with DCD continued to rely on the slower strategy of fixating the target prior to initiating a hand movement, rather than using advance information to set initial movement parameters.
运动反应的需求往往可能在有关方向或范围的一些预先信息之前出现。我们研究了患有发育性协调障碍（DCD）的个体根据预先信息组织运动的能力。呈现了预线索，其在指示反应目标的程度上有所不同。同时测量了眼动潜伏期和手部动作。在没有预线索的情况下，患有DCD的个体初始手部动作的速度与发育正常（TD）的参与者一样快，但在纠正初始方向错误方面效率较低。两组利用预先预线索信息的程度存在重大差异。TD参与者能够利用预线索信息来优化他们的动作。对于患有DCD的个体来说，只有在预先线索没有歧义的情况下这才有效，并且他们在使用预测性运动线索方面特别困难。注视反应的速度没有差异，这排除了与注意力动态分配相关的解释。患有DCD的个体在开始手部动作之前继续依赖较慢的策略，即注视目标，而不是利用预先信息来设置初始运动参数。
