Anticipatory planning deficits and task context effects in hemiparetic cerebral palsy
Anticipatory planning deficits and task context effects in hemiparetic cerebral palsy
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DOI：
10.1007/s00221-005-0327-0
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发表时间：
2006-06-01
影响因子：
2
通讯作者：
Bekkering, Harold
中科院分区：
文献类型：
--
作者：
Mutsaarts, Marcel;Steenbergen, Bert;Bekkering, Harold
患有偏瘫性脑瘫（HCP）的个体表现出异常的运动输出，主要在身体的一侧。这里的问题是HCP参与者是否有能力预测动作序列目标的即将到来的知觉运动要求。这种预先规划对于成功地执行所研究的任务是必要的。在实验一中，HCP参与者必须用他们未受损的手抓住一个六角形的旋钮，从五种可能的抓握模式中选择一种（自由选择），然后顺时针或逆时针旋转60度、120度或180度。HCP参与者在整个任务过程中表现出大量的任务失败。这些发现表明人们缺乏预期计划。在对照组中没有观察到这样的任务失败。此外，指示旋转度对HCP参与者选择抓取模式的影响小于对照组。在实验二中，我们调查了HCP参与者是否倾向于使用任务中直接可用的上下文信息，而不是计划即将到来的感知运动需求。为了达到这个目的，在六边形的一侧插入一个箭头，这个箭头的位置与要计划和执行的行动无关。这个箭头的位置显著影响了HCP参与者选择的握把，但在对照组中没有。总的来说，结果表明HCP参与者的预期计划缺陷可能是由运动想象水平的损伤引起的。因此，作为一种替代策略，HCP参与者的表现主要基于任务环境中直接可用的信息。
Individuals with hemiparetic cerebral palsy (HCP) display deviant motor output, predominantly on one side of the body. The question pursued here is whether HCP participants have the ability to anticipate the forthcoming perceptual-motor demands of the goal of an action sequence. Such anticipatory planning was necessary to successfully perform the tasks that were studied. In experiment I, HCP participants had to grasp a hexagonal knob with their unimpaired hand by choosing one of five possible grasping patterns (free choice) and consequently rotate it 60 degrees, 120 degrees, or 180 degrees clockwise or counterclockwise. HCP participants showed a large amount of task failures that were persistent throughout the task. These findings suggest a deficit in anticipatory planning. No such task failures were observed for the control group. In addition, the instructed degree of rotation had less effect on the selected grasping pattern for the HCP participants than for the controls. In experiment II, we investigated if HCP participants are prone to use context information that is directly available in the task, instead of planning the forthcoming perceptual-motor demands. To that aim, an arrow was inserted at one of the sides of the hexagon in a position that had no relevance for the action to be planned and executed. The location of this arrow significantly affected the grip selected in the HCP participants, but not in controls. Overall, the results suggest an anticipatory planning deficit in HCP participants that may be caused by an impairment at the motor imagery level. Consequently, as an alternative strategy, performance in HCP participants was predominantly based on information directly available in the task context.