Ideomotor apraxia and cerebral dominance for motor control
Ideomotor apraxia and cerebral dominance for motor control
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DOI：
10.1016/0926-6410(95)00034-8
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发表时间：
1996-03-01
期刊：
影响因子：
--
通讯作者：
Spatt, J
中科院分区：
文献类型：
--
作者：
Goldenberg, G;Hermsdorfer, J;Spatt, J
想象力运用障碍是左半球受损的症状。意识运用不能的患者在用他们没有瘫痪的左手模仿动作时会犯错误。这被认为是左半球运动优势的证据。据推测，左半球是占主导地位的内部预编程的熟练运动的任何一只手。我们研究了模仿无意义手势的运动轨迹的运动学。组分析证实，犹豫，反馈控制的运动普遍存在于失用症患者，但单个病例的分析显示，运动学正常的运动，导致apractic错误的存在。加强对反馈控制的依赖似乎是一种补偿策略，而不是apractic错误的来源。在第二项研究中，我们探讨了另一种假设，即失用症患者缺乏对人体的一般概念，而这对于将模型上看到的目标位置转化为患者身体上的目标位置是必要的。在自己和一个人体模型上检查了动作的模仿。失用症患者在模仿自己时犯错误，在模仿人体模型时也会犯错误。总之，这两项研究都支持这样的观点，即模仿手势的错误来源是在概念层面上寻找。这让人对左半球在运动控制方面的主导地位产生了怀疑。
Ideomotor apraxia is a symptom of left hemisphere damage. Patients with ideomotor apraxia commit errors when imitating movements with their left, non-paralyzed hand. This has been taken as evidence for a motor dominance of the left hemisphere. It has been hypothesized that the left hemisphere is dominant for internal preprogramming of skilled movements of either hand. We investigated the kinematics of movement trajectories of imitation of meaningless gestures. Group analysis confirmed that hesitant, feedback-controlled movement prevail in patients with apraxia, but analysis of single cases revealed the existence of kinematically normal movements leading to apractic errors. Enhanced reliance on feedback-control appears to be a compensatory strategy rather than the source of apractic errors. In a second study we explored the alternative hypothesis that patients with apraxia lack a general concept of the human body which is necessary to mediate the translation of a target position seen on the model into a target position on the patient's body. Imitation of movements was examined on oneself and on a mannikin. Patients with apraxia who made errors when imitating on themselves committed errors also when imitating on the mannikin. Taken together, both studies support the view that the source of errors in the imitation of gestures is to be sought at a conceptual level. This casts doubts on the alleged dominance of the left hemisphere for motor control.