The voluntary control of motor imagery. Imagined movements in individuals with feigned motor impairment and conversion disorder
The voluntary control of motor imagery. Imagined movements in individuals with feigned motor impairment and conversion disorder
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DOI：
10.1016/s0028-3932(00)00031-2
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发表时间：
2000-01-01
期刊：
影响因子：
2.6
通讯作者：
Velakoulis, D
中科院分区：
文献类型：
--
作者：
Maruff, P;Velakoulis, D
通过比较一名转换障碍患者（AB）和一名患者（MM）的真实的和想象的运动计时，研究了意志控制运动想象的能力。对照实验调查了一组健康个体的运动想象的自愿控制，这些健康个体用一只肢体假装运动障碍，他们被要求小心缓慢地移动。视觉引导的指向任务被用来调查的速度准确性权衡发生的目标大小是不同的真实的和想象的性能。在健康个体中，如果强调运动的速度和准确性，则真实的和想象的运动任务的速度与准确性的权衡符合Fitts定律。在多发性骨髓瘤中，尽管有相当大的疼痛和不适，但真实的和想象的表现也在正常范围内。在AB和假装运动障碍的受试者中，受影响肢体的运动任务表现缓慢，不符合费茨定律。然而，尽管受影响的肢体的想象表现通常比未受影响的肢体慢，但它确实符合菲茨定律。这些结果表明，受试者不能预期实际肢体损伤的影响。此外，虽然他们能够控制想象运动的一般持续时间，但他们对相对时间的控制很少。(C)2000爱思唯尔科技有限公司版权所有。
The ability to volitionally control motor imagery was investigated by comparing the chronometry of real and imagined movements in a patient (AB) with conversion disorder who presented with paralysis of the left arm and band and in a patient (MM) with an actual injury to the left arm. Control experiments investigated voluntary control of motor imagery in a group of healthy individuals who feigned a motor impairment with one limb and in one group who were instructed to move carefully and slowly. The visually guided pointing task was used to investigate the speed for accuracy trade-offs that occur as target size is varied for both real and imagined performance. In the healthy individuals, the speed for accuracy trade-off for both real and imagined performance on the motor task conformed to Fitts' law provided both the speed and accuracy of movements was emphasised. In MM, real and imagined performance was also within normal limits despite considerable pain and discomfort. In AB and in subjects feigning a motor impairment, motor task performance with the affected limb was slow and did not conform to Fitts' law. However, although imagined performance with the affected limb was generally slower than with the unaffected limb, it did conform to Fitts' law. These results suggest subjects cannot anticipate the effects of an actual limb injury. Furthermore, while they are able to control the general duration of imagined movements they have little voluntary control over their relative timing. (C) 2000 Elsevier Science Ltd. All rights reserved.