Prehension with the ipsilesional hand after unilateral brain damage
Prehension with the ipsilesional hand after unilateral brain damage
复制标题
DOI：
10.1016/s0010-9452(08)70791-3
复制
发表时间：
1999-04-01
期刊：
影响因子：
3.6
通讯作者：
Mai, N
中科院分区：
文献类型：
--
作者：
Hermsdörfer, J;Ulrich, S;Mai, N
在不同的运动任务中，已经报道了与脑损伤同侧的手部感觉运动缺陷。我们通过运动学分析评估了12例左脑（LBD）或右脑损伤（RBD）患者的同侧手的表现，以准确描述两个组成部分（运输和抓握）中可能存在的缺陷。两组患者在主要运动学参数方面均表现出性能缺陷，例如，降低了输送部件的速度并延长了运动时间。然而，虽然LED患者表现出更普遍的放缓，但RED患者特别延长了朝向物体运动的最后阶段。我们认为，相关的视觉空间表征和运动过程的适当映射可能会受损后RED。相比之下，LED引起了一个更不具体的干扰模式，支持运动程序的精确参数化受损的观点。两组患者的最大夹持孔径均正常。然而，由于孔径可能会受到缓慢运动的影响，因此抓握组件被保留的概念仍然是推测性的。两组患者均保留了调整输送部件最大速度以适应运动幅度变化以及调整抓取部件最大手孔以适应物体尺寸的能力。因此，两个半球都可以胜任这种缩放机制。
Sensorimotor deficits in the hand ipsilateral to a brain lesion have been reported in different motor tasks. We evaluated performance of the ipsilesional hand in 12 patients with either left (LBD) or right brain damage (RBD) by kinematic analysis in order to precisely characterize possible deficits in the two components of prehension (transport and grasp). Both patient groups exhibited performance deficits in the main kinematic parameters, e.g., reduced velocity of the transport component and prolonged movement time. However, while LED patients showed a more general slowing, RED patients prolonged in particular the last phase of the movement toward the object. We suggest that relevant visuospatial representations and the adequate mapping of motor processes may be impaired after RED. In contrast, LED caused a more unspecific disturbance pattern, supporting the view that the precise parameterization of motor programs is impaired. Maximum grip aperture was normal in both patient groups. However, since aperture could be biased by slowed movement, the notion that the grasp component was preserved remains speculative. The patient's ability to scale the maximum velocity of the transport component to adapt to changes in movement amplitude and to scale the maximum hand aperture of the grasp component to adapt to object size was preserved in both groups. Thus both hemispheres can have competence for this scaling mechanism.