Hanna-Pladdy B, Mendoza J E, Apostolos G T, Heilman K M
Department of Neurology, University of Florida, Gainesville 32610, USA.
J Neurol Neurosurg Psychiatry. 2002 Nov;73(5):574-7. doi: 10.1136/jnnp.73.5.574.
To learn if the left compared with the right hemisphere of right handed subjects exerts bilateral compared with contralateral motor control when performing precise and coordinated finger movements.
The study investigated intertask differences of manual motor asymmetries such as speed, precision, and independent finger movements, in patients with unilateral lesions of the left (LHD) or right hemisphere (RHD) and normal controls (C).
Normal subjects showed the greatest right hand preference on a task that required rapid coordinated and precise independent finger movements (coin rotation). Both hemisphere damaged groups revealed contralateral motor deficits, but the magnitudes of asymmetries were found to be significantly different (RHD>C>LHD) with contralateral and ipsilateral deficits for LHD subjects. The greatest ipsilateral deficits for the LHD subjects were on those tasks that require precision (grooved pegboard and coin rotation).
The degree of hemispheric specialisation is, in part, dependent upon the nature of the motor task, with left hemisphere motor control necessary for tasks that require precision and coordinated independent finger movements.
了解右利手受试者在进行精确且协调的手指运动时，与右侧半球相比，左侧半球是否发挥双侧而非对侧的运动控制。
该研究调查了左侧半球损伤（LHD）或右侧半球损伤（RHD）患者及正常对照组（C）在手动运动不对称方面的任务间差异，如速度、精度和独立手指运动。
在一项需要快速协调且精确的独立手指运动（硬币旋转）的任务中，正常受试者表现出最强的右手偏好。两个半球损伤组均显示出对侧运动缺陷，但发现不对称程度存在显著差异（RHD>C>LHD），LHD受试者存在对侧和同侧缺陷。LHD受试者最大的同侧缺陷出现在那些需要精度的任务（有槽钉板和硬币旋转）中。
半球专业化程度部分取决于运动任务的性质，对于需要精确且协调的独立手指运动的任务，左侧半球运动控制是必要的。
