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首页> 外文期刊>Acta neurobiologiae experimentalis >Switching handedness: fMRI study of hand motor control in right-handers, left-handers and converted left-handers
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Switching handedness: fMRI study of hand motor control in right-handers, left-handers and converted left-handers

机译：切换惯性：右手，左手和左手转换后的手部运动控制的fMRI研究

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The purpose of this study was to investigate the differences in the brain organization of motor control in left- and righthanders and to study whether early left-to-right handwriting switch changes the cortical representation of finger movements in the left and right hemispheres. Echo-planar MR imaging was performed in 52 subjects: consistent right-handers (RH), consistent left-handers (LH), and subjects who had been forced at an early age to switch their left-hand preferences toward the right side. The scanning was performed during simple (flexion/extension of the index finger) and complex (successive finger-thumb opposition) tasks. Subjects performed the tasks using both the preferred and non-preferred hand. In righthanders, there was a general predominance of left-hemisphere activation relative to right hemisphere activation. In left-handers this pattern was reversed. The switched subjects showed no such volumetric asymmetry. Increasing levels of complexity of motor activity resulted in an increase in the volume of consistently activated areas and the involvement of the ipsilateral in addition to contralateral activations. In both right-and left-handers, movements of the preferred hand activated mainly the contralateral hemisphere, whereas movements of the non-preferred hand resulted in a more balanced pattern of activation in the two hemispheres, indicating greater involvement of the ipsilateral activations. Overall, this study shows that in both left-and right-handed subjects, the preferred hand is controlled mainly by the hemisphere contralateral to that hand, whereas the non-preferred hand is controlled by both hemispheres. The switched individuals share features of both left-handers and right-handers regarding their motor control architectures.
机译：这项研究的目的是调查左手和右手在运动控制的大脑组织方面的差异，并研究早期的左右手写开关是否会改变手指在左右半球运动的皮层表现。在52位受试者中执行了回波平面MR成像：一致的惯用右手（RH），一致的惯用左手（LH），以及在很小的时候就被迫将他们的惯用左手偏向右侧的受试者。扫描是在简单的（食指弯曲/伸展）和复杂的（手指-拇指成功对接）任务中进行的。受试者用首选和非首选手执行任务。在右撇子中，左半球激活相对于右半球激活普遍占优势。在左撇子中，这种模式被颠倒了。转换后的受试者没有显示出这种体积不对称性。运动活动复杂性水平的提高导致持续激活区域的体积增加，除对侧激活外，同侧也参与其中。在左撇子和右撇子中，首选手的移动主要激活对侧半球，而非首选手的移动则导致两个半球的激活方式更加均衡，这表明同侧激活的参与程度更大。总体而言，这项研究表明，在左撇子和右撇子中，首选手主要由与该手相反的半球控制，而非首选手则由两个半球控制。交换的个人在其电机控制体系结构上共享左撇子和右撇子的功能。

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