Cortical activity in precision- versus power-grip tasks: An fMRI study
Cortical activity in precision- versus power-grip tasks: An fMRI study
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DOI：
10.1152/jn.2000.83.1.528
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发表时间：
2000-01-01
影响因子：
2.5
通讯作者：
Forssberg, H
中科院分区：
文献类型：
--
作者：
Ehrsson, HH;Fagergren, A;Forssberg, H
根据系统发育和功能的考虑，大多数手动握柄可以分为精确握柄和强力握柄。我们使用功能性磁共振成像来比较当受试者使用精确握法和强力握法时，右手产生力量时的大脑活动。在精确抓握任务中，受试者在食指和拇指的指尖之间施加精细的抓握力。在动力抓握任务中，受试者使用手掌对掌抓握的所有手指挤压圆柱形物体。记录在初级感觉和运动皮层对侧的操作手的活动是更高的权力时，比当受试者施加的力与精确的抓地力。与此相反，在同侧腹侧前运动区，扣带运动区，并在几个位置在后顶叶和前额叶皮质的活动是更强的，而使精确的抓地力比在权力的抓地力。动力抓握主要与对侧左侧活动相关，而精确抓握任务涉及两个半球的广泛激活。因此，我们的研究结果表明，除了初级运动皮层，运动前区和顶叶区是重要的指尖力量控制在精确的抓地力。此外，同侧大脑半球似乎强烈参与右手精确抓握任务的控制。
Most manual grips can be divided in precision and power grips on the basis of phylogenetic and functional considerations. We used functional magnetic resonance imaging to compare human brain activity during force production by the right hand when subjects used a precision grip and a power grip. During the precision-grip task, subjects applied fine grip forces between the tips of the index finger and the thumb. During the power-grip task, subjects squeezed a cylindrical object using all digits in a palmar opposition grasp. The activity recorded in the primary sensory and motor cortex contralateral to the operating hand was higher when the power grip was applied than when subjects applied force with a precision grip. In contrast, the activity in the ipsilateral ventral pre motor area, the rostral cingulate motor area, and at several locations in the posterior parietal and prefrontal cortices was stronger while making the precision grip than during the power grip. The power grip was associated predominately with contralateral left-sided activity, whereas the precision-grip task involved extensive activations in both hemispheres. Thus our findings indicate that in addition to the primary motor cortex, premotor and parietal areas are important for control of fingertip forces during precision grip. Moreover, the ipsilateral hemisphere appears to be strongly engaged in the control of precision-grip tasks performed with the right hand.