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首页> 外文期刊>The European Journal of Neuroscience >Differential cortical activity for precision and whole-hand visually guided grasping in humans.
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Differential cortical activity for precision and whole-hand visually guided grasping in humans.

机译：差异皮层活动可在人类中进行精确的和全手工的视觉引导抓握。

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摘要

Effective grasping involves the remarkable ability to implement multiple grasp configurations such as precision grip (PG; opposition between the index finger and thumb) and whole-hand grasp (WHG), depending on the properties of the object grasped (e.g. size, shape and weight). In the monkey brain, different groups of cells in the anterior-lateral bank of the intraparietal sulcus (area AIP) are differentially active for various hand configurations during grasping of differently shaped objects. Visually guided grasping studies in humans suggest the anterior intraparietal sulcus (aIPS) as the homologue of macaque area AIP, but leave unresolved the question of whether activity in human aIPS reflects the relationship between object size and grasp configuration, as in macaques. To address this issue, a human fMRI study was conducted in which objects were grasped with the right hand while object size was varied. The results indicated that the left aIPS was active when the subjects naturally adopted a PG to grasp the small object but showed a much weaker response when subjects naturally adopted a WHG to grasp the large object. The primary motor cortex and somatosensory cortices were active for both PG and WHG. Our results suggest that, in humans, the aIPS is centrally involved in determining the type of grasp.
机译：有效的抓握涉及卓越的能力，可根据被抓物体的特性（例如大小，形状和重量）实现多种抓握配置，例如精确抓握（PG;食指和拇指之间的对置）和全手抓握（WHG） ）。在猴脑中，在抓握形状不同的物体期间，顶内沟前外侧银行（区域AIP）中的不同组细胞对于各种手部构造具有不同的活动性。视觉指导的人类抓握研究表明，前顶壁沟（aIPS）是猕猴区AIP的同源物，但尚未解决人类aIPS的活动是否像猕猴一样反映物体大小与抓握构型之间关系的问题。为了解决这个问题，进行了一项人类功能磁共振成像研究，其中在物体大小变化的情况下，用右手抓住物体。结果表明，当受试者自然采用PG抓住小物体时，左aIPS处于活动状态，但是当受试者自然采用WHG抓住大物体时，左aIPS的反应弱得多。初级运动皮层和体感皮层对PG和WHG均有效。我们的结果表明，在人类中，aIPS参与确定抓地力的类型。

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