Newell K M, McDonald P V, Baillargeon R
Department of Kinesiology, University of Illinois, Urbana-Champaign, Illinois.
Dev Psychobiol. 1993 May;26(4):195-205. doi: 10.1002/dev.420260403.
This study examined whether hand/object size ratios define common boundaries to the grip configuration patterns of infants and adults. A group of 5- to 8-month-old infants and a group of adults engaged in a displacement grasping task with inverted cups that varied in size. The findings showed that infant and adult grip configurations varied systematically with object size: More digits were brought into the contact grip configurations with increasing object size. Furthermore, when object size was scaled to hand size, common dimensionless ratios defined the grasping patterns and transitions between grasping patterns in a similar manner for both adults and infants. Consistent with a dynamical view of the development of coordination, the strong role of body scale on the developmental prehensile coordination pattern was observed for a given set of task constraints.
本研究考察了手/物体大小比例是否为婴儿和成人抓握配置模式定义了共同边界。一组5至8个月大的婴儿和一组成人参与了一项使用大小各异的倒置杯子的移位抓握任务。研究结果表明，婴儿和成人的抓握配置随物体大小而系统变化：随着物体尺寸增加，更多手指参与到接触抓握配置中。此外，当将物体大小按手的大小进行缩放时，共同的无量纲比例以相似方式定义了成人和婴儿的抓握模式以及抓握模式之间的转变。与协调发展的动态观点一致，在给定的一组任务约束条件下，观察到身体比例对发育性抓握协调模式具有重要作用。
