Babik Iryna, Campbell Julie M, Michel George F
University of North Carolina at Greensboro.
Child Dev. 2014 Jan-Feb;85(1):294-307. doi: 10.1111/cdev.12121. Epub 2013 May 2.
Within-individual variability is such an apparent characteristic of infant handedness that handedness is believed to consolidate only in childhood. Research showed that manifest handedness is influenced by emerging postural skills (sitting, crawling, and walking). In this investigation, it was proposed that symmetric hand-use (tendency to acquire objects bimanually), rather than lateralized hand-use (the use of one hand more than the other), may be influenced by postural changes. Trajectories of lateralized and symmetric hand-use for object acquisition were examined in 275 infants tested monthly from 6 to 14 months. Multilevel modeling revealed that change in lateralized hand-use is unrelated to developmental transitions in infant posture, whereas the trajectory of symmetric hand-use changes significantly with the development of postural skills.
个体内部的变异性是婴儿利手如此明显的一个特征，以至于人们认为利手直到童年期才会巩固。研究表明，明显的利手受新兴姿势技能（坐、爬和走）的影响。在这项调查中，有人提出，对称用手（双手获取物体的倾向）而非偏侧用手（一只手比另一只手使用更多）可能受姿势变化的影响。对275名6至14个月每月接受测试的婴儿获取物体时偏侧用手和对称用手的轨迹进行了研究。多层次建模显示，偏侧用手的变化与婴儿姿势的发育转变无关，而对称用手的轨迹随姿势技能的发展而显著变化。
