No stable arm preference during the pre-reaching period: A comparison of right and left hand kinematics with and without a toy present
No stable arm preference during the pre-reaching period: A comparison of right and left hand kinematics with and without a toy present
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DOI：
10.1002/dev.20297
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发表时间：
2008-05-01
影响因子：
2.2
通讯作者：
Galloway, J. C.
中科院分区：
文献类型：
--
作者：
Lynch, A.;Lee, H. M.;Galloway, J. C.
成年人的手偏好出现在复杂的发展变化，在手臂和手的使用在儿童时期。最近的报告强调了在生命的第一年，包括到达发病前的一段时间，了解手臂和手的使用的重要性。这项纵向研究验证了这一假设，即显着的右，左差异存在前达到手臂运动。我们研究了13名健康婴儿从8周龄到开始伸手的一周内在有和没有玩具的情况下的右手和左手运动学。发现了显著的左右差异，但是在一种条件或不同条件下没有明确的模式。在没有玩具的情况下，右手移动得更快，但结束时离中线更远，并且与其他阶段相比，在晚期阶段显示出更多的运动。在玩具存在的情况下，右手移动的长度更长，但结束的动作离玩具更远。当左手和右手运动学相结合，以前的研究结果的右手运动学单独支持。虽然婴儿开始适应他们的前达到运动学的许多周前达到发作，我们没有发现一个系统的右，左的差异，在达到发作前的运动有或没有玩具存在的证据。我们的研究结果，加上其他报告，表明手的不对称开始出现在一年后达到发病的发展变化，无论是在婴儿，物理和社会环境。(C)2008 Wiley Periodicals，Inc.
Adult hand preference emerges from complex developmental changes in arm and hand use during childhood. Recent reports have highlighted the importance of understanding arm and hand use during the first year of life including the period before reach onset. This longitudinal study tested the hypothesis that significant right-left differences exist in pre-reaching arm movements. We examined right and left hand kinematics from 13 healthy infants during trials with and without a toy present from 8 weeks of age through the week of reach onset. Significant right-left differences were found, however there was no clear pattern within a condition or across conditions. Without a toy present, the right hand moved faster, yet ended further from midline, and displayed more movements during the Late phase compared to other phases. With a toy present, the right hand moved longer lengths, yet ended movements further away from the toy. When left and right hand kinematics were combined, previous findings of right hand kinematics alone were supported. Although infants begin adapting their pre-reaching kinematics many weeks before reach onset, we did not find evidence of a systematic right-left difference before reach onset in movements with or without a toy present. Our results, coupled with other reports, suggest hand asymmetries begin to emerge over the year following reach onset amid developmental changes both within the infant, and the physical and social environment. (C) 2008 Wiley Periodicals, Inc.