Development of infant reaching behaviors: Kinematic changes in touching and hitting
Development of infant reaching behaviors: Kinematic changes in touching and hitting
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DOI：
10.1016/j.infbeh.2013.09.009
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发表时间：
2013-12-01
影响因子：
2.1
通讯作者：
Mancini, Marisa Cotta
中科院分区：
文献类型：
--
作者：
Goncalves, Rejane Vale;Figueiredo, Elyonara Mello;Mancini, Marisa Cotta
这项纵向研究调查了4 ~ 8个月大的典型婴儿伸手的发展，并描述了婴儿在伸手抓目标时动作特征变化的手运动学模式。13名婴儿每两周随访一次。在幼儿与目标物的自由互动过程中，出现了两种接触行为：触摸和击打。记录了运动单位数、平直指数、距离、峰值速度和触摸和击打时达到峰值速度的时间随时间的变化。我们观察到随着时间的推移，触摸和点击的数量增加，手部运动学发生变化;与触摸相比，手部移动的距离更大。这些运动学变化是特定于婴儿达到目标所采用的运动模式。(C)2013 Elsevier Inc. All rights reserved.
This longitudinal study investigated the development of reaching in typical infants, from age 4 to 8 months, and described the pattern of hand kinematics underlying changes in the characteristics of infants' actions while reaching for a target. Thirteen infants were followed biweekly. Two reaching behaviors emerged during the infants' free interactions with the target, touching and hitting. Changes over time were documented for the number of movement units, straightness index, distance, peak velocity and time to peak velocity of the hand for touches and hits. We observed increases in the numbers of touches and hits and changes in hand kinematics over time; the distance traveled by the hand was greater for hitting compared to touching. These kinematic changes were specific to the movement patterns that infants adopted to reach to the target. (C) 2013 Elsevier Inc. All rights reserved.