STRUCTURING OF EARLY REACHING MOVEMENTS - A LONGITUDINAL-STUDY
STRUCTURING OF EARLY REACHING MOVEMENTS - A LONGITUDINAL-STUDY
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DOI：
10.1080/00222895.1991.9942039
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发表时间：
1991-12-01
影响因子：
1.4
通讯作者：
VONHOFSTEN, C
中科院分区：
文献类型：
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作者：
VONHOFSTEN, C
对5名婴儿在19周龄时记录的REACH进行了定量研究，此后每隔3周记录一次，直到31周龄。早些时候关于行动单位的调查结果得到了证实。在所有被研究的年龄段，动作都被组织成加速和减速阶段。在这些单元中，到达的轨迹被发现是相对直线的，并且在它们之间改变方向。研究还发现，在所有年龄段，每个河段一般都有一个占主导地位的运输单位。在研究期间，到达动作的结构发生了四个重要的变化。首先，随着年龄的增长，序列结构变得更加系统化，占主导地位的运输单位开始运动。第二，运输单位的持续时间变得更长，涵盖了更大比例的做法。第三，动作单位数量随年龄增长而减少，接近成人触达的两阶段结构。最后，随着年龄的增长，到达的轨迹变得更加笔直。
Reaches, performed by 5 infants, recorded at 19 weeks of age and every third week thereafter until 31 weeks of age, were studied quantitatively. Earlier findings about action units were confirmed. At all ages studied, movements were structured into phases of acceleration and deceleration. Reaching trajectories were found to be relatively straight within these units and to change direction between them. It was also found that at all ages, there was generally one dominating transport unit in each reach. The structuring of reaching movements changed in four important ways during the period studied. First, the sequential structuring became more systematic with age, with the dominating transport unit beginning the movement. Second, the duration of the transport unit became longer and covered a larger proportion of the approach. Third, the number of action units decreased with age, approaching the two-phase structure of adult reaching. Finally, reaching trajectories became straighter with age.