Morange-Majoux F, Peze A, Bloch H
Laboratoire Cognition et Communication, Unité de Psychobiologie du Développement, EPHE-CNRS, Paris, France.
Laterality. 2000 Oct;5(4):351-62. doi: 10.1080/713754386.
The organisation of reaching movements was studied longitudinally (every two weeks) in infants aged from 20 to 32 weeks, in order to detect possible differences between the two hands. An object was presented on a table, at a reachable distance, and four trials were retained. Analysis of left and right hand movements was performed, frame-by-frame, on video images obtained from two cameras. Three body points were considered: the elbow, the wrist, and the major finger for drawing the profile of the movement. Three parameters were considered: movement time (MT), straightness, and number of changes in direction. Data show that the right hand MT is always shorter than the left hand MT. Moreover, the right hand is also continuously more directly oriented towards the object and makes fewer corrective changes than the left hand. These data show that a different organisation of movement of the left and the right hand exists early in infancy.
为了检测两只手之间可能存在的差异，对20至32周龄的婴儿进行了纵向研究（每两周一次），研究伸手够物动作的组织情况。在桌子上可触及的距离处放置一个物体，并保留四次试验。对从两台摄像机获得的视频图像逐帧分析左右手的动作。考虑了三个身体部位：肘部、手腕和用于描绘动作轮廓的主要手指。考虑了三个参数：动作时间（MT）、直线度和方向变化次数。数据表明，右手的MT总是比左手的MT短。此外，右手也比左手更持续地直接指向物体，并且进行的纠正性改变更少。这些数据表明，婴儿早期左右手的动作组织存在差异。
