Claxton Laura J, Keen Rachel, McCarty Michael E
University of Massachusetts at Amherst, USA.
Psychol Sci. 2003 Jul;14(4):354-6. doi: 10.1111/1467-9280.24421.
When adults reach for an object, kinematic measures of their approach movement are affected by what they intend to do after grasping it. We examined whether such future intended actions would be reflected in the approach-to-grasp phase of infant reaching. Twenty-one 10-month-old infants were encouraged to either throw a ball into a tub or fit it down a tube. Kinematic measures of the approach phase of the reach toward the ball were obtained using a motion analysis system. Infants, like adults, reached for the ball faster if they were going to subsequently throw it as opposed to using it in the precision action. The perceptual aspects of the ball were the same and cannot account for these kinematic differences. Infants appear to be planning both segments of their actions in advance. Our findings provide evidence for a level of sophistication in infant motor planning not reported before.
当成年人伸手去拿一个物体时，他们接近动作的运动学指标会受到抓住物体后打算做什么的影响。我们研究了这种未来的意向动作是否会在婴儿伸手抓取阶段的接近动作中得到体现。我们鼓励21名10个月大的婴儿要么把球扔进桶里，要么把球放进管子里。使用运动分析系统获取了伸手去拿球的接近阶段的运动学指标。与进行精细动作相比，如果婴儿随后要扔球，他们伸手去拿球的速度会更快，就像成年人一样。球的感知方面是相同的，无法解释这些运动学差异。婴儿似乎在提前规划他们动作的两个部分。我们的研究结果为婴儿运动规划中前所未有的复杂程度提供了证据。
