Leconte Pascale, Fagard Jacqueline
Laboratoire Cognition et Développement, CNRS, UMR-8605, 71 avenue Edouard Vaillant, 92774 Boulogne Billancourt Cedex, France.
Dev Psychobiol. 2004 Sep;45(2):51-8. doi: 10.1002/dev.20019.
The goal of the present study was to compare the use of the preferred versus the nonpreferred hand in children performing two tasks of different levels of complexity, in various positions in space. Right-handed and left-handed consistent children were compared to their inconsistent counterparts. The results showed that the general tendency to use one's preferred hand to grasp an object is more or less pronounced depending on the object's spatial location and the task's complexity. The children used their preferred hand more often even when the object was presented contralaterally, and did so to a greater extent during the more complex task. Inconsistent-handers were more likely to shift to using their nonpreferred hand when the object was presented to this hand's side. Finally, we found that the influence of handedness consistency on hand use for the spatial positions varied with the complexity of the task. These results favor a view of handedness as a dynamic process in which motor preferences interact with task demand, probably through task-related attention.
本研究的目的是比较儿童在空间中不同位置执行两个不同复杂程度任务时，使用优势手与非优势手的情况。将惯用右手和惯用左手的一致性儿童与其不一致的同伴进行比较。结果表明，使用优势手抓取物体的总体倾向，会因物体的空间位置和任务的复杂程度而或多或少地有所不同。即使物体出现在对侧，儿童也更频繁地使用优势手，并且在更复杂的任务中这种情况更为明显。当物体出现在非优势手一侧时，非一致性手使用者更有可能转而使用非优势手。最后，我们发现惯用手一致性对空间位置上手使用的影响会随任务的复杂程度而变化。这些结果支持了将惯用手视为一个动态过程的观点，在这个过程中，运动偏好可能通过与任务相关的注意力与任务需求相互作用。
