Laboratoire Psychologie de la Perception Institut Neurosciences Cognition Université Paris Descartes Centre National de Recherche Scientifique
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Changes in interhemispheric transfer and the development of bimanual coordination

In this study, we investigated the effect of the development of interhemispheric communication on age-related change in bimanual coordination. Interhemispheric communication was assessed by comparing the latency of a manual response to a visual stimulus when the hemisphere perceiving the stimulus and the hemisphere controlling the manual response were the same (uncrossed condition) to the latency when they were different (crossed condition). In the first experiment (5-10-yr-olds) we used a two-choice response-time task, and in the second experiment (3-7-yr-olds) we used a simple response-time task. In both studies, bimanual coordination was tested on a line-drawing task, and we compared performance on mirror and parallel movements. The crossed-uncrossed difference decreased with age in both experiments. When estimated on the simple response-time task, the crossed-uncrossed difference was related to the difference in performance between mirror and parallel movements on the bimanual task. Thus, improved interhemispheric communication contributes to progress in bimanual coordination, especially that which requires resisting the attraction of mirror movements in order to rotate both hands with parallel movements. (PsycINFO Database Record (c) 2000 APA, all rights reserved)