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Estelle Chartrel, Annie Vinter
The present experiment aims at studying the evolution with age of the role of visual information in the production of isolated cursive letters. Children aged 8, 9 and 10 year-old and adults were asked to write different cursive letters (a, o, l, m and p) under three experimental conditions: with a normal vision, under an opaque open box that prevented vision from the hand and the trace, or without any visual information. The partial or complete withdrawal of visual information had a much greater effect on the children�s performances than on those of adults. Only an increase of pressure was observed in adults following the removal of visual information, while children compensated for the absence of visual feedback by increasing movement length, movement velocity, and pressure. By contrast, they maintained movement duration constant throughout the conditions. However, a non monotone development with age of some of these kinematic parameters was revealed. Moreover, the effect of visual information withdrawal on movement parameters differed as a function of the type of letter produced. Globally, these results showed that children relied much more than adults on visual feedback when they wrote, even for the simple production of isolated letters.
Notre recherche a pour objectif l�étude du développement du rôle des informations visuelles sur la production de lettres cursives. Des enfants de 8, 9, 10 ans et des adultes ont pour tâche d�écrire différentes lettres cursives (a, o, l, m et p) dans 3 conditions : normale (informations visuelles disponibles), la main placée sous un cache, avec les yeux fermés. L�absence de feedback visuel entraîne une modification des caractéristiques des mouvements plus importante chez les enfants que chez les adultes. Seule une augmentation de la pression est observée chez les adultes, alors que les productions des enfants subissent une augmentation de la vitesse, de la longueur des trajectoires formant les lettres, de la fluidité et de la pression. Un développement non monotone avec l�âge de certains indices est toutefois révélé.
