Cette etude avait deux objectifs. L'un etait de mesurer, a differents niveaux d'ages, l'illusion de l'identite de l'objet pour des paires de formes differentes, presentees en mouvement apparent. L'autre consistait a determiner les effets de la demonstration de transformations sur l'identification des memes paires de formes lorsque presentees en mouvement apparent. Un total de 138 enfants (ages moyens: 5;6, 6;6 et 7;6 ans) a ete soumis a deux seances. La premiere presentait cinq couples de formes differentes en mouvement apparent afin de produire, pour chacun de ces couples, l'illusion d'un seul objet changeant de forme. La seconde seance presentait les memes couples en mouvement apparent, sauf que chacun de ces couples etait precede, individuellement, d'un demonstration de leur transformation. L'analyse nonparametrique des resultats montre que l'illusion de l'identite ne vane guere de maniere significative avec l'age, ou avec la demonstration des transformations. L'interpretation suggere que la representation des transformations serait un facteur plus important dans le processus d'identification que la simple perception de ces modifications. This study had two objectives. One was to measure, at different age levels, the illusion of the identity of an object for different pairs of shapes presented in apparent motion. The other was to determine the effects of continuous transformations on the identification of the same pairs of shapes when presented in apparent motion. A total of 138 children (mean ages: 5;6, 6;6, 7;6) was examined during two sessions. The first presented five pairs of different shapes in apparent motion in order to produce, for each pair, the illusion of identity of an object changing its shape. The second session presented the same pairs of stimuli in apparent motion, but each pair was preceded, individually, by a demonstration of their continuous modification. Non parametrical analyses showed that the illusion of identity of an object is not significantly affected by age or by the demonstration of the transformations. The interpretation suggests that the representation of transformations would constitute a more important factor in the process of identification than the simple perception of these modifications.
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