title: [Systems of spatial reference and their interactions in preschool children. I. Degree of constraint in perceptive data].
mesh_terms: D002648:Child; D002657:Child Development; D002675:Child, Preschool; D004193:Discrimination Learning; D005260:Female; D006801:Humans; D008297:Male; D013028:Space Perception; D013647:Task Performance and Analysis; D014796:Visual Perception
vernacular_title: Les systèmes de référence spatiaux et leur interaction chez les enfants d'age préscolaire. I. Le degré de contrainte des données perceptives