||Study of the invariance of a spatial relationship with 4 to 9 month-old infants: To be between 2 objects / Etude de l'invariance d'une relation spatiale chez les bebes de 4 a 9 mois: etre entre deux objets.
Investigated infants' understanding of a spatial relationship--an object between 2 other objects, and their detection of the invariance of this relationship over displacements of objects. 57 infants, aged 4 to 9 mo, were shown objects undergoing 3 types of movement: 2 rotations in the horizontal plane (180 and 90 degrees ), and 1 rotation in the vertical plane. In the first experiment these displacements were visible, and in the 2nd experiment they were invisible. Only the central object was moveable, and the Ss were expected to look at and grasp that object after the display moved. Results show that Ss tended to look at the central object the most, even when they did not grasp it or a different object. The 90 degrees rotation was the most difficult task, and the 180 degrees task was the easiest task. Ss as young as 5 mo mastered the tasks. (English abstract) (17 ref) (PsycINFO Database Record (c) 2005 APA, all rights reserved)