[Development of transformation ability of coordinate systems in spatial representation].

In this paper, we regard the coordination of spatial perspectives as the transformation-operations of coordinate system between the child's own viewpoint and the other's one. In order to clarify the developmental feature of transformation-patterns, the 6-10 years children were tested in Experiment I under three conditions: Perspective, plotting, and movement. In Experiment II, the consistency of transformation-patterns was examined. Main results were as follows: (1) Under the perspective condition, most of six years-children did not make any egocentric errors. (2) Some consistent transformation-patterns were identified in children's error's. (3) Both identification of the origin and right understanding of the transformation rules were recognized as essential bases for the coordination of perspectives.