One hundred and sixty first grade boys and girls of normal intelligence were tested for ability to conserve multiple space relations. The criterion task apparatus was a wooden T with a model of schoolhouse attached and centered above the point of contact of the horizontal and vertical axis. The T had a track running the length of both its axes…

This paper examines the concept of decalage from two cognitive-change positions (structures of logical thought and attentional and verbal mediators) and proposes an alternative explanation for decalage from a perceptual-change point of view. The term decalage is used to summarize the relation between differences in performance of various age…