Examines the ability of infants to track and anticipate the final orientation of an object. Subjects were infants ranging from an average of four months to eight months old. Three experiments, with the last one as control, were carried out. Concludes that infants show some rudimentary mental rotation from four months of age. (MOK)

Three experiments explored preschoolers' developing knowledge of stable (identity, gender, and race), changeable (mood, weight, and health), and changeable-but-irreversible (age and height) characteristics when knowledge of those characteristics was tested verbally rather than pictorially. Found that children make systematic rather than random…