Abstract
Bower (1974) has argued that visual tracking studies reveal that 5-month-old infants represent objects in space, something Pioget attributes to far older infants. Five- and 9-month old infants' notions about hidden objects were diag- nosed by two types of tricks. On stop trials, the object remained out of view longer than on nontrick trials. On transformation trials, one object disappeared but another appeared. Infants in both age groups were attentive to the object in= view and as it disappeared. However, 5-month-olds did not anticipate the reap- pearance of the object and did not clearly mark the screen as the location of the toy on stop trials. Nine-moth-olds often anticipated the object's reappearance but tended to be confused about where it would appear. They behaved compar- ably on stop trials. On transformation trials, 9-month-olds were somewhat more likely to be puzzled than 5-month-olds. The results provide more support for Piaget's view of the abilities of 5-month-olds than the view of Bower.
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