Ballargean's Infant Test in Which an Infant Watched a Moving

Multiple Choice

Ballargean's infant test in which an infant watched a moving screen either pass through or stop on an object suggested that:

A) infants achieve depth perception earlier than Piaget's developmental stages suggested.
B) infants look longer at hidden objects.
C) infants have a sense of object permanence earlier than Piaget suggested.
D) infants look longer at moving objects.