As mentioned in an earlier post on Piaget’s 4 stages of Cognitive Developments, Piaget also outlined 6 stages within the sensorimotor stage, in which human infants become aware that objects continue to exist even when they are not visible, known as object permanence. This is often testing using an A-not-B task, in which an experimenter hides a toy under box A, but then moves the toy to under box B. Infants that lack a complete understanding of object permanence will continue to search under box A. According to Piaget, this is one of the most important developments in an infants’ motor development, as it helps us to understand the world through multisensory representations of objects. Infants typically develop an understanding of object permanence by the time they are 12 months hold. However, object permanence has also been shown in many animals including dogs, birds, monkeys, and apes.