... change as accommodation. It is through this process that Piaget believes infants gain their knowledge of object permanence. Piaget (1954) claims that very young infants lack the mental ability to distinguish between their actions on an object and the existence of the object itself. According to Piaget, once an object is out of sight it fails to exist as far as the infant is concerned, as the saying goes 'out of sight is out of mind.' It's not until the infant develops the mental capacity to make the distinction between an object and oneself that they understand that an object may continue to exist even when it's no longer to be seen. For Piaget, the acquisition of object permanence is signified when the infant searches for, and retrieves an hidden object. Piaget claimed that infants do not demonstrate this ability until they have reached stage iv of his six stage sensori-motor period, ...

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