The measure might a psychologist use to demonstrate that an infant does not know that his teddy bear exists it is removed from his field of vision The object permanence task.
Piaget would expose a toy to a baby before hiding or taking it away in order to ascertain whether object permanence was present. In a particular iteration of his study, Piaget would conceal a toy under a blanket and then watch to see if the baby would look for it.
the sensory-motor stage (0–2 years old) initial phase of operation (2–7 years old) operational stage in concrete terms (7–11 years old) official operational phase (11 years old through adulthood).
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