Mammy the baby just lately learned about the outer world. She now spends hours batting the mobile over her crib. Mammie is presumably between 4 and 5 months old, and according to Piaget, this behavior is a secondary cyclical reaction.
The baby starts interacting with things around them. The newborn initially makes incidental touch with objects (like a crib mobile) before making deliberate contact with the objects and making it a habit.
A child's awareness of an object's continued existence even after they can no longer see or hear it is referred to as object permanence. You probably have an understanding of how this works if you've ever played "peek-a-boo" with a very young child.
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