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This document discusses Piaget's theory of cognitive development from infancy through adulthood. It describes the sensorimotor stage from birth to age 2 where infants learn through senses and motor skills. Next is the preoperational stage from ages 2 to 7, where language develops and imagination emerges. This is followed by the concrete operational stage from ages 7 to 11, where logical thought of concrete ideas occurs. Finally, the formal operational stage from ages 12 on involves thinking about abstract concepts and systematic problem solving.Read less