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sensorimotor (birth-2)
experiencing the world through senses and actions (looking, hearing, touching, etc.)
object permanence and stranger anxiety develop
preoperational (2— 6 or 7)
representing things with words and images; using intuitive rather than logical reasoning
pretend play and ego centrism develop
concrete operational (7—11)
thinking logically about concrete events; grasping concrete analogies and performing math
conservation and mathematical transformations develop
formal operational (12— adulthood)
abstract reasoning
abstract logic and potential for mature moral reasoning