Which psychologist identified the sensorimotor stage, preoperational stage, concrete operational stage and formal operational stage as a theory of cognitive development?
Jean Piaget’s theory of cognitive development stated that children moved through four stages of cognitive development; the sensorimotor stage (Birth to 2yrs), the infant experiences the world through movement and the utilization of their senses. The preoperational stage (2 to 7 yrs.), language is developing and the child is able to use words and pictures that represent objects. Children in this stage are also egocentric and can only see things from their point of view. The concrete operational stage (7 to 11yrs), children’s thinking is more logical and organized. Children begin to grasp the "concept of conservation," which Piaget states that children will begin to understand that the quantit
