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Official Piaget Website – Luxury Watches & Jewelry Online; ! Piaget Dancer High Qualität Replika Uhren 4641! Piaget proposed four major stages of cognitive development, and called them (1) sensorimotor intelligence, (2) preoperational thinking, (3) concrete operational thinking, and (4) formal operational thinking. Each stage is correlated with an age period of childhood, but only approximately.; Jean Piaget, (born August 9, 1896, Neuchâtel, Switzerland—died September 16, 1980, Geneva), Swiss psychologist who was the first to make a systematic study of the acquisition of understanding in children. He is thought by many to have been the major figure in 20th-century developmental psychology. Piaget’s early interests were in zoology; as a youth he published an article on his …, Piaget's 4 Stages of Cognitive Development Explained; 2.1 Cognitive Development: The Theory of Jean Piaget …, Jean Piaget (1896-1980) was a renowned psychologist of the 20th century and a pioneer in developmental child psychology. Piaget did not accept the prevailing theory that knowledge was innate or a priori. Instead, he believed a child’s knowledge and understanding of the world developed over time, through the child’s interaction with the world, empirically.. Piaget.