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A series of studies by Piaget and Szeminska in 1941 and Piaget and Inhelder in 1967 revealed a horizontal décalage of approximately three years on tasks of length and weight seriation. The scientists tested 37 five- to ten-year-old boys and girls.
Piaget and Inhelder developed the test as part of their work on child development. It was first described in their book The Child's Conception of Space , published in French in 1948, with an English translation appearing in 1956.
Bärbel Inhelder grew up as an only child in Switzerland. Her Swedish-born father was a zoologist and her German-born mother was a writer. [1] At a young age Inhelder was moved around in different private and public schools; her father spent time teaching her history, philosophy, nature, and geography.
For Jean Piaget, the child is "a little scientist exploring and reflecting on these explorations to increase competence" and this is done in "a very independent way". [114]: 7, 9 Play is a major activity for ages 3–5. For Piaget, through play "a child reaches higher levels of cognitive development." [114]: 14
In Piaget's model of intellectual development, the fourth and final stage is the formal operational stage.In the classic book "The Growth of Logical Thinking from Childhood to Adolescence" by Jean Piaget and Bärbel Inhelder formal operational reasoning takes many forms, including propositional reasoning, deductive logic, separation and control of variables, combinatorial reasoning, and ...
Piaget proposed that children's inability to conserve is due to weakness in the way children think during the preoperational stage (ages 2–6). This stage of cognitive development is characterized by children focusing on a single, salient dimension of height or length, while ignoring other important attributes of an object. [ 2 ]
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Piaget came up with a theory for developmental psychology based on cognitive development. Cognitive development, according to his theory, took place in four stages. [ 1 ] These four stages were classified as the sensorimotor, preoperational, concrete operational and formal operational stages.