April 11, 2013 by sarahmortonisp
French scientist Jean Piaget came up with a theory of cognitive development, which he broke down into 4 stages (Sensorimotor, Preoperational, Concrete Operational, and Formal Operations). Each stage has its characteristic things, some of which are not explained in the chart, so I will do so below:
1)Object permanence is the knowledge that when an object is out of sight, it doesn’t disappear.
2) Egocentrism is the phenomenon where children believe everything is about them. In an experiment, children were shown a short puppet display where “sally” lost her ball. The children were then shown where sally’s ball was, and when sally re-entered the room, the children expected sally to go and retrieve her ball because they didn’t understand that sally does not know everything they do.
3)Conservation is the ability to see that things remain constant, even if they change forms. For example, a child may see water in a short fat glass being poured into a tall skinny glass, yet then go on to say that there is more in the tall skinny glass.
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