Jean Piaget was born in Neuchatel, Switzerland, where he studied at the university and received a doctorate in biology at the age of 22. Following college he became very interested in psychology and began to research and studies of the subject. With his research Piaget created a broad theoretical system for the development of cognitive abilities. His work, in this way, was much like that of Sigmund Freud, but Piaget emphasized the ways that children think and acquire knowledge.
Piaget referred to his theory as genetic epistemology. This is defined as the study of the acquisition, modification, and growth of abstract ideas and the abilities as on the basis of an inherited or biological substrate, an intelligent functioning that makes the growth of abstract thought possible.(Ginsburg 5) Piaget derived his theories from directly observing children and by questioning them about their thinking. He was less interested in whether the children answered correctly than how they arrived at their answers. Piaget viewed intelligence as an extension of biological adaptation that has a logical structure. One of the central points of his theories was that of epigenesis. This is that growth and development occur in a series of stages, each of which is built on the successful mastery of the previous stage.(Furth 33)
Piaget described four major stages leading to the capacity for adult thought. Each stage is a prerequisite for the following stage, but the rate at which different children move through different stages varies with their heredity and environment. Piaget 's four stages are the sensorimotor stage, the stage of preoperational thought, the stage of concrete operations and the stage of formal operations.
The first stage that Piaget felt all children go through was the sensorimotor stage. This