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Assimilation operates jointly with accommodation , which is the revision or modification of pre-existing concepts in terms of new information or experience. The preschooler who initially generalizes the concept of bird to include any flying object, for example, eventually revises the concept to include only particular kinds of flying objects, such as robins and sparrows, and not others, like mosquitoes or airplanes. For Piaget, assimilation and accommodation work together to enrich a child’s thinking and to create what Piaget called cognitive equilibrium , which is a balance between reliance on prior information and openness to new information. At any given time, cognitive equilibrium consists of an ever-growing repertoire of mental representations for objects and experiences. Piaget called each mental representation a schema (all of them together—the plural—was called schemata ). A schema was not merely a concept, but an elaborated mixture of vocabulary, actions, and experience related to the concept. A child’s schema for bird , for example, includes not only the relevant verbal knowledge (like knowing how to define the word “bird”), but also the child’s experiences with birds, pictures of birds, and conversations about birds. As assimilation and accommodation about birds and other flying objects operate together over time, the child does not just revise and add to his vocabulary (such as acquiring a new word, “butterfly”), but also adds and remembers relevant new experiences and actions. From these collective revisions and additions the child gradually constructs whole new schemata about birds, butterflies, and other flying objects. In more everyday (but also less precise) terms, Piaget might then say that “the child has learned more about birds”.

The upper part of [link] diagrams the relationships among the Piagetian version of psychological constructivist learning. Note that the model of learning in the Exhibit is rather “individualistic”, in the sense that it does not say much about how other people involved with the learner might assist in assimilating or accommodating information. Parents and teachers, it would seem, are left lingering on the sidelines, with few significant responsibilities for helping learners to construct knowledge. But the Piagetian picture does nonetheless imply a role for helpful others: someone, after all, has to tell or model the vocabulary needed to talk about and compare birds from airplanes and butterflies! Piaget did recognize the importance of helpful others in his writings and theorizing, calling the process of support or assistance social transmission . But he did not emphasize this aspect of constructivism. Piaget was more interested in what children and youth could figure out on their own, so to speak, than in how teachers or parents might be able to help the young to figure out (Salkind, 2004). Partly for this reason, his theory is often considered less about learning and more about development , which is long-term change in a person resulting from multiple experiences. For the same reason, educators have often found Piaget’s ideas especially helpful for thinking about students’ readiness to learn, another one of the lasting educational issues that I discussed at the beginning of this chapter. I will therefore return to Piaget later to discuss development and its importance for teaching in more detail.

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Source:  OpenStax, Educational psychology. OpenStax CNX. May 11, 2011 Download for free at http://cnx.org/content/col11302/1.2
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