Between the various types of rules which we shall give there will therefore be at once continuity of function and difference of structure. This renders arbitrary any attempt to cut mental reality up into stages. The matter is further complicated by the Law of conscious realization and the resulting time-lag. The appearance of a new type of rule on the practical plane does not necessarily mean that this rule will come into the subject's consciousness, for each mental operation has to be relearned on the different planes of action and of thought.
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About Jean Piaget
Jean Piaget was a 19th-century Swiss psychologist. Jean William Fritz Piaget (, ; French: [ʒɑ̃ pjaʒɛ]; was a Swiss psychologist known for his work on child development. Piaget's theory of cognitive development and epistemological view are together called genetic epistemology. Read more on Wikipedia →