In the preoperational stage, the preschool child begins to represent these permanent objects by internal processes or mental representations. Now the development of mental representations of useful objects proceeds at an astounding pace. In symbolic play, blocks may represent cars and trains. Capable of deferred imitation, the child may pretend to be a cowboy according to his or her memory image of a motion-picture cowboy. The most important of all representations are the hundreds of new words the child learns to speak.
As one might infer from the word "preoperational," this period, lasting from about age two through ages six or seven, is transitional. The preschool child still lacks the attention, memory capacity, and mental flexibility to employ his or her increasing supply of symbolic representations in logical reasoning (operations). It is as if the child remains so focused upon the individual frames of a motion picture that he or she fails to comprehend the underlying plot. Piaget calls this narrow focusing on a single object or salient dimension "centration." The child may say, for example, that a quart of milk he or she has just seen transferred into two pint containers is now "less milk" because the child focuses upon the smaller size of the new containers. Fido is seen as a dog, not as an animal or a mammal. The child uncritically assumes that other people, regardless of their situation, share his or her own tastes and perspectives. A two-year-old closes his eyes and says, "Now you don't see me, Daddy." Piaget calls this egocentrism.
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