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.