Piaget
The egocentric talk which is not directed to anyone neither is adapted to the other comprehension is differentiated from the outer speech. Language illustrates the existing schemes but it does not have significant role on the cognitive development, neither helps the child to construct new structures.
Vigotsky
Talk moves from the social world to the private speech and afterwards, it is transformed into internal speech, accomplish the function of cognitive self-direction. The egocentric talk is the function of this kind of private talk is to help the child to regulate the behavior and solve problems
Vigotski think that children development depends on the learning. To him , mental or psychological functions are social and are classified as inferior and superior.The lower psychological functions are biological or genetically formed (involuntary), and higher mental functions are formed socially through educational processes and giving them tools or signs. But Piaget think that there are different stages that a children have to pass in order to acquire the knowledge.
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