Lev Vygotsky (1896-1934) was a Russian psychologist who developed a theory of cognitive development that emphasized how social interaction and culture impact learning. He believed that mental processes originate from social interactions and are then internalized. According to Vygotsky, children are born with mental abilities that develop through their use of tools for thought, including both technical tools and psychological tools like language, which he identified as the most important psychological tool as it develops from social speech to inner thought.
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