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Vygotsky believed social interaction involves cooperative and collaborative dialogue which promotes this cognitive ability or development .

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Higher mental functions are independent learning and thinking .

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Language - Main means by which adults transmit info to children , very powerful tool of intellectual adaptation .

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Zone of Proximal Development - Most sensitive part of instruction or guidance should be given .

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MKO - more knowledgeable other , better understanding and higher learning ability than other .

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These four mental functions were : attention , perception , sensation , and memory .

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Vygotsky believed babies have four elementary mental functions .