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Thought and language are initially separate systems from the beginning of life, merging at around three years of age, producing verbal thought (inner speech). Language can be broken down into three stages:
1. external communication, used to talk to others
2. private speech, which is directed to the self and serves an intellectual function
3. and private speech(AKA inner thought)

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With the interaction of more knowledgeable individuals comes....

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The Zone of Personal Development describes the levels of things that people can and cannot do. Through interaction with an MKO, individuals are able to expand their limits and allow themselves to master more skills.

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More Knowledgeable Individuals pertains to people like parents and tutors, able to enhance the knowledge of those who have not experienced as much as them.

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Independence of though sprouts from the guidance of more knowledgeable individuals, allowing the child to develop their own skills. Children internalize through social interactions with the more knowledgeable members of society.

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Vygotsky claimed that infants were born with 4 basic abilities for intellectual development:
Attention
Sensation
Perception
Memory

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Cooperative or collaborative dialogue promotes cognitive development, and this is with the interaction with other children or adults. Vygotsky believed everything is learned on two levels. First, through interaction with others, and then integrated into the individual’s mental structure.

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Through interaction within their sociocultural environment, individuals are able to develop their higher mental processes.

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Through interaction of the child's sociocultural environment, these are developed into more sophisticated and effective mental processes called...