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Vygotsky: The Man and His Theory 2. Vygotsky's Genetic Method 3. The Social Origins of Higher Mental Functions 4. Vygotsky's Semiotic Analysis 5. Extending Vygotsky's Semiotic Analysis: Propositional and Discourse Referentiality 6. Semiotic Mechanisms in Vygotsky's Genetic Law of Cultural Development 7. Units of Psychological Functioning: Consciousness, Word Meaning, and Action 8.
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Kozulin et al. (1987) studied this question.
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