किसने यह प्रतिपादित किया कि संज्ञानात्मक विकास में सांस्कृतिक उपकरण महत्वपूर्ण भूमिका निभाते हैं?

According to Vygotsky, the most developmentally significant form of play is:

Ramesh, an 8-year-old child, mostly interacts with his younger, less mature siblings. According to Lev Vygotsky's socio-cultural theory, what is the most likely result of this interaction?