According to Michael Tomasello's theory of cultural learning and socio-cognitive development, at which stage of development and primarily through which psychological process does the capacity for 'shared intentionality' emerge in children?

Understanding Tomasello's Theory

According to Michael Tomasello, a unique feature of human cognitive development is 'shared intentionality', which typically emerges around 9 to 12 months of age.

• Joint Attention: Infants begin to share psychological space with others, focusing on the same object or event.
• Collaborative Activities: Children start sharing goals and intentions, which forms the foundation for cultural learning and language acquisition.
• Socio-Cultural Context: This perspective aligns closely with Lev Vygotsky's socio-cultural approach to cognitive development.

Therefore, option (a) accurately describes the developmental timeline and primary mechanism of shared intentionality.