Today, L.S. Vygotsky's concept of a 'zone of proximal development' (ZPD) is often used to just mean best practices in early years teaching, like scaffolding. But in his original theory, the zones linked age periods distinguished by age-specific neoformations -- one of which was the formation of concepts at adolescence. So Vygotsky rejected Stern's…

A large battery of reading related skills were orally administered to 111 4-year old and 118 5-year old Korean kindergartners, who were also tested on reading of regular and irregular Korean Hangul words. In regression equations, speeded naming was uniquely associated with reading of both regular and irregular words. In contrast, only the three…