Chimerism is what happens when cells from one twin are present in the other. For example, white blood cells with Y chromosomes would be found in the female twin. Vigier et. al, 1989.
Piaget's theory of cognitive development. Piaget's theory of cognitive development is a comprehensive theory about the nature and development of human intelligence. It was first created by the Swiss developmental psychologist Jean Piaget (1896â1980).
Zone of Proximal Development and Scaffolding. The psychologist Vygotsky developed a theory of cognitive development that focused on the role of culture in the development of higher mental functions. Several concepts arose from that theory that are important to classroom learning.This lesson will focus on two concepts: zone of proximal development and scaffolding.sychologist, Lev Vygotsky, developed a theory of cognitive development which focused on the role of culture in the development of higher mental functions.