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).
Home. Our goal at the Cognitive Development Center is to understand thinking and how it changes with development. We work with infants, children, and adolescents to explore the development of executive function, memory, and language. These cognitive processes develop dramatically during childhood, and predict important life outcomes years and even decades later.