Wikipedia sayings about according to piaget, what is the first stage of cognitive development that humans experience?

1.Constructivism (philosophy of education)

and ethics. The origin of the theory is also linked to Swiss developmental psychologist Jean Piaget's theory of cognitive development. Constructivism

https://en.wikipedia.org/wiki/Constructivism (philosophy of education)

2.Educational psychology

of development, according to which children mature through four stages of cognitive capability. Piaget hypothesized that children are not capable of abstract

https://en.wikipedia.org/wiki/Educational psychology