The work of Jean Piaget shaped our understanding of cognitive development in children, and it also gave us several tasks that we can use to study other animals. One classic issue studied by Piaget is ...

Why do babies love peekaboo so much? It may be because when you hide your face, they think it has ceased to exist. That’s according to Swiss psychologist Jean Piaget’s theories about “object ...

Developmentalists have overlooked the fundamental problem of the real impermanence of things. The question of the development of the rational understanding of impermanence is as yet unposed, despite ...

Babies begin to develop an understanding of object permanence as young as four months old. If a yellow ball is shown to a child, placed behind a curtain and taken away before the curtain is pulled ...