In psychology, centration is the likelihood to focus on only one aspect at a time. In Piaget’s theory of cognitive development, it applies to children in the developmental stages of 2 to 7 years old. It’s the idea that kids can only focus on one aspect of a situation or object at a time, and are oblivious to the rest.
For example, a child is sitting in front of a huge mostly empty bag of Halloween candy. They cry and complain that there’s no more. But then, magic! You transfer the few remaining pieces into a tiny bag and the child is now full of glee. They have won more candy, in their mind.
Silly kids. No wonder its so easy to steal candy from them.