How Task Demands Shape Conservation Answers

Piaget’s conservation task shows how children judge whether a key property stays the same after a change in appearance. Jean Piaget used this classic test to study cognitive development and the shift in thinking that happens across childhood.

In the task, children first see two identical objects ...

In the mid-twentieth century, psychologist Jean Piaget developed his conservation task, which provided researchers with a way to evaluate the logic and reasoning abilities of children, and ultimately proposed a trajectory for cognitive development.

Between the ages of 2 and 7, a period that Piaget called the pre-operational stage, children...