Four-year-old Nina is shown two balls of play dough of the same weight. One ball is then mashed into a flat shape. When Nina is asked if the two objects have the same weight, she replies that the flat-shaped dough is heavier. In the context of Jean Piaget's cognitive theory, this illustrates Nina's inability to grasp

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Nina's response illustrates her inability to grasp the concept of conservation, which is the understanding that certain properties of objects, such as their mass, volume, or number, remain the same despite changes in the forms or arrangements of the objects. This concept is typically developed during the concrete operational stage of Piaget's theory of cognitive development, which children enter around the age of 7 or 8.

Four-Year-Old Nina Is Shown Two Balls of Play Dough of the Same