The concept of conservation in Piaget's stages of cognitive development, especially focusing on decentration in concrete operational children.
Conservation is the key concept related to the scenario where a child believes there are more stars in the bottom row due to focusing on one dimension and lacking an understanding of quantity conservation.
In Piaget's stages of cognitive development, children in the concrete operational stage grasp conservation, realizing that changing the appearance of objects doesn't alter their quantity, unlike preoperational children.
Decentration is crucial for concrete operational children as they consider multiple dimensions instead of focusing solely on one, facilitating their understanding of conservation.
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