During which stage of development do children first demonstrate a decline in egocentrism and a mastery of conservation

Question

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The concrete operational stage, which occurs around ages 7 to 12, is when children first demonstrate a decline in egocentrism and a mastery of conservation tasks (such as understanding that pouring the same amount of liquid from a wide container to a narrow container still results in the same amount of liquid). In contrast, during the preoperational stage (ages 2 to 7), children are still very egocentric and struggle with conservation tasks. The sensorimotor stage (ages 0 to 2) focuses on sensory exploration and building basic schemas, while the formal operational stage (ages 12 and up) involves more abstract reasoning and hypothetical thinking.

During Which Stage of Development Do Children First Demonstrate a Decline