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Jean Piaget
Jean Piaget was an early developmental psychologist whose research provided enormous insight into the cognitive differences between young children and adults. For example, he demonstrated that very young children do not possess object permanence. He is also known for developing specific experimental methods to test his theories, such as the Three-Mountain Task designed to assess egocentrism.
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Jean Piaget
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A researcher observes that infants respond differently to a caregiver's temporary absence in an unfamiliar setting. Some explore freely when the caregiver is present, some are anxious and clingy throughout, and others appear indifferent to the caregiver's presence or departure. What is the most significant conclusion that can be drawn from these varied observations?