According to Jean Piaget,language and other symbols were first used in the preoperational stage.

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Jean Piaget's theory of cognitive development suggests that language and other symbols are first used during the preoperational stage, which typically occurs between ages two and seven. During this stage, children develop the ability to use symbols to represent objects, but their thinking is still largely egocentric and they struggle with logical operations.

According to Jean Piaget,language and Other Symbols Were First Used