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Washoe was a chimpanzee who learned to use a form of sign language. She was trained by Beatrice and Allan Gardner and acquired over 150 signs. These signs were used to represent people, objects, and actions, functioning similarly to nouns, verbs, and requests in human language.1

While Washoe and other apes demonstrated an ability to combine signs, the extent to which this constitutes true language use is a subject of ongoing debate among researchers. Some argue that apes may be imitating or performing learned responses rather than truly understanding linguistic meaning or syntax.1

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