Sign language acquisition in primates has been criticized on the basis that:

Question

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Studies have shown that while some primates have been able to learn a large number of signs in American Sign Language (ASL), their use of signs was often just imitative and lacked any true understanding. Additionally, their signs were often random combinations rather than part of a two-way conversation, leading to criticism that they were not truly acquiring language.

Sign Language Acquisition in Primates Has Been Criticized on the Basis