I think a criticism of the primate stuff is that most apes cannot use sign language and that the Koko data was massaged.
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wait wait no: Gorilla Mindset
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But a big objection here is that the people who reported the Koko data allegedly threw out a bunch of signs for a variety of reasons.
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No. As I understand it, the ape would make a bunch of signs and the researchers would decline to "count" some of them for whatever reason.
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This and the fact that basically no other ape has gotten as fluent as Koko is alleged to have been are adduced in support of the position that she was basically 2 Clever 2 Hans.
End of conversation
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