Anticipating Koko”s next sign

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Photographer: Ron Cohn

Source: 071206_1dsm_VJ7A4847.jpg

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You have to be very attentive to communicate in sign language, especially when you”re communicating with a gorilla. Here, Dr. Penny Patterson is quietly interpreting Koko”s signs and simultaneously looking her in the eye to pick up facial expressions that could modulate or qualify Koko”s intended meaning.