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.
Anticipating Koko”s next sign
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Photographer: Ron Cohn
Source: 071206_1dsm_VJ7A4847.jpg