Francine Patterson

Francine "Penny" Patterson (born February 13, 1947) is an American animal psychologist. She is best known for teaching a modified form of American Sign Language, which she calls "Gorilla Sign Language", or GSL, to a gorilla named Koko beginning in 1972, although the scientific validity of Patterson's claims as to the extent of Koko's language mastery has been debated.
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