Koko Responds to Spoken English... This video contains footage from 1982 and 1984, when Koko was 11 and 13 years old, respectively. Koko's responses to Penny's spoken prompts are highlighted. During Koko's sign language acquisition phase, Penny consistently combined speech with signing. This upbringing in a bilingual setting enabled Koko to naturally grasp spoken English alongside sign language. Koko's understanding of spoken English developed organically, resembling the language acquisition pro

Young Koko Visits Stanford (Part 1) KokoARC Video (1974) In this video, a young Koko visits Stanford's campus with Dr. Patterson in the early 1970s. Project Koko began with Patterson's Stanford Psychology PhD project, evolving into the longest running ape language experiment ever conducted. In this clip, Koko's inquisitive personality and eagerness to learn are already evident while she enjoys exploring the open spaces in Palo Alto. | Koko & The Gorilla Foundation