I was as intrigued by what Gary Marcus didn't say in his Research Vision article1 as by what he did say. Specifically, how might his arguments be modified if non-human primate communication is largely nonverbal?
Roger Fouts of the Chimpanzee and Human Communication Institute, Central Washington University, told me of an instance in which video data capture revealed two adolescent chimpanzees signaling and accepting an invitation to play with a half-second rise of both eyebrows (private communication, 2001). In
William...