Token transfers among great apes (Gorilla gorilla, Pongo pygmaeus, Pan paniscus, and Pan troglodytes): Species differences, gestural requests, and reciprocal exchange
Publication/Journal: Journal of Comparative Psychology
Keywords: bonobos, chimpanzees, gestural requests, gorilla gorilla, gorillas, great apes, orangutans, pan paniscus, pan troglodytes, pongo pygmaeus, primates, reciprocity, token transfers
2009
Chimpanzee (Pan troglodytes) anticipation of food return: Coping with waiting time in an exchange task
Publication/Journal: Journal of Comparative Psychology
Keywords: anticipation, chimpanzee, delayed gratification, exchange, reciprocal altruism
2007