English Dictionary

[I]n some primates, especially chimpanzees, the hedonic mode of social communication predominates group interactions. […] This is marked by much physical contact, stroking, hugging, lip smacking and sharing. The social interactions are more relaxed, as are the individual members of the group, and there is much focus on physical contact. This is in marked contrast to other more primitive primates, where the agonic mode dominates social behaviour.