When does play panting occur during social play in wild chimpanzees?

To clarify the social functions of play panting in chimpanzees, I investigated when they emitted play panting in social play and how the interactions were affected by the occurrence of play panting. The subjects were the M-group chimpanzees living in Mahale, Tanzania. The following observations were made: (1) chimpanzees emitted play panting when they were tickled or chased but rarely did so when they tickled or chased others. Chimpanzee play panting does not have the function of a play signal communicating that these “aggressive” actions are performed not as aggression but as play. (2) Chimpanzees emitted play panting more often when they received “aggressive” actions that supposedly elicited higher arousal. (3) A chimpanzee tended to continue to perform “aggressive” actions when the target emitted play panting. Play panting activates the interaction of social play by encouraging the performer to continue tickling or chasing. These results can be summarized as showing that chimpanzee play panting serves as positive feedback to the play partner for continuing somewhat fragile interactions, which may contain the risk of excessive arousal and the risk of confusing “defensive” actions by the target of the “aggressive” actions with real efforts to escape the situation.

[1]  W. McGrew,et al.  Ethogram and Ethnography of Mahale Chimpanzees , 1999 .

[2]  Marc Bekoff,et al.  Play Signals as Punctuation: The Structure of Social Play in Canids , 1995 .

[3]  F. Waal,et al.  The Communicative Repertoire of Captive Bonobos (Pan Paniscus), Compared To That of Chimpanzees , 1988 .

[4]  P. Rodman.  The chimpanzees of the mahale mountains , 1991, International journal of primatology.

[5]  B. Jones.  An Ethological Study of Some Aspects of Social Behaviour of Children in Nursery School , 1967 .

[6]  J. Bachorowski,et al.  The acoustic features of human laughter. , 2001, The Journal of the Acoustical Society of America.

[7]  V. Hooff.  A comparative approach to the phylogeny of laughter and smiling. , 1972 .

[8]  T. Hasegawa,et al.  Demographic study of a large-sized unit-group of chimpanzees in the mahale mountains, Tanzania: A preliminary report , 1984, Primates.

[9]  T. Nishida,et al.  A quarter century of research in the mahale mountains an overview , 1990 .

[10]  G. Berntson,et al.  Conspecific screams and laughter: cardiac and behavioral reactions of infant chimpanzees. , 1989, Developmental psychobiology.

[11]  Hitoshige Hayaki,et al.  Social play of juvenile and adolescent chimpanzees in the Mahale Mountains National Park, Tanzania , 1985, Primates.

[12]  D. Symmes,et al.  Play vocalizations of squirrel monkeys (Saimiri sciureus). , 1986, Folia primatologica; international journal of primatology.

[13]  G. Weisfeld.  The adaptive value of humor and laughter , 1993 .

[14]  W. McGrew.  An ethological study of children's behavior , 1972 .

[15]  C. Darwin.  The Expression of the Emotions in Man and Animals , .

[16]  M. Rothbart,et al.  Laughter in young children. , 1973, Psychological bulletin.

[17]  V. Sommer,et al.  Play in chimpanzees of the Arnhem Zoo: Self-serving compromises , 1995, Primates.

[18]  C. Harris.  The Mystery of Ticklish Laughter , 1999, American Scientist.

[19]  D. Croft,et al.  Play behaviour and its effects on social development of common chimpanzees (Pan troglodytes) , 1995, Primates.

[20]  M. Bullowa.  Before Speech: The Beginning of Interpersonal Communication , 1979 .

[21]  Colin Allen,et al.  Intentional Communication and Social Play: How and Why Animals Negotiate and Agree to Play , 1997 .

[22]  M. Bekoff.  Social play and play-soliciting by infant canids , 1974 .

[23]  Signe Preuschoft,et al.  The social function of "smile" and "laughter": Variations across primate species and societies. , 1997 .