TY - JOUR
T1 - Differential behavioural effects of silent bared teeth display and relaxed open mouth display in chimpanzees (Pan troglodytes)
AU - Waller, Bridget
AU - Dunbar, R.
PY - 2005
Y1 - 2005
N2 - This study examines the behavioural consequences of the silent bared teeth display (SBT) and the relaxed open mouth display (ROM) in the chimpanzee, and discusses functional similarities with smiling and laughing (respectively) in humans. Rates of affinitive behaviour increase (in relation to baseline levels) following SBT, suggesting that SBT is a signal of affinity. ROM is observed primarily during play, and dyadic play bouts are significantly longer when ROM is bidirectional, indicating that it may be a signal of play. Rates of affinitive behaviour also increased after ROM, suggesting that both displays may have a similar ultimate (evolutionary) function – social bonding; this could explain convergence of the two displays in humans.
AB - This study examines the behavioural consequences of the silent bared teeth display (SBT) and the relaxed open mouth display (ROM) in the chimpanzee, and discusses functional similarities with smiling and laughing (respectively) in humans. Rates of affinitive behaviour increase (in relation to baseline levels) following SBT, suggesting that SBT is a signal of affinity. ROM is observed primarily during play, and dyadic play bouts are significantly longer when ROM is bidirectional, indicating that it may be a signal of play. Rates of affinitive behaviour also increased after ROM, suggesting that both displays may have a similar ultimate (evolutionary) function – social bonding; this could explain convergence of the two displays in humans.
U2 - 10.1111/j.1439-0310.2004.01045.x
DO - 10.1111/j.1439-0310.2004.01045.x
M3 - Article
SN - 1439-0310
VL - 111
SP - 129
EP - 142
JO - Ethology
JF - Ethology
IS - 2
ER -
