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Many diverse species yawn, suggesting ancient evolutionary roots. While yawning is widespread, the observation of contagious yawning is most often limited to apes and other mammals with sophisticated social cognition. This has led to speculation on the adaptive value of contagious yawning. Among...
A growing number of studies on non-human animals have documented that stressors modulate the expression of yawning. In particular, recent experimental research shows that yawns are initially inhibited following physical stress, but then become potentiated thereafter. However, stress-induced...
This study tested the hypothesis that human behavioral responses to psychosocial stress are sexually dimorphic and conform to the ‘flight-or-fight’ response for males and ‘tend-and-befriend’ for females. One hundred and twenty young adults (60 male, 60 female), mostly college students, served as...
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