Developing a social functional account of laughter

Laughter is ubiquitous, universal, and variable. This article develops a social functional account to explain the many physical forms laughter takes and the many social contexts in which it occurs. In contrast to previous perspectives that emphasize the internal state of the producer or the eliciting context, the current social functional account distinguishes laughter according to the behavioral intentions it conveys and the behavioral response it elicits in the recipient. The general function of human and nonhuman laughter is to signal harmless intentions, and within this function, we identify 3 distinct social tasks accomplished by human laughter. We propose that the first social function of laughter, both evolutionarily and developmentally, is to reward the behavior of others and reinforce the ongoing interaction. The second task accomplished by laughter is the easing of social tension and signaling of affiliation and nonthreat. A third form of laughter nonconfrontationally enforces social norms, negotiates status, and corrects undesirable behavior in others by conveying dominance or superiority. We propose that the acoustic modulations that communicate these social intentions follow principles common to human and nonhuman vocal signaling.