Naturalistic observations of smiling and laughter in human group interactions

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Honest signaling in trust interactions: smiles rated as genuine induce trust and signal higher earning opportunities (2015, background): “Byfilming sixty pairs of friends during a neutral and a sharing decision they observe that significantly more Duchenne smiles are produced during sharing situations, thus situations requiring sharing elicit smiles and laughter (Mehu & Dunbar, 2008).”
Smile Big or Not? Effects of Smile Intensity on Perceptions of Warmth and Competence (2016, background): “Kickstarter creators often promise tangible rewards for those who fund their projects, such as a sample of the product or service being developed (Mollick 2014).”
Emotion and Expression: Naturalistic Studies (2013, background): “Mehu, Grammer, and Dunbar (2007; see also Mehu & Dunbar, 2008) hypothesized that Duchenne smiles are messages of cooperative predispositions to share material resources.”