A meta-analysis was conducted to compare perceptions of Duchenne smiles, smiles that include activation of the cheek raiser muscle that creates crow's feet around the eyes, with perceptions of non-Duchenne smiles, smiles without cheek raiser activation. In addition to testing the overall effect, moderator analyses were conducted to test how methodological, stimulus-specific and perceiver-specific differences between studies predicted the overall effect size. The meta-analysis found that, overall, Duchenne smiles and people producing Duchenne smiles are rated more positively (i.e., authentic, genuine, real, attractive, trustworthy) than non-Duchenne smiles and people producing non-Duchenne smiles. The difference between Duchenne and non-Duchenne smiles was greater when the stimuli were videos rather than photographs, when smiles were elicited naturally rather than through posing paradigms and when Duchenne and non-Duchenne smiles were not matched for intensity of the lip corner puller in addition to other perceiver and methodological moderators.

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Background Though hypomimia, also called facial masking, is experienced by many people with Parkinson’s disease (PD), little is known about how the experience of this motor impairment relates to their own and their care partners’ (CP) social life and relationship quality. Objective To test if the experience of facial masking relates to social wellbeing in people with PD and their CPs. Method Forty individuals with PD and their CPs rated PD’s difficulty showing facial expression (facial masking), and completed questionnaires about their own social wellbeing and depression. Results PD-reported and CP-reported facial masking of PD were positively correlated with experience of social rejection in both partners, though this relationship was diminished when controlling for depression. CPs’ rating of their partner’s facial masking was negatively associated with enjoyment interacting with their partner. This relationship remained when controlling for CP and PD depression. Conclusions The findings suggest that the experience of facial masking is negatively associated with social wellbeing particularly for the CPs, and especially so for the quality of CPs interpersonal relationship with their partner with PD.