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Individuals modulate their facial emotion expressions in the presence of other people. Does this social tuning reflect changes in emotional experiences or attempts to communicate emotions to others? Here, “target” participants underwent facial electromyography (EMG) recording while viewing emotion-inducing images, believing they were either visible or not visible to “observer” participants. In Study 1, when targets believed they were visible, they produced greater EMG activity and were more accurately perceived by observers, but did not report accompanying changes in their emotion experience. In Study 2, simultaneous facial EMG recording and fMRI scanning revealed that social tuning of targets’ facial expressions correlated with activity in brain structures associated with mentalizing. These findings speak to long-standing, competing accounts of emotion expression, and suggest that individuals actively tune their facial expressions in social settings to communicate their experiences to others.

Face masks slow the spread of SARS-CoV-2, but it has been unknown whether masks influence how individuals communicate emotion through facial expressions. Masks could influence how accurately—or how quickly—individuals perceive expressions, and how rapidly they accumulate evidence for emotion. Over two independent pre-registered studies, conducted three and six months into the COVID-19 pandemic, participants judged expressions of 6 emotions (anger, disgust, fear, happiness, sadness, surprise) with the lower or upper face “masked” or unmasked. Participants in Study 1 (N = 228) identified expressions above chance with lower face masks. However, they were less likely—and slower—to correctly identify these expressions versus without masks, and they accumulated evidence for emotion more slowly—via decreased drift rate in drift-diffusion modeling. This pattern replicated and intensified three months later in Study 2 (N = 264). These data could inform interventions to promote mask wearing by addressing concerns with emotion communication.

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